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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 11 — Jun. 2, 2014
  • pp: 13975–13987
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Elliptical Laguerre-Gaussian correlated Schell-model beam

Yahong Chen, Lin Liu, Fei Wang, Chengliang Zhao, and Yangjian Cai  »View Author Affiliations


Optics Express, Vol. 22, Issue 11, pp. 13975-13987 (2014)
http://dx.doi.org/10.1364/OE.22.013975


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Abstract

A new kind of partially coherent beam with non-conventional correlation function named elliptical Laguerre-Gaussian correlated Schell-model (LGCSM) beam is introduced. Analytical propagation formula for an elliptical LGCSM beam passing through a stigmatic ABCD optical system is derived. The elliptical LGCSM beam exhibits unique features on propagation, e.g., its intensity in the far field (or in the focal plane) displays an elliptical ring-shaped beam profile, being qualitatively different from the circular ring-shaped beam profile of the circular LGCSM beam. Furthermore, we carry out experimental generation of an elliptical LGCSM beam with controllable ellipticity, and measure its focusing properties. Our experimental results are consistent with the theoretical predictions. The elliptical LGCSM beam will be useful in atomic optics.

© 2014 Optical Society of America

1. Introduction

On the other hand, it is well-known that ring-shaped beams (also named DH beams) have important applications in free-space optical communications, laser optics, particles trapping, medical sciences, atomic and binary optics [20

20. J. Yin, W. Gao, and Y. Zhu, “Generation of dark hollow beams and their applications,” in Progress in Optics, E. Wolf, ed. (North-Holland, 2003), Vol. 44, pp. 119–204.

32

32. Y. Cai, Z. Wang, and Q. Lin, “An alternative theoretical model for an anomalous hollow beam,” Opt. Express 16(19), 15254–15267 (2008). [CrossRef] [PubMed]

]. Different theoretical models have been proposed to describe various circular DH beams [26

26. T. Kuga, T. Torii, N. Shiokawa, T. Hirano, Y. Shimizu, and H. Sasada, “Novel optical trap of atoms with a doughnut beams,” Phys. Rev. Lett. 78(25), 4713–4716 (1997). [CrossRef]

32

32. Y. Cai, Z. Wang, and Q. Lin, “An alternative theoretical model for an anomalous hollow beam,” Opt. Express 16(19), 15254–15267 (2008). [CrossRef] [PubMed]

]. To describe a DH beam of elliptical symmetry (i.e., elliptical DH beam), several theoretical models have been introduced [33

33. Y. Cai and Q. Lin, “Hollow elliptical Gaussian beam and its propagation through aligned and misaligned paraxial optical systems,” J. Opt. Soc. Am. A 21(6), 1058–1065 (2004). [CrossRef] [PubMed]

36

36. J. C. Gutiérrez-Vega, “Characterization of elliptical dark hollow beams,” Proc. SPIE 7062, 706207 (2008). [CrossRef]

]. Several methods have been developed to generate an elliptical DH beam with the help of triangular prism or elliptical hollow fiber or Mathieu and Bessel functions [37

37. C. Zhao, X. Lu, L. Wang, and H. Chen, “Hollow elliptical Gaussian beams generated by a triangular prism,” Opt. Laser Technol. 40(3), 575–580 (2008). [CrossRef]

39

39. R. Chakraborty and A. Ghosh, “Generation of an elliptical hollow beam using Mathieu and Bessel functions,” J. Opt. Soc. Am. A 23(9), 2278–2282 (2006). [CrossRef]

]. In [40

40. Z. Wang, Q. Lin, and Y. Wang, “Control of atomic rotation by elliptical hollow beam carrying zero angular momentum,” Opt. Commun. 240(4-6), 357–362 (2004). [CrossRef]

], it was found that the elliptical DH beam can be used to control atomic rotation. In [41

41. Y. Cai, H. T. Eyyuboğlu, and Y. Baykal, “Scintillation of astigmatic dark hollow beams in weak atmospheric turbulence,” J. Opt. Soc. Am. A 25, 1497–1503 (2008). [CrossRef]

], it was revealed that an elliptical DH beam displays smaller scintillation than a circular DH beam, a flat-topped beam and a Gaussian beam in turbulent atmosphere. Partially coherent DH beam of circular or elliptical symmetry has also been introduced [42

42. X. Lü and Y. Cai, “Partially coherent circular and elliptical dark hollow beams and their paraxial propagations,” Phys. Lett. A 369(1-2), 157–166 (2007). [CrossRef]

], and experimental generation of a circular partially coherent DH beam with the help of a multimode fiber was reported in [43

43. C. Zhao, Y. Cai, F. Wang, X. Lu, and Y. Wang, “Generation of a high-quality partially coherent dark hollow beam with a multimode fiber,” Opt. Lett. 33(12), 1389–1391 (2008). [CrossRef] [PubMed]

].

As shown in [33

33. Y. Cai and Q. Lin, “Hollow elliptical Gaussian beam and its propagation through aligned and misaligned paraxial optical systems,” J. Opt. Soc. Am. A 21(6), 1058–1065 (2004). [CrossRef] [PubMed]

35

35. Z. Mei and D. Zhao, “Controllable elliptical dark-hollow beams,” J. Opt. Soc. Am. A 23(4), 919–925 (2006). [CrossRef] [PubMed]

], the elliptical DH beam profile of an elliptical DH beam usually disappears in the far field (or in the focal plane). In this paper, we introduce a new kind of partially coherent beam with nonconventional correlation function named elliptical LGCSM beam, which displays elliptical DH beam profile in the far field (or in the focal plane). We derive the analytical propagation formula for an elliptical LGCSM beam passing through a stigmatic ABCD optical system, and study its focusing properties both numerically and experimentally. Some interesting and useful results are found.

2. Ellipitcal Laguerre-Gaussian correlated Schell-model beam: theory

In the space-time domain, the statistical properties of a scalar partially coherent beam are characterized by the mutual coherence function [44

44. L. Mandel and E. Wolf, Optical coherence and quantum optics (Cambridge University, 1995).

]. According to [1

1. F. Gori and M. Santarsiero, “Devising genuine spatial correlation functions,” Opt. Lett. 32(24), 3531–3533 (2007). [CrossRef] [PubMed]

], the mutual coherence function of a partially coherent beam should satisfy the condition of nonnegative definiteness and can be written in the following form
J0(r1,r2)=I(v)H*(r1,v)H(r2,v)d2v,
(1)
where H is an arbitrary kernel, and I is a nonnegative function,r1(x1,y1) and r2(x2,y2) are two arbitrary transverse position vectors. Equation (1) can be expressed in the following alternative form [16

16. F. Wang, X. Liu, Y. Yuan, and Y. Cai, “Experimental generation of partially coherent beams with different complex degrees of coherence,” Opt. Lett. 38(11), 1814–1816 (2013). [CrossRef] [PubMed]

]
J0(r1,r2)=Ji(v1,v2)H*(r1,v1)H(r2,v2)d2v1d2v2,
(2)
where
Ji(v1,v2)=I(v1)I(v2)δ(v1v2).
(3)
One finds from Eqs. (2) and (3) that a partially coherent beam with special correlation function (i.e., special degree of coherence) can be generated from an incoherent source with mutual coherence function Ji(v1,v2) through propagation by choosing suitable expressions of H and I. Here H and I denote the response function of the optical path and the intensity of the incoherent source, respectively.

We set H and I as follows
H(r,v)=iλfT(r)exp[iπλf(v22rv)],
(4)
I(v)=(vx2ω0x2+vy2ω0y2)nexp(2vx2ω0x22vx2ω0y2),
(5)
with
T(r)=exp(r24σ02),
(6)
where H denotes the response function of the optical path which consists of free space with length f, a thin lens with focal length f and a Gaussian amplitude filter with transmission function T (see Fig. 1
Fig. 1 Density plot of the square of the modulus of the degree of coherence of the elliptical LGCSM beam for different values of δ0xand δ0ywith beam order n = 5.
of Ref [16

16. F. Wang, X. Liu, Y. Yuan, and Y. Cai, “Experimental generation of partially coherent beams with different complex degrees of coherence,” Opt. Lett. 38(11), 1814–1816 (2013). [CrossRef] [PubMed]

].), I denotes the intensity of an incoherent elliptical DH beam [33

33. Y. Cai and Q. Lin, “Hollow elliptical Gaussian beam and its propagation through aligned and misaligned paraxial optical systems,” J. Opt. Soc. Am. A 21(6), 1058–1065 (2004). [CrossRef] [PubMed]

] with ω0xand ω0ybeing the beam widths along the x and y directions, respectively.

Substituting Eqs. (4)-(6) into Eqs. (2) and (3), we obtain (after integration) the following expression for a partially coherent beam with special degree of coherence
J0(r1,r2)=G0exp[r12+r224σ02]γ(r1,r2),
(7)
where G0 is a constant which has dimension of an optical intensity, γ(r1,r2)denotes the degree of coherence given by
γ(r2r1)=exp[(x2x1)22δ0x2(y2y1)22δ0y2]Ln0[(x2x1)22δ0x2+(y2y1)22δ0y2],
(8)
where δ0x=λf/πω0x and δ0y=λf/πω0y denote the transverse coherence widths along x and y directions, respectively, Ln0 denotes the Laguerre polynomial of mode order n and 0. We call the partially coherent beam whose mutual coherence function and degree of coherence are given by Eqs. (7) and (8) as elliptical LGCSM beam. Under the condition of n = 0, elliptical LGCSM beam reduces to elliptical GSM beam [16

16. F. Wang, X. Liu, Y. Yuan, and Y. Cai, “Experimental generation of partially coherent beams with different complex degrees of coherence,” Opt. Lett. 38(11), 1814–1816 (2013). [CrossRef] [PubMed]

]. Under the condition of δ0x=δ0y, elliptical LGCSM beam reduces to circular LGCSM beam [15

15. Z. Mei and O. Korotkova, “Random sources generating ring-shaped beams,” Opt. Lett. 38(2), 91–93 (2013). [CrossRef] [PubMed]

, 16

16. F. Wang, X. Liu, Y. Yuan, and Y. Cai, “Experimental generation of partially coherent beams with different complex degrees of coherence,” Opt. Lett. 38(11), 1814–1816 (2013). [CrossRef] [PubMed]

]. Under the condition of δ0x=δ0y and n = 0, elliptical LGCSM beam reduces to circular GSM beam [44

44. L. Mandel and E. Wolf, Optical coherence and quantum optics (Cambridge University, 1995).

]. Figure 1 shows the density plot of the square of the modulus of the degree of coherence of the elliptical LGCSM beam for different values of δ0xand δ0ywith beam order n = 5. One finds from Fig. 1 that the density plot is of elliptical symmetry and the ellipticity is controlled by δ0xand δ0y, which are controlled by the parameters ω0xand ω0yof the incoherent elliptical DH beam. Due to the ellipticity symmetry of the degree of coherence, the newly proposed elliptical LGCSM beam exhibits unique and interesting features on propagation as shown below, although its intensity distribution in the source plane has a circular Gaussian beam profile.

Within the validity of the paraxial approximation, the propagation of the mutual coherence function of an elliptical LGCSM beam through a stigmatic ABCD optical system can be studied with the help of the following extended Collins formula [45

45. S. A. Collins Jr., “Lens-system diffraction integral written in terms ofmatrix optics,” J. Opt. Soc. Am. 60(9), 1168–1177 (1970). [CrossRef]

, 46

46. Q. Lin and Y. Cai, “Tensor ABCD law for partially coherent twisted anisotropic Gaussian-Schell model beams,” Opt. Lett. 27(4), 216–218 (2002). [CrossRef] [PubMed]

]
J(ρ1,ρ2,z)=1(λB)2exp[ikD2B(ρ12ρ22)]×J0(r1,r2)exp[ikA2B(r12r22)]exp[ikB(r1ρ1r2ρ2)]d2r1d2r2,
(9)
where ρ1(ρ1x,ρ1y) and ρ2(ρ2x,ρ2y) represents two arbitrary transverse position vectors in the output plane, A, B, C and D are the elements of a transfer matrix for an optical system, k=2π/λ is the wavenumber withλ being the wavelength.

For the convenience of integration, we introduce the following “sum” and “difference” coordinates
rs=r1+r22,Δr=r1r2,ρs=ρ1+ρ22,Δρ=ρ1ρ2.
(10)
Substituting Eqs. (7), (8) and (10) into Eq. (9), we obtain

J(ρ1,ρ2,z)=G0(λB)2exp[ikDBρsΔρ]×exp[12σ02rs2+(ikABΔr+ikBΔρ)rs]d2rs×exp[18σ02Δr2+ikBρsΔrΔx22δ0x2Δy22δ0y2]Ln0[Δx22δ0x2+Δy22δ0y2]d2Δr.
(11)

After integration over rs, Eq. (11) reduces to

J(ρ1,ρ2,z)=2πG0σ02(λB)2exp[ikDBρsΔρσ022(kB)2(AΔr+Δρ)2]×exp[18σ02Δr2+ikBρsΔrΔx22δ0x2Δy22δ0y2]Ln0[Δx22δ0x2+Δy22δ0y2]d2Δr.
(12)

Applying the following expansion formulae [47

47. M. Abramowitz and I. Stegun, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables (U. S. Department of Commerce, 1970).

]
Ln(x)=p=0n(np)(1)pp!xp,
(13)
(x2+y2)p=m=0p(pm)x2(pm)y2m.
(14)
Equation (12) can be expressed in the following alternative form

J(ρ1,ρ2,z)=2πG0σ02(λB)2exp[ikDBρsΔρ]exp[σ022(kB)2Δρ2]p=0nm=0p(np)(pm)(1)pp!(12δ0x)2(pm)(12δ0y)2mexp[(σ022(AkB)218σ0212δ0x2)Δx2]exp[(σ02(kB)2AΔρ+ikBρs)Δr]exp[(σ022(AkB)218σ0212δ0y2)Δy2]Δx2(pm)Δy2mdΔxdΔy.
(15)

Applying the following integral formula
xnexp[(xβ)2]dx=(2i)nπHn(iβ),
(16)
where Hndenotes the Hermite polynomial of the mode order n, Eq. (15) becomes
J(ρ1,ρ2,z)=2G0π2σ02(λB)2exp[ikDBρsΔρ]exp[σ022(kB)2Δρ2]×p=0nm=0p(np)(pm)(1)pp!(12δ0x)2(pm)(12δ0y)2m×(2i)2paxay(ax)(pm)(ay)mH2(pm)(ibx2ax)H2m(iby2ay)×exp[bx22ax+by22ay],
(17)
where
ax=σ022(AkB)2+18σ02+12δ0x2,ay=σ022(AkB)2+18σ02+12δ0y2,
(18)
bx=(σ02(kB)2AΔρx+ikBρsx),by=(σ02(kB)2AΔρy+ikBρsy).
(19)
Equation (17) represents the mutual coherence function of the elliptical LGCSM beam in the output plane. The average intensity of the elliptical LGCSM beam is given as

I(ρ,z)=J(ρ,ρ,z).
(20)

As a numerical example, we study the focusing properties of an elliptical LGCSM beam by applying the derived formula. We assume that an elliptical LGCSM beam is focused by a thin lens with focal length f located in the source plane. The output plane is located in the geometrical plane. Then the transfer matrix between the source plane and the output plane reads as

(ABCD)=(1f01)(101/f1)=(0f1/f1).
(21)

Applying Eqs. (17)-(21), we calculate in Fig. 2
Fig. 2 Density plot of the intensity distribution of the elliptical LGCSM beam in the geometrical focal plane for different values of δ0xand δ0ywith beam order n = 5.
the density plot of the intensity distribution of an elliptical LGCSM beam in the geometrical focal plane for different values of δ0xand δ0ywith beam order n = 5, λ=632.8nm,f=400mm,σ0=1.0mm. It is interesting to find from Fig. 2 that we can obtain elliptical DH (i.e., elliptical ring-shaped) beam profile in the focal plane, in other words elliptical DH beam profile can be formed in the far field due to the fact that the beam profile of the far-field intensity is equivalent to that in the focal plane. The ellipticity of the elliptical DH beam profile in the focal plane (or in the far field) is controlled by the parameters δ0xand δ0y. Under the condition of δ0x = δ0y, circular DH (i.e. circular ring-shaped) beam profile is formed as expected (see Fig. 2(c)) [15

15. Z. Mei and O. Korotkova, “Random sources generating ring-shaped beams,” Opt. Lett. 38(2), 91–93 (2013). [CrossRef] [PubMed]

,16

16. F. Wang, X. Liu, Y. Yuan, and Y. Cai, “Experimental generation of partially coherent beams with different complex degrees of coherence,” Opt. Lett. 38(11), 1814–1816 (2013). [CrossRef] [PubMed]

]. Thus, modulating the correlation function of a partially coherent beam provides a novel way for generating an elliptical DH beam in the focal plane, which will be useful in atomic optics.

3. Elliptical Laguerre-Gaussian correlated Schell-model beam: experiment

In this section, we report experimental generation of an elliptical LGCSM beam with controllable spatial coherence and ellipticity, and carried out experimental measurement of its intensity in the geometrical focal plane.

Figure 3
Fig. 3 Experimental setup for generating an elliptical LGCSM beam, measuring the square of the modulus of its degree of coherence and its focused intensity. RM, reflecting mirror; BE, beam expander; SLM, spatial light modulator; CA, circular aperture; RGGD, rotating ground-disk; L,L1,L2,L3, thin lenses; GAF, Gaussian amplitude filter; CCD, charge-coupled device; BPA, beam profile analyzer; PC1,PC2, personal computers.
shows our experimental setup for generating an elliptical LGCSM beam, measuring the square of the modulus of its degree of coherence and its focused intensity. Part 1 of Fig. 3 shows the experimental setup for generating an elliptical LGCSM beam with controllable parameters δ0xand δ0y. A beam emitted from a He-Ne laser (λ=632.8nm) is reflected by a reflecting mirror and passes through a beam expander, then it goes towards a spatial light modulator (SLM, Holoeye LC2002), which acts as a phase grating designed by the method of computer-generated holograms. To generate an elliptical DH beam whose intensity is given by Eq. (5), the grating pattern of holograms loaded on the SLM is calculated by the interference of a plane wave and the desired elliptical DH beam. The phase gratings for generating elliptical DH beams (n = 5) of different values of ω0x/ω0yare shown in Fig. 4
Fig. 4 Phase gratings for generating an elliptical DH beams (n = 5) of different values of ω0x/ω0ywithω0x=0.8mm. (a)ω0x/ω0y=0.4, (b)ω0x/ω0y=0.8,(c) ω0x/ω0y=1, (d) ω0x/ω0y=1.2, (e) ω0x/ω0y=2.5.
. When the laser beam illuminates the SLM, diffraction patters appear, and the first-order diffraction pattern can be regarded as an elliptical DH beam and is selected out by a circular aperture. After passing through a thin lens L, the generated elliptical DH beam illuminates the RGGD, producing an incoherent elliptical DH beam. Here L is used to control the beam spot size on the RGGD through varying the distance between L and RGGD. The transmitted beam from the RGGD can be regarded as an incoherent elliptical DH beam if the diameter of the beam spot on the RGGD is larger than the inhomogeneity scale of the RGGD [48

48. P. De Santis, F. Gori, G. Guattari, and C. Palma, “An example of Collet-Wolf source,” Opt. Commun. 29(3), 256–260 (1979). [CrossRef]

], and this condition is satisfied in our experiment. After passing through the thin lens L1 and the GAF, the incoherent elliptical DH beam becomes an elliptical LGCSM beam.

Part 2 of Fig. 3 shows our experiment setup for measuring the degree of coherence of the generated elliptical LGCSM beam. The generated elliptical LGCSM beam from the GAF passes through the thin lens L2with focal lengthf2, and arrives at the charge-coupled device (CCD), which is used to measure the instantaneous intensity. Both distances from GAF to L2 and from L2 to CCD are 2f2(i.e., 2f-imaging system). Thus, the degree of coherence of the beam in the plane of the CCD is the same as that just behind the GAF. The output signal from the CCD is sent to a personal computer to measure the normalized fourth-order correlation function (FOCF) of the beam which is defined as
g(2)(r1,r2)=I(r1,t)I(r2,t)I(r1,t)I(r2,t),
(22)
whereI(r,t)denotes the instantaneous intensity distribution, and the angular brackets denote the ensemble average. With the help of the Gaussian moment theorem [44

44. L. Mandel and E. Wolf, Optical coherence and quantum optics (Cambridge University, 1995).

], the normalized FOCF can be expanded in terms of the degree of coherence as follows
g(2)(r1,r2)=1+|γ(r1,r2)|2.
(23)
In our experiment, the CCD records 2000 pictures totally, and each picture denotes one realization of the beam cross section, the integration time of the CCD for measuring the intensity samples is 20ms. Each realization can be represented by a matrix I(m)(x,y)with x and y being pixel spatial coordinates. Here m denotes each realization and ranges from 1 to 2000. Then the square of the modulus of the degree of coherence of the generated elliptical LGCSM beam is obtained as
|γ(r1,r2=0)|2=1Mm=1MI(m)(x1,y1)I(m)(0,0)I¯(x1,y1)I¯(0,0)1,
(24)
where
I¯(x1,y1)=m=1MI(m)(x1,y1)/M,
(25)
I¯(0,0)=m=1MI(m)(0,0)/M.
(26)
Here I¯(x1,y1) and I¯(0,0)denote the average intensity of all realizations and the average intensity at the central point, respectively.

Part 3 shows our experimental setup for measuring the intensity at the focal plane. The generated elliptical LGSM beam passes through a thin lens L3 with focal length f3=400mm which is located just behind the GAF, then arrives at the beam profile analyzer (BPA), which is used to measure its intensity at the focal plane. The transfer matrix between the GAF and the BPA is given by

(ABCD)=(0f31/f30).
(27)

Figure 5
Fig. 5 Experimental results of (a) the intensity distribution and (b) the corresponding cross line (dotted curve) of the generated elliptical LGCSM beam (n = 5) just behind the GAF. The solid curve is a result of the theoretical fit.
shows our experimental results of the intensity distribution and the corresponding cross line (dotted curve) of the generated elliptical LGCSM beam just behind the GAF. One finds that the generated elliptical LGCSM beam has a Gaussian beam profile in the source plane as expected, and the beam width σ0 is determined by the transmission function of the GAF. Via theoretical fit (solid curve) of the experimental results, we obtain that σ0 is about 1mm in our experiment.

Figure 6
Fig. 6 Experimental results of the square of the modulus of the degree of coherence and the corresponding cross lines (dotted curves) of the generated elliptical LGCSM beam (n = 5) just behind the GAF for different values of coherence widths δ0xand δ0y. The solid curve is a result of the theoretical fit.
shows our experimental results of the square of the modulus of the degree of coherence and the corresponding cross lines (dotted curves) of the generated elliptical LGCSM beam (n = 5) just behind the GAF for different values of coherence widths δ0xand δ0y. One finds that the distribution of the square of the modulus of the degree of coherence of the beam just behind the GAF indeed exhibits elliptical symmetry when δ0xδ0y, and the ellipticity varies as the parameter ω0x/ω0yin Fig. 4 varies. Via theoretical fit (solid curve) of the experimental results, the values of δ0xand δ0yin Fig. 6(a)-(e) are obtained as (a) δ0x=0.2mm,δ0y=0.08mm,(b) δ0x=0.2mm,,δ0y=0.16mm (c) δ0x=δ0y=0.2mm,(d) δ0x=0.2mm, δ0y=0.24mm, (d) δ0x=0.2mm,δ0y=0.5mm,respectively.

Figure 7
Fig. 7 Experimental results of the intensity distribution of the generated elliptical LGCSM beam (n = 5) and the corresponding cross lines in the geometrical focal plane for different values of coherence widths δ0xand δ0y. The solid curves denote the theoretical results calculated by Eqs. (17)-(20) and (27).
shows our experimental results of the intensity distribution and corresponding cross lines (dotted curve) of the generated elliptical LGCSM beam (n = 5) in the geometrical focal plane for different values of coherence widths δ0xand δ0y. For the convenience of comparison, the corresponding theoretical results (solid curves) calculated by Eqs. (17)-(21) are also shown in Fig. 7. One finds that elliptical DH (i.e., elliptical ring-shaped) beam profile indeed is formed in the geometrical focal plane, and the ellipticity is controlled by the values of the parameters δ0xandδ0y, as expected in Fig. 2. Our experimental results agree well with theoretical predictions.

4. Summary

We have introduced a kind of partially coherent beam with nonconventional correlation function named elliptical LGCSM beam as a natural extension of recently introduced circular LGCSM beam. We have derived analytical propagation formula for such beam passing through a stigmatic ABCD optical system. Furthermore, we have reported experimental generation of the newly proposed beam and studied its focusing properties both theoretically and experimentally. We have found that the elliptical LGCSM beam exhibits interesting properties, i.e., its intensity in the focal plane (or in the far field) displays an elliptical DH beam profile, which is quite different from that of a circular LGCSM beam. One can control the ellipticity of the elliptical DH beam profile through varying the initial values of the coherence widths δ0xandδ0y. Thus, our methods provides a novel way for generating elliptical DH beam profile in the focal plane (or in the far field) or for beam shaping. Our results will be useful in atomic optics.

Acknowledgments

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R. Chen, L. Liu, S. Zhu, G. Wu, F. Wang, and Y. Cai, “Statistical properties of a Laguerre-Gaussian Schell-model beam in turbulent atmosphere,” Opt. Express 22(2), 1871–1883 (2014). [CrossRef] [PubMed]

18.

Y. Chen and Y. Cai, “Generation of a controllable optical cage by focusing a Laguerre-Gaussian correlated Schell-model beam,” Opt. Lett. 39(9), 2549–2552 (2014). [CrossRef] [PubMed]

19.

Y. Chen, F. Wang, C. Zhao, and Y. Cai, “Experimental demonstration of a Laguerre-Gaussian correlated Schell-model vortex beam,” Opt. Express 22(5), 5826–5838 (2014). [CrossRef] [PubMed]

20.

J. Yin, W. Gao, and Y. Zhu, “Generation of dark hollow beams and their applications,” in Progress in Optics, E. Wolf, ed. (North-Holland, 2003), Vol. 44, pp. 119–204.

21.

A. D. Mehta, M. Rief, J. A. Spudich, D. A. Smith, and R. M. Simmons, “Single-molecule biomechanics with optical methods,” Science 283(5408), 1689–1695 (1999). [CrossRef] [PubMed]

22.

L. Paterson, M. P. MacDonald, J. Arlt, W. Sibbett, P. E. Bryant, and K. Dholakia, “Controlled rotation of optically trapped microscopic particles,” Science 292(5518), 912–914 (2001). [CrossRef] [PubMed]

23.

M. J. Renn, D. Montgomery, O. Vdovin, D. Z. Anderson, C. E. Wieman, and E. A. Cornell, “Laser-guided atoms in hollow-core optical fibers,” Phys. Rev. Lett. 75(18), 3253–3256 (1995). [CrossRef] [PubMed]

24.

X. Xu, V. G. Minogin, K. Lee, Y. Wang, and W. Jhe, “Guiding cold atoms in a hollow laser beam,” Phys. Rev. A 60(6), 4796–4804 (1999). [CrossRef]

25.

J. Yin, Y. Zhu, W. Jhe, and Y. Wang, “Atom guiding and cooling in a dark hollow laser beam,” Phys. Rev. A 58(1), 509–513 (1998). [CrossRef]

26.

T. Kuga, T. Torii, N. Shiokawa, T. Hirano, Y. Shimizu, and H. Sasada, “Novel optical trap of atoms with a doughnut beams,” Phys. Rev. Lett. 78(25), 4713–4716 (1997). [CrossRef]

27.

F. Gori, G. Guattari, and C. Padovani, “Bessel-Gauss beams,” Opt. Commun. 64(6), 491–495 (1987). [CrossRef]

28.

J. C. Gutiérrez-Vega, M. D. Iturbe-Castillo, and S. Chávez-Cerda, “Alternative formulation for invariant optical fields: Mathieu beams,” Opt. Lett. 25(20), 1493–1495 (2000). [CrossRef] [PubMed]

29.

Y. Cai, X. Lu, and Q. Lin, “Hollow Gaussian beam and its propagation,” Opt. Lett. 28(13), 1084–1086 (2003). [CrossRef] [PubMed]

30.

Z. Mei and D. Zhao, “Controllable dark-hollow beams and their propagation characteristics,” J. Opt. Soc. Am. A 22(9), 1898–1902 (2005). [CrossRef] [PubMed]

31.

Y. Cai, “Model for an anomalous hollow beam and its paraxial propagation,” Opt. Lett. 32(21), 3179–3181 (2007). [CrossRef] [PubMed]

32.

Y. Cai, Z. Wang, and Q. Lin, “An alternative theoretical model for an anomalous hollow beam,” Opt. Express 16(19), 15254–15267 (2008). [CrossRef] [PubMed]

33.

Y. Cai and Q. Lin, “Hollow elliptical Gaussian beam and its propagation through aligned and misaligned paraxial optical systems,” J. Opt. Soc. Am. A 21(6), 1058–1065 (2004). [CrossRef] [PubMed]

34.

Y. Cai and S. He, “Propagation of various dark hollow beams in a turbulent atmosphere,” Opt. Express 14(4), 1353–1367 (2006). [CrossRef] [PubMed]

35.

Z. Mei and D. Zhao, “Controllable elliptical dark-hollow beams,” J. Opt. Soc. Am. A 23(4), 919–925 (2006). [CrossRef] [PubMed]

36.

J. C. Gutiérrez-Vega, “Characterization of elliptical dark hollow beams,” Proc. SPIE 7062, 706207 (2008). [CrossRef]

37.

C. Zhao, X. Lu, L. Wang, and H. Chen, “Hollow elliptical Gaussian beams generated by a triangular prism,” Opt. Laser Technol. 40(3), 575–580 (2008). [CrossRef]

38.

H. Li and J. Yin, “Generation of a vectorial elliptic hollow beam by an elliptic hollow fiber,” Opt. Lett. 36(4), 457–459 (2011). [CrossRef] [PubMed]

39.

R. Chakraborty and A. Ghosh, “Generation of an elliptical hollow beam using Mathieu and Bessel functions,” J. Opt. Soc. Am. A 23(9), 2278–2282 (2006). [CrossRef]

40.

Z. Wang, Q. Lin, and Y. Wang, “Control of atomic rotation by elliptical hollow beam carrying zero angular momentum,” Opt. Commun. 240(4-6), 357–362 (2004). [CrossRef]

41.

Y. Cai, H. T. Eyyuboğlu, and Y. Baykal, “Scintillation of astigmatic dark hollow beams in weak atmospheric turbulence,” J. Opt. Soc. Am. A 25, 1497–1503 (2008). [CrossRef]

42.

X. Lü and Y. Cai, “Partially coherent circular and elliptical dark hollow beams and their paraxial propagations,” Phys. Lett. A 369(1-2), 157–166 (2007). [CrossRef]

43.

C. Zhao, Y. Cai, F. Wang, X. Lu, and Y. Wang, “Generation of a high-quality partially coherent dark hollow beam with a multimode fiber,” Opt. Lett. 33(12), 1389–1391 (2008). [CrossRef] [PubMed]

44.

L. Mandel and E. Wolf, Optical coherence and quantum optics (Cambridge University, 1995).

45.

S. A. Collins Jr., “Lens-system diffraction integral written in terms ofmatrix optics,” J. Opt. Soc. Am. 60(9), 1168–1177 (1970). [CrossRef]

46.

Q. Lin and Y. Cai, “Tensor ABCD law for partially coherent twisted anisotropic Gaussian-Schell model beams,” Opt. Lett. 27(4), 216–218 (2002). [CrossRef] [PubMed]

47.

M. Abramowitz and I. Stegun, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables (U. S. Department of Commerce, 1970).

48.

P. De Santis, F. Gori, G. Guattari, and C. Palma, “An example of Collet-Wolf source,” Opt. Commun. 29(3), 256–260 (1979). [CrossRef]

OCIS Codes
(030.0030) Coherence and statistical optics : Coherence and statistical optics
(140.3300) Lasers and laser optics : Laser beam shaping
(140.7010) Lasers and laser optics : Laser trapping
(350.5500) Other areas of optics : Propagation

ToC Category:
Physical Optics

History
Original Manuscript: April 14, 2014
Manuscript Accepted: May 23, 2014
Published: May 30, 2014

Citation
Yahong Chen, Lin Liu, Fei Wang, Chengliang Zhao, and Yangjian Cai, "Elliptical Laguerre-Gaussian correlated Schell-model beam," Opt. Express 22, 13975-13987 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-11-13975


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References

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  11. Y. Yuan, X. Liu, F. Wang, Y. Chen, Y. Cai, J. Qu, H. T. Eyyuboğlu, “Scintillation index of a multi-Gaussian Schell-model beam in turbulent atmosphere,” Opt. Commun. 305, 57–65 (2013). [CrossRef]
  12. Y. Zhang, L. Liu, C. Zhao, Y. Cai, “Multi-Gaussian Schell-model vortex beam,” Phys. Lett. A 378(9), 750–754 (2014). [CrossRef]
  13. C. Liang, F. Wang, X. Liu, Y. Cai, O. Korotkova, “Experimental generation of cosine-Gaussian-correlated Schell-model beams with rectangular symmetry,” Opt. Lett. 39(4), 769–772 (2014). [CrossRef] [PubMed]
  14. Y. Chen, F. Wang, L. Liu, C. Zhao, Y. Cai, O. Korotkova, “Generation and propagation of a partially coherent vector beam with special correlation functions,” Phys. Rev. A 89(1), 013801 (2014). [CrossRef]
  15. Z. Mei, O. Korotkova, “Random sources generating ring-shaped beams,” Opt. Lett. 38(2), 91–93 (2013). [CrossRef] [PubMed]
  16. F. Wang, X. Liu, Y. Yuan, Y. Cai, “Experimental generation of partially coherent beams with different complex degrees of coherence,” Opt. Lett. 38(11), 1814–1816 (2013). [CrossRef] [PubMed]
  17. R. Chen, L. Liu, S. Zhu, G. Wu, F. Wang, Y. Cai, “Statistical properties of a Laguerre-Gaussian Schell-model beam in turbulent atmosphere,” Opt. Express 22(2), 1871–1883 (2014). [CrossRef] [PubMed]
  18. Y. Chen, Y. Cai, “Generation of a controllable optical cage by focusing a Laguerre-Gaussian correlated Schell-model beam,” Opt. Lett. 39(9), 2549–2552 (2014). [CrossRef] [PubMed]
  19. Y. Chen, F. Wang, C. Zhao, Y. Cai, “Experimental demonstration of a Laguerre-Gaussian correlated Schell-model vortex beam,” Opt. Express 22(5), 5826–5838 (2014). [CrossRef] [PubMed]
  20. J. Yin, W. Gao, and Y. Zhu, “Generation of dark hollow beams and their applications,” in Progress in Optics, E. Wolf, ed. (North-Holland, 2003), Vol. 44, pp. 119–204.
  21. A. D. Mehta, M. Rief, J. A. Spudich, D. A. Smith, R. M. Simmons, “Single-molecule biomechanics with optical methods,” Science 283(5408), 1689–1695 (1999). [CrossRef] [PubMed]
  22. L. Paterson, M. P. MacDonald, J. Arlt, W. Sibbett, P. E. Bryant, K. Dholakia, “Controlled rotation of optically trapped microscopic particles,” Science 292(5518), 912–914 (2001). [CrossRef] [PubMed]
  23. M. J. Renn, D. Montgomery, O. Vdovin, D. Z. Anderson, C. E. Wieman, E. A. Cornell, “Laser-guided atoms in hollow-core optical fibers,” Phys. Rev. Lett. 75(18), 3253–3256 (1995). [CrossRef] [PubMed]
  24. X. Xu, V. G. Minogin, K. Lee, Y. Wang, W. Jhe, “Guiding cold atoms in a hollow laser beam,” Phys. Rev. A 60(6), 4796–4804 (1999). [CrossRef]
  25. J. Yin, Y. Zhu, W. Jhe, Y. Wang, “Atom guiding and cooling in a dark hollow laser beam,” Phys. Rev. A 58(1), 509–513 (1998). [CrossRef]
  26. T. Kuga, T. Torii, N. Shiokawa, T. Hirano, Y. Shimizu, H. Sasada, “Novel optical trap of atoms with a doughnut beams,” Phys. Rev. Lett. 78(25), 4713–4716 (1997). [CrossRef]
  27. F. Gori, G. Guattari, C. Padovani, “Bessel-Gauss beams,” Opt. Commun. 64(6), 491–495 (1987). [CrossRef]
  28. J. C. Gutiérrez-Vega, M. D. Iturbe-Castillo, S. Chávez-Cerda, “Alternative formulation for invariant optical fields: Mathieu beams,” Opt. Lett. 25(20), 1493–1495 (2000). [CrossRef] [PubMed]
  29. Y. Cai, X. Lu, Q. Lin, “Hollow Gaussian beam and its propagation,” Opt. Lett. 28(13), 1084–1086 (2003). [CrossRef] [PubMed]
  30. Z. Mei, D. Zhao, “Controllable dark-hollow beams and their propagation characteristics,” J. Opt. Soc. Am. A 22(9), 1898–1902 (2005). [CrossRef] [PubMed]
  31. Y. Cai, “Model for an anomalous hollow beam and its paraxial propagation,” Opt. Lett. 32(21), 3179–3181 (2007). [CrossRef] [PubMed]
  32. Y. Cai, Z. Wang, Q. Lin, “An alternative theoretical model for an anomalous hollow beam,” Opt. Express 16(19), 15254–15267 (2008). [CrossRef] [PubMed]
  33. Y. Cai, Q. Lin, “Hollow elliptical Gaussian beam and its propagation through aligned and misaligned paraxial optical systems,” J. Opt. Soc. Am. A 21(6), 1058–1065 (2004). [CrossRef] [PubMed]
  34. Y. Cai, S. He, “Propagation of various dark hollow beams in a turbulent atmosphere,” Opt. Express 14(4), 1353–1367 (2006). [CrossRef] [PubMed]
  35. Z. Mei, D. Zhao, “Controllable elliptical dark-hollow beams,” J. Opt. Soc. Am. A 23(4), 919–925 (2006). [CrossRef] [PubMed]
  36. J. C. Gutiérrez-Vega, “Characterization of elliptical dark hollow beams,” Proc. SPIE 7062, 706207 (2008). [CrossRef]
  37. C. Zhao, X. Lu, L. Wang, H. Chen, “Hollow elliptical Gaussian beams generated by a triangular prism,” Opt. Laser Technol. 40(3), 575–580 (2008). [CrossRef]
  38. H. Li, J. Yin, “Generation of a vectorial elliptic hollow beam by an elliptic hollow fiber,” Opt. Lett. 36(4), 457–459 (2011). [CrossRef] [PubMed]
  39. R. Chakraborty, A. Ghosh, “Generation of an elliptical hollow beam using Mathieu and Bessel functions,” J. Opt. Soc. Am. A 23(9), 2278–2282 (2006). [CrossRef]
  40. Z. Wang, Q. Lin, Y. Wang, “Control of atomic rotation by elliptical hollow beam carrying zero angular momentum,” Opt. Commun. 240(4-6), 357–362 (2004). [CrossRef]
  41. Y. Cai, H. T. Eyyuboğlu, Y. Baykal, “Scintillation of astigmatic dark hollow beams in weak atmospheric turbulence,” J. Opt. Soc. Am. A 25, 1497–1503 (2008). [CrossRef]
  42. X. Lü, Y. Cai, “Partially coherent circular and elliptical dark hollow beams and their paraxial propagations,” Phys. Lett. A 369(1-2), 157–166 (2007). [CrossRef]
  43. C. Zhao, Y. Cai, F. Wang, X. Lu, Y. Wang, “Generation of a high-quality partially coherent dark hollow beam with a multimode fiber,” Opt. Lett. 33(12), 1389–1391 (2008). [CrossRef] [PubMed]
  44. L. Mandel and E. Wolf, Optical coherence and quantum optics (Cambridge University, 1995).
  45. S. A. Collins., “Lens-system diffraction integral written in terms ofmatrix optics,” J. Opt. Soc. Am. 60(9), 1168–1177 (1970). [CrossRef]
  46. Q. Lin, Y. Cai, “Tensor ABCD law for partially coherent twisted anisotropic Gaussian-Schell model beams,” Opt. Lett. 27(4), 216–218 (2002). [CrossRef] [PubMed]
  47. M. Abramowitz and I. Stegun, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables (U. S. Department of Commerce, 1970).
  48. P. De Santis, F. Gori, G. Guattari, C. Palma, “An example of Collet-Wolf source,” Opt. Commun. 29(3), 256–260 (1979). [CrossRef]

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