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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 22 — Oct. 29, 2007
  • pp: 14591–14600
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Quantitative Phase Microscopy of microstructures with extended measurement range and correction of chromatic aberrations by multiwavelength digital holography

P. Ferraro, L. Miccio, S. Grilli, M. Paturzo, S. De Nicola, A. Finizio, R. Osellame, and P. Laporta  »View Author Affiliations


Optics Express, Vol. 15, Issue 22, pp. 14591-14600 (2007)
http://dx.doi.org/10.1364/OE.15.014591


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Abstract

Quantitative Phase Microscopy (QPM) by interferometric techniques can require a multiwavelength configuration to remove 2p ambiguity and improve accuracy. However, severe chromatic aberration can affect the resulting phase-contrast map. By means of classical interference microscope configuration it is quite unpractical to correct such aberration. We propose and demonstrate that by Digital Holography (DH) in a microscope configuration it is possible to clear out the QPM map from the chromatic aberration in a simpler and more effective way with respect to other approaches. The proposed method takes benefit of the unique feature of DH to record in a plane out-of-focus and subsequently reconstruct numerically at the right focal image plane. In fact, the main effect of the chromatic aberration is to shift differently the correct focal image plane at each wavelength and this can be readily compensated by adjusting the corresponding reconstruction distance for each wavelength. A procedure is described in order to determine easily the relative focal shift among different imaging wavelengths by performing a scanning of the numerical reconstruction along the optical axis, to find out the focus and to remove at the same time the chromatic aberration.

© 2007 Optical Society of America

1. Introduction

Interferometry often requires an extended range of phase measurement without 2π ambiguity in the phase map due to the long optical path difference (OPD) in the tested sample. In order to overcome this limitation a typical approach is to use a multiwavelength configuration aimed at generating a longer synthetic wavelength for retrieving the phase without ambiguities in an extended range[1–7

01. J. C. Wyant, “Testing aspherics using two-wavelength holography,” Appl. Opt. 10, 2113–2118 (1971). [CrossRef] [PubMed]

]. Of course, the use of multiple wavelengths in the same optical apparatus can lead to the occurrence of severe chromatic aberrations [8

08. M. S. Millán, J. Otón, and E. Pèrez-Cabrè, “Dynamic compensation of chromatic aberration in a programmable diffractive lens,” Opt. Express 14, 9103–9012 (2006). [CrossRef] [PubMed]

]. In standard Optical Coherent Microscopy (OCM) or even Interference Microscopy (IM) [9–12

09. A. Roberts, K. Thorn, M. L. Michna, N. Dragomir, P. Farrel, and G. Baxter, “Determination of bending-induced strain in optical fibers by use of quantitative phase imaging,” Opt. Lett. 27, 86 (2002). [CrossRef]

], the object is imaged by a microscope objective on the plane array of the detector. Different interferograms with different wavelengths can be recorded, but the optical components, in occurrence of chromatic aberration, will image the same object at different planes for each wavelength and, unavoidably, all but one images will result out-of-focus on the detector plane. Depending on the amount of chromatic aberration, the correctness of the phase map, obtained by subtracting two phases corresponding to two different wavelengths will be incorrect since at least one of them will result out-of-focus. Consequently, the final QPM map calculated with the synthetic wavelength will result incorrect. One simple possible solution to this problem would be the mechanical adjustment of the detector (i.e. the movement of the CCD array) or the displacement of the imaging optics to compensate the focal shift of the image plane. One more sophisticated solution will include adaptive focus optics to take into account and compensate the longitudinal shift.

Recently, various holographic techniques have been developed for various applications [13–17

13. L. Xu, X. Peng, J. Miao, and A. K. Asundi, “Studies of digital microscopic holograpy with application to microstructure testing,” Appl. Opt. 40, 5046 (2001). [CrossRef]

] based on digital holography or scanning holography [18

18. P. Picart, J. Leval, F. Piquet, J. P. Boileau, T. Guimezanes, and J. -P. Dalmont, “Tracking high amplitude auto-oscillations with digital Fresnel holograms,” Opt. Express 15, 8263–8274 (2007). [CrossRef] [PubMed]

]. In DH, the imaging procedure is conceptually different. In fact the object wave front, scattered by the sample, is recorded out-of-focus after it interferes with the reference wave. Subsequently, the in-focus image is obtained by a numerical reconstruction of the digital interferogram at the right focus image plane [19

19. G. Indebetouw and W. Zhong, “Scanning holographic microscopy of three-dimensional fluorescent specimens,” J. Opt. Soc. Am. A 23, 1699–1707 (2006) http://www.opticsinfobase.org/abstract.cfm?URI=josaa-23-7-1699 [CrossRef]

, 20

20. S. Grilli, P. Ferraro, S. De Nicola, A. Finizio, G. Pierattini, and R. Meucci, “Whole optical wavefields reconstruction by digital holography,” Opt. Express 9, 294–302 (2001). [CrossRef] [PubMed]

].

This aspect constitutes a very important advantage of DH with respect to the OCM or IM. The flexibility, intrinsically embedded in the DH, consisting in the numerical re-focusing process, offers in fact a very important and useful opportunity to compensate aberrations and remove the errors in the QPM without mechanical adjustment or wavefront correction by means of active devices. Indeed, no mechanical movement is required in DH since the process of focus tuning is fully performed numerically.

Multi-Wavelengths operation in DH has been often required and adopted in various optical configuration for multiplicity of application from biology to MEMS of for 3D color display [22–32

22. M. -K. Kim, “Tomographic three-dimensional imaging of a biological specimen using wavelength-scanning digital interference holography,” Opt. Express 7, 305–310 (2000). [CrossRef] [PubMed]

]. In recent paper it was demonstrated that chromatic aberration was removed by a sort of calibration method [26

26. S. De Nicola, A. Finizio, G. Pierattini, D. Alfieri, S. Grilli, L. Sansone, and P. Ferraro, “Recovering correct phase information in multiwavelength digital holographic microscopy by compensation for chromatic aberrations,” Opt. Lett. 30, 2706–2708 (2005). [CrossRef] [PubMed]

]. However some problems occur in using such method as will be described below.

We illustrate and demonstrate in this paper that a multi-wavelengths phase map can be recovered free of chromatic aberrations by using DH. A procedure is implemented to find the relative focal shift among the various wavelengths by a procedure that we believe can be in practice easily automated, even if investigating the feasibility of such potentiality is out of scope in this paper.

We will show the results obtained for two different types of samples: an in-vitro mouse cell fibroblast and an optical waveguide written by a femto-second laser [33

33. R. Osellame, N. Chiodo, V. Maselli, A. Yin, M. Zavelani-Rossi, G. Cerullo, P. Laporta, L. Aiello, S. De Nicola, P. Ferraro, A. Finizio, and G. Pierattini, “Optical properties of waveguides written by a 26 MHz stretched cavity Ti:sapphire femtosecond oscillator,” Opt. Express 13, 612–620 (2005). [CrossRef] [PubMed]

].

2. Previous approach for removing chromatic aberration in DH and its limitations

In this way a sort of calibration of the holographic set-up allows to compensate for the chromatic aberration once and for all. However, even if this procedure in general works properly, it presents some drawbacks such as a fourfold recording that implies a higher computational load and higher noise, owing to multiple subtractions. Moreover, in some cases sample removal to record reference hologram (i.e. dynamic processes) is not possible or practical.

In the following we describe a novel approach that allows to retrieve the phase map with an extended OPD range using only two holograms at two different wavelengths overcoming all the limitations described above.

3. Description of the optical set-up

Figure 1 illustrates the DH off-axis set-up adopted for recording MWDH holograms. The setup is based on a Mach-Zehnder interferometer in transmission geometry. The off-axis configuration allows one to avoid the problem of the twin image and to eliminate the zero order diffraction. Two lasers with different wavelengths are used, a laser emitting in the green region at λ 1 = 532 nm and the other in the red region at λ 2 = 632.8 nm. The optical configuration is arranged to allow the two lasers to propagate almost along the same paths either for reference and object beams that are plane waves obtained by a beam expander (BE). The first beam splitter is a cube polarizing beam splitter (PBS) and a λ/2 wave plate is inserted in the reference beam to obtain equal polarization direction for the two beams. The microscope objective (MO) is an achromat objective (20× Olympus UMPlanFI) with N.A.=0.46. Two objects are investigated: an in-vitro mouse cell and an optical waveguide. The CCD array has 1024 × 1024 square pixels with a pixel size Δξ = 6.7 μm.

Fig. 1. DH off-axis set-up with two wavelengths. M=mirror; BS= beam splitter; S= sample

4. New approach based on correct distance tracking for removing chromatic aberration in DH

4.1 Description and demonstration of the method

In order to obtain a good superposition of the reconstructed phase-contrast images at different wavelengths, one has to take into account the different curvatures of the wavefronts due to the different wavelengths and the presence of chromatic aberrations due to the optical elements in the setup. Chromatic aberration involves a difference in the magnification and consequently a longitudinal shift of the image plane position on the optical axis as shown in Fig. 2.

Let D be the distance between the CCD and the imaging lens and dG the image plane distance for the green wavelength λG, then the reconstruction distance measured backward from the CCD plane is rG =∣D - dG∣. After reconstruction of the complex field at distance rG we obtain the total phase

φG(x,y)=φ0(xMG,yMG)+πλG(1+1MG)x2+y2DdG
(1)

φG(n,m)=φ0(nΔxGMG,mΔxGMG)+πλG(1+1MG)n2+m2DdGΔxG2
(2)

where the reconstruction pixel at wavelength λG is

ΔxG=ΔyG=λG(DdG)NGΔξ
(3)

where Δξ is the CCD pixel dimension and NG the number of pixels employed in the reconstructions. For the red wavelength λR we have correspondingly:

φR(n,m)=φ0(nΔxRMR,mΔxRMR)+πλR(1+1MR)n2+m2DdRΔxR2
(4)

where dR = dG + ΔdG is the position of the image plane at red wavelength which differs form that of the green wavelength by a quantity ΔdG and the corresponding reconstruction pixel is

ΔxR=ΔyR=λR(DdR)NRΔξ
(5)
Fig. 2. Image plane shift due to chromatic aberration.

Both phases, in Eqs. (2) and (4), are expressed as the summation of two terms. The first one takes into account the phase retardation owing to the sample while the second one regards the optical wave propagation from the imaging lens to the image plane.

To get the phase map for the equivalent wavelength we subtract the foregoing phase maps:

Δφ=φRφG=(φ0,Rφ0,G)+Δφr
(6)

The residual phase, Δφr, is a parabolic term that never cancels out and invalidates the difference phase map by the presence of circular fringes. However, Δφr can be minimized to get a difference phase map without circular fringes. The method is first applied on a test object of known magnifications and image plane positions at both wavelengths. Test object consists of a transparent glass plate with an opaque ruler on it, the distance between 5 ruler lines is of 50μm.

Fig. 3. Difference phase map of the test object: the reconstruction distance for green wavelength is d=105mm, while for red wavelength is (a) d=105mmí; (b) d=114mm; (c) d=120mm. (d) The residual phase corresponding to (c) is reported as Δφr/2π

We reconstruct the two phase maps in their own image plane and, before subtracting them, we make a padding operation taking into account different magnifications distances and wavelengths; in particular, we set

ΔxGMG=ΔxGMR.
(7)

Equation (7) assures that the reconstruction pixel size is the same for both wavelengths and that the residual phase has a minimum. Figure 3(a) shows the difference phase map obtained recovering the complex wavefront for both wavelengths on the same plane, which is the image plane for the green wavelength (d= 105mm); to subtract the phase maps a padding operation has been applied taking into account only the difference in wavelengths. The difference phase map is affected by circular fringes. Noise around the image is present because of the number of pixels in the in reconstruction plane is smaller than 512. The number of pixel in the reconstruction plane are 230 and, taking into account of the reconstruction pixel size of 16,3μm, the field of view is 3,7mm. In Fig. 3(b) red and green phase maps are reconstructed each in its own image plane and then subtracted taking into account Eq. (7). Circular fringes are not visible. Fig. 3(c) shows the difference phase map where the green QPM is reconstructed on the image plane while the red QPM is recovered in a plane beyond the red and green image planes. The padding operation made in this reconstruction takes into account the different wavelengths and distances but not the magnifications and therefore, even in this case, circular fringes are present.

A numerical simulation of the residual phase Δφr has been carried out and in Fig. 3(d) the quantity Δφr/ is reported. This evaluation refers to the case shown in Fig. 3(b) according to Eqs. (2) and (4). The maximum value for Δφr/ is 20% on the edge of the matrix (500×500 pixels), while it is about 10% in the area taken by the object, which is about 300×300 pixels in the matrix center.

The method described can be used as a rapid, even if approximate, graphical technique to find the reconstruction distance for one or more wavelengths (i.e. green and red, in this case) provided that the reconstruction distance for another wavelength (blue, for example) is known. This graphical technique is applied to an in-vitro mouse cell and an optical waveguide, as illustrated in Figs. 4 and 5, respectively.

4.2Experimental results: in-vitro mouse cell

The object in this case can be considered as pure phase object. The purpose of the investigation is the measurement of the QPM for in-vitro mouse cell. Physical dimension of the cell is about 25μm in the x - y plane. In Fig. 4 is shown the QPM map of the in-vitro cell as it appears at λ 12 = λ 1 λ 2/∣λ 1 - λ 2∣ when the two maps are reconstructed at the same distance of 110mm. It is clear, from the superimposed fringes, that a longitudinal shift exists between the two reconstructed images. These fringes are due to the residual phase factor that is the result of the chromatic aberration and different wave front curvature.

Fig. 4. Difference phase map for the in-vitro mouse cell. The reconstruction distance for blue wavelength is fixed at d=110mm while the reconstruction distance for red wavelength is (a) d=110mm and (b) d=114mm; (c) (2,39 MB) Movie of the difference phase map for the in vitro mouse cell while the reconstruction distance of red wavelength is varied from 90mm to 120mm [Media 1]

If the correct reconstruction distance is known for one wavelength the focus shift can be easily tracked and found automatically by scanning the reconstruction distance. By applying the proposed procedure by scanning the focus of the blue reconstruction across the red we found that the fringes due to the chromatic aberration can be effectively nulled as shown in the movie in Fig. 4(c), where the phase-difference is obtained by subtracting the phase map of the red hologram reconstructed at the fixed distance of 110 mm, while the blue hologram is reconstructed at various distances from 90mm to 120mm. The cell is cleared of aberration fringes at the distance of 114mm, i.e 4 mm further than the red hologram.

The phase retardation introduced by the cell is about 5.2 rad in the image plane, we have estimated that a slight difference (∼4mm) in the reconstruction distance for the red wavelength implies a difference in the phase map of about 0.5 rad across the edges of the cell where the defocus produces blurring Such difference is reported in Fig. 5. That demonstrates to have an accurate Quantitative Phase Map it is necessary to have reconstruction at right distance for each wavelength.

Fig. 5. Difference between two phase maps evaluated in slightly distant planes for the same wavelength.

4.3Experimental results: refractive index profile of an optical waveguide

We apply our method to an optical waveguide written using femtosecond laser pulses in a borosilicate glass substrate [31

31. J. Kühn, T. Colomb, F. Montfort, F. Charrière, Y. Emery, E. Cuche, P. Marquet, and C. Depeursinge, “Real-time dual-wavelength digital holographic microscopy with a single hologram acquisition,” Opt. Express. 15, 7231–7242 (2007). [CrossRef] [PubMed]

]. The optical waveguide has a diameter of about 10μm. The best focus was established for the green wavelength, and the red wavelength focus was scanned back and forth with a step size of 5mm. Two frames and a movie of the scanning procedure are reported, respectively, in Figs. 6(a), 6(b) and Fig. 6(c).

Fig. 6. Difference phase map between red and green wavelength; the reconstruction distance for green wavelength is d = 85mm, reconstruction distance for red wavelength is d = 85 mm (a) and d = 110mm (b); (c) (319 KB) Movie of the difference phase map for the optical waveguide [Media 2]

The purpose of the measurement is the retrieval of the refractive index change induced by the femtosecond pulses. The expected refractive index change is about 10-2 and considering a thickness of the glass sample of 275μm, it was necessary to use MWDH configuration to avoid 2π ambiguity. The laser wavelengths used are λ 1 = 532 nm and λ 2 = 632.8 nm.

Figure 7 shows 2D and 3D representation of the refractive index obtained using the equivalent synthetic wavelength corresponding to 3.3μm after removal of the chromatic aberration.

Fig. 7. Refractive index change calculated using an equivalent wavelength: (a) 2D and (b) 3D representation.

Conclusions

DH makes it possible to obtain an extended OPD by means of QPM using an equivalent wavelength. The use of two or more wavelengths has some drawbacks in the reconstruction process, such as the presence of circular fringes on the phase maps owing to the combined effect of different wavefront curvatures and chromatic aberration in to the optical set-up. We have demonstrated a method that minimizes this combined effect and retrieves phase maps without circular fringes. The method can be easily applied thanks to the DH feature of numerical re-focusing. Our procedure can be employed to find automatically the right reconstruction distances for different wavelengths.

The procedure allows the application of MWDH in such cases where an extended measurement range is desired while maintaining interferometric resolution.

References and links

01.

J. C. Wyant, “Testing aspherics using two-wavelength holography,” Appl. Opt. 10, 2113–2118 (1971). [CrossRef] [PubMed]

02.

C. Polhemus, “Two-wavelength interferometry,” Appl. Opt. 12, 2071–2074 (1973). [CrossRef] [PubMed]

03.

F. Bien, M. Camac, H. J. Caulfield, and S. Ezekiel, “Absolute distance measurements by variable wavelength interferometry,” Appl. Opt. 20, 400–402 (1981). [CrossRef] [PubMed]

04.

R. Onodera and Y. Ishii, “Two-wavelength interferometry that uses a fourier-transform method,” Appl. Opt. 37, 7988–7994 (1998). [CrossRef]

05.

P. de Groot and S. Kishner, “Synthetic wavelength stabilization for two-color laser-diode interferometry,” Appl. Opt. 30, 4026–4033 (1991). [CrossRef] [PubMed]

06.

R. Dändliker, R. Thalmann, and D. Pronguè, “Two-wavelength laser interferometry using superheterodyne detection,” Opt. Lett. 13, 339–341 (1988). [CrossRef] [PubMed]

07.

C. Wagner, W. Osten, and S. Seebacher, “Direct shape measurement by digital wavefront reconstruction and multiwavelength contouring,” Opt. Eng. 39, 79–85 (2000). [CrossRef]

08.

M. S. Millán, J. Otón, and E. Pèrez-Cabrè, “Dynamic compensation of chromatic aberration in a programmable diffractive lens,” Opt. Express 14, 9103–9012 (2006). [CrossRef] [PubMed]

09.

A. Roberts, K. Thorn, M. L. Michna, N. Dragomir, P. Farrel, and G. Baxter, “Determination of bending-induced strain in optical fibers by use of quantitative phase imaging,” Opt. Lett. 27, 86 (2002). [CrossRef]

10.

T. Ikeda, G. Popescu, R. R. Dasari, and M. S. Feld, “Hilbert phase microscopy for investigating fast dynamics in transparent systems,” Opt. Lett. 30, 1165–1167 (2005). [CrossRef] [PubMed]

11.

C. Joo, T. Akkin, B. Cense, B. H. Park, and J. F. de Boer, “Spectral-domain optical coherence phase microscopy for quantitative phase-contrast imaging,” Opt. Lett. 30, 2131 (2005). [CrossRef] [PubMed]

12.

C. Fang-Yen, S. Oh, Y. Park, W. Choi, S. Song, H. S. Seung, R. R. Dasari, and M. S. Feld, “Imaging voltage-dependent cell motions with heterodyne Mach-Zehnder phase microscopy,” Opt. Lett. 32, 1572–1574 (2007). [CrossRef] [PubMed]

13.

L. Xu, X. Peng, J. Miao, and A. K. Asundi, “Studies of digital microscopic holograpy with application to microstructure testing,” Appl. Opt. 40, 5046 (2001). [CrossRef]

14.

F. Charrière, A. Marian, F. Montfort, J. Kuehn, T. Colomb, E. Cuche, P. Marquet, and C. Depeursinge, “Cell refractive index tomography by digital holographic microscopy,” Opt. Lett. 31, 178–180 (2006). [CrossRef] [PubMed]

15.

B. Javidi, I. Moon, S. Yeom, and E. Carapezza, “Three-dimensional imaging and recognition of microorganism using single-exposure on-line (SEOL) digital holography,” Opt. Express 13, 4492 (2005). [CrossRef] [PubMed]

16.

A. T. Saucedo, F. M. Santoyo, M. D. l. Torre-Ibarra, G. Pedrini, and W. Osten, “Endoscopic pulsed digital holography for 3d measurements,” Opt. Lett. 14, 1468–1475 (2006).

17.

J. Garcia-Sucerquia, W. Xu, M, H. Jerico, and H. J. Kreuzer, “Immersion digital in-line holographic microscopy,” Opt. Lett. 31, 1211–1213 (2006). [CrossRef] [PubMed]

18.

P. Picart, J. Leval, F. Piquet, J. P. Boileau, T. Guimezanes, and J. -P. Dalmont, “Tracking high amplitude auto-oscillations with digital Fresnel holograms,” Opt. Express 15, 8263–8274 (2007). [CrossRef] [PubMed]

19.

G. Indebetouw and W. Zhong, “Scanning holographic microscopy of three-dimensional fluorescent specimens,” J. Opt. Soc. Am. A 23, 1699–1707 (2006) http://www.opticsinfobase.org/abstract.cfm?URI=josaa-23-7-1699 [CrossRef]

20.

S. Grilli, P. Ferraro, S. De Nicola, A. Finizio, G. Pierattini, and R. Meucci, “Whole optical wavefields reconstruction by digital holography,” Opt. Express 9, 294–302 (2001). [CrossRef] [PubMed]

21.

F. Dubois, C. Schockaert, N. Callens, and C. Yourassowsky, “Focus plane detection criteria in digital holography microscopy by amplitude analysis,” Opt. Express. 14, 5895–5908 (2006). [CrossRef] [PubMed]

22.

M. -K. Kim, “Tomographic three-dimensional imaging of a biological specimen using wavelength-scanning digital interference holography,” Opt. Express 7, 305–310 (2000). [CrossRef] [PubMed]

23.

N. Demoli, D. Vukicevic, and M. Torzynski, “Dynamic digital holographic interferometry with three wavelengths,” Opt. Express 11, 767–774 (2003). [CrossRef] [PubMed]

24.

P. Ferraro, S. De Nicola, G. Coppola, A. Finizio, D. Alfieri, and G. Pierattini, “Controlling image size as a function of distance and wavelength in Fresnel-transform reconstruction of digital holograms,” Opt. Lett. 29, 854–856 (2004). [CrossRef] [PubMed]

25.

B. Javidi, P. Ferraro, S. -H. Hong, S. De Nicola, A. Finizio, D. Alfieri, and G. Pierattini, “Three-dimensional image fusion by use of multiwavelength digital holography,” Opt. Lett. 30, 144–146 (2005). [CrossRef] [PubMed]

26.

S. De Nicola, A. Finizio, G. Pierattini, D. Alfieri, S. Grilli, L. Sansone, and P. Ferraro, “Recovering correct phase information in multiwavelength digital holographic microscopy by compensation for chromatic aberrations,” Opt. Lett. 30, 2706–2708 (2005). [CrossRef] [PubMed]

27.

D. Parshall and M. Kim, “Digital holographic microscopy with dual wavelength phase unwrapping,” Appl. Opt. 45, 451–459 (2006). [CrossRef] [PubMed]

28.

L. Yu and M. K. Kim, “Wavelength-scanning digital interference holography for tomographic three-dimensional imaging by use of the angular spectrum method,” Opt. Lett. 30, 2092–2094 (2005) [CrossRef] [PubMed]

29.

F. Montfort, T. Colomb, F. Charrière, J. Kühn, P. Marquet, E. Cuche, S. Herminjard, and C. Depeursinge, “Submicrometer optical tomography by multiple-wavelength digital holographic microscopy,” Appl. Opt. 45, 8209–8217 (2006) [CrossRef] [PubMed]

30.

Yamaguchi, T. Matsumura, and J. Kato, “Phase-shifting color digital holography,” Opt. Lett. 27, 1108–1110 (2002). [CrossRef]

31.

J. Kühn, T. Colomb, F. Montfort, F. Charrière, Y. Emery, E. Cuche, P. Marquet, and C. Depeursinge, “Real-time dual-wavelength digital holographic microscopy with a single hologram acquisition,” Opt. Express. 15, 7231–7242 (2007). [CrossRef] [PubMed]

32.

P. Ferraro, G. Coppola, S. De Nicola, A. Finizio, and G. Pierattini, “Digital holographic microscope with automatic focus tracking by detecting sample displacement in real time,” Opt. Lett. 28, 1257–1259 (2003). [CrossRef] [PubMed]

33.

R. Osellame, N. Chiodo, V. Maselli, A. Yin, M. Zavelani-Rossi, G. Cerullo, P. Laporta, L. Aiello, S. De Nicola, P. Ferraro, A. Finizio, and G. Pierattini, “Optical properties of waveguides written by a 26 MHz stretched cavity Ti:sapphire femtosecond oscillator,” Opt. Express 13, 612–620 (2005). [CrossRef] [PubMed]

OCIS Codes
(070.4560) Fourier optics and signal processing : Data processing by optical means
(090.1000) Holography : Aberration compensation
(090.2880) Holography : Holographic interferometry

ToC Category:
Holography

History
Original Manuscript: July 23, 2007
Revised Manuscript: September 7, 2007
Manuscript Accepted: September 12, 2007
Published: October 19, 2007

Virtual Issues
Vol. 2, Iss. 11 Virtual Journal for Biomedical Optics

Citation
P. Ferraro, L. Miccio, S. Grilli, M. Paturzo, S. De Nicola, A. Finizio, R. Osellame, and P. Laporta, "Quantitative Phase Microscopy of microstructures with extended measurement range and correction of chromatic aberrations by multiwavelength digital holography," Opt. Express 15, 14591-14600 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-22-14591


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References

  1. J. C.  Wyant, "Testing aspherics using two-wavelength holography," Appl. Opt. 10, 2113-2118 (1971). [CrossRef] [PubMed]
  2. C.  Polhemus, "Two-wavelength interferometry," Appl. Opt.  12, 2071-2074 (1973). [CrossRef] [PubMed]
  3. F.  Bien, M.  Camac, H. J.  Caulfield, and S.  Ezekiel, "Absolute distance measurements by variable wavelength interferometry," Appl. Opt.  20, 400-402 (1981). [CrossRef] [PubMed]
  4. R.  Onodera and Y.  Ishii, "Two-wavelength interferometry that uses a fourier-transform method," Appl. Opt.  37, 7988-7994 (1998). [CrossRef]
  5. P.  de Groot and S.  Kishner, "Synthetic wavelength stabilization for two-color laser-diode interferometry," Appl. Opt.  30, 4026-4033 (1991). [CrossRef] [PubMed]
  6. R.  Dändliker, R.  Thalmann, and D.  Prongué, "Two-wavelength laser interferometry using superheterodyne detection," Opt. Lett.  13, 339-341 (1988). [CrossRef] [PubMed]
  7. C.  Wagner, W.  Osten, and S.  Seebacher, "Direct shape measurement by digital wavefront reconstruction and multiwavelength contouring," Opt. Eng. 39, 79-85 (2000). [CrossRef]
  8. M. S. Millán, J. Otón, and E. Pérez-Cabré, "Dynamic compensation of chromatic aberration in a programmable diffractive lens," Opt. Express 14, 9103-9012 (2006). [CrossRef] [PubMed]
  9. A. Roberts, K. Thorn, M. L. Michna, N. Dragomir, P. Farrel, and G. Baxter, "Determination of bending-induced strain in optical fibers by use of quantitative phase imaging," Opt. Lett. 27, 86 (2002). [CrossRef]
  10. T. Ikeda, G. Popescu, R. R. Dasari, and M. S. Feld, "Hilbert phase microscopy for investigating fast dynamics in transparent systems," Opt. Lett. 30, 1165-1167 (2005). [CrossRef] [PubMed]
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