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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 7 — Jul. 1, 2012
  • pp: 1772–1777
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Unified theoretical model for calculating laser-induced wavefront distortion in optical materials

Luis C. Malacarne, Nelson G. C. Astrath, and Mauro L. Baesso  »View Author Affiliations


JOSA B, Vol. 29, Issue 7, pp. 1772-1777 (2012)
http://dx.doi.org/10.1364/JOSAB.29.001772


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Abstract

Laser-induced thermal lens in optical components causes wavefront distortion of the laser beam and may affect performance and stability of optical systems such as high-power lasers. The bulging of the heated area, the temperature dependence of the refractive index, and the photoelastic effects are responsible for phase shifts damaging beam quality. The theoretical background for laser-induced beam distortion is well understood and applies only for axially symmetric thermal loadings, with the assumptions that the stresses follow thin-disk or long-rod approximations. This, in fact, limits the overall applications of this model. In this work, we developed an unified theoretical model for the optical path change in optical materials regardless of its thickness. The modeling is based on the solution of the thermoelastic equation and has a real description of the surface deformation caused in the optical element. In the appropriated limits, as expected, the model retrieves the thin-disk and the long-rod type distributions. Furthermore, we provided time-dependent radial expressions for the temperature, surface displacement, and stresses. The theory presented in this paper provides simple analytical tools for designing laser systems, and complements previous work allowing one to access optical distortions of materials ranging from thin-disk to long-rod-like distributions.

© 2012 Optical Society of America

Wavefront distortion arising from thermal lens in optical materials poses a major problem in high-power laser systems and has been subject to exhaustive investigation over the past few decades [1

1. C. Zhao, J. Degallaix, L. Ju, Y. Fan, D. G. Blair, B. J. J. Slagmolen, M. B. Gray, C. M. Mow Lowry, D. E. McClelland, D. J. Hosken, D. Mudge, A. Brooks, J. Munch, P. J. Veitch, M. A. Barton, and G. Billingsley, “Compensation of strong thermal lensing in high-optical-power cavities,” Phys. Rev. Lett. 96, 231101(2006). [CrossRef]

9

9. W. Koechner and M. Bass, Solid-State Lasers: A Graduate Text (Springer, 2003).

]. In such optical components, nonuniform heating caused by the laser beam absorption compromises the system’s performance affecting the optical quality of the beam [1

1. C. Zhao, J. Degallaix, L. Ju, Y. Fan, D. G. Blair, B. J. J. Slagmolen, M. B. Gray, C. M. Mow Lowry, D. E. McClelland, D. J. Hosken, D. Mudge, A. Brooks, J. Munch, P. J. Veitch, M. A. Barton, and G. Billingsley, “Compensation of strong thermal lensing in high-optical-power cavities,” Phys. Rev. Lett. 96, 231101(2006). [CrossRef]

,2

2. W. Winkler, K. Danzmann, A. Rüdiger, and R. Schilling, “Heating bu optical absorption and the performance of interferometric gravitational-wave detectors,” Phys. Rev. A 44, 7022–7036 (1991). [CrossRef]

]. This effect has been mostly investigated regarding phase shift induced in optical windows. Particularly for windows, the wavefront distortion originates from the refractive index gradient thermally induced in addition to the thermoelastic deformation of the windows surface.

For an axial symmetric beam propagating along the z direction, the optical path is defined as
S(r,t)=pathn(r,z,t)dz.
(1)
We consider here a low optical absorption material of thickness l0 (path length) and refractive index ns(r,z,t) centered in z=0, as shown in Fig. 1. The material is surrounded by a nonabsorbing fluid medium of refractive index nf(r,z,t). The optical path length can be then written as
S(r,t)=20b(r,t)ns(r,z,t)dz+2b(r,t)znf(r,z¯,t)dz¯,
(2)
where b(r,t)=(l0+Δl)/2 and
Δl=2|uz(r+ur,l0/2,t)|2|uz(r,l0/2,t)|.
(3)
ui are the laser-induced thermoelastic displacement components [13

13. N. G. C. Astrath, L. C. Malacarne, P. R. B. Pedreira, A. C. Bento, M. L. Baesso, and J. Shen, “Time-resolved thermal mirror for nanoscale surface displacement detection in low absorbing solids,” Appl. Phys. Lett. 91, 191908 (2007). [CrossRef]

,14

14. F. Sato, L. C. Malacarne, P. R. B. Pedreira, M. P. Belancon, R. S. Mendes, M. L. Baesso, N. G. C. Astrath, and J. Shen, “Time-resolved thermal mirror method: A theoretical study,” J. Appl. Phys. 104, 053520 (2008). [CrossRef]

]. We define n(r,z,t)=n0+Δn, and with regard to the change in index, Δn, we must consider not only the temperature dependence (Δnth) but also the stress induced thermoelastic effect (Δnst) as [4

4. C. A. Klein, “Optical distortion coefficients of high-power laser windows,” Opt. Eng. 29, 343–350 (1990). [CrossRef]

]
Δn=Δnth+Δnst.
(4)
Note that uzl0. Using the linear transformation z(zl0/2), the optical path length results in five contributions:
S(r,t)=S0+Sthf(r,t)+Sths(r,t)+Sst(r,t)+Sexp(r,t),
(5)
where S0 is the optical path before heating; Sths,f(r,t) are the contributions from temperature index variations caused in the sample (s) and in the fluid (f); Sst(r,t) is the contribution from thermal stress; and Sexp(r,t) is the contribution from thermoelastic expansion.

Fig. 1. Schematic diagram of the optical element geometry.

In a first approximation, the thermal effects on the refractive index can be easily formulated as linearly dependent over the temperature range of interest as
Δnthi=(niT)thTi(r,z,t).
(6)
(ni/T)th is the thermo-optic coefficient as measured at the reference temperature for the sample (i=s) or for the fluid (i=f). Ti(r,z,t) is the laser-induced temperature rise distribution. In this approximation, we may write
Sthf(r,t)=2(nfT)thl0zTf(r,z¯,t)dz¯,
(7)
and
Sths(r,t)=(nsT)th0l0Ts(r,z,t)dz.
(8)

The thermal stress index variation involves considerations relating to the thermoelastic effect and applies only to the sample as
Δnsts=12(n0s)3[qσrr+q(σϕϕ+σzz)],
(9)
for plane waves polarized along the radial direction, and
Δnsts=12(n0s)3[qσϕϕ+q(σrr+σzz)]
(10)
for azimuthal polarizations. q and q refer to the stress-optic coefficients for stresses applied parallel and perpendicular to the polarization axis, respectively. σij are the stress tensor components. From Eqs. (9) and (10), we can introduce the symmetric and antisymmetric combinations of the radial and azimuthal aberrations [4

4. C. A. Klein, “Optical distortion coefficients of high-power laser windows,” Opt. Eng. 29, 343–350 (1990). [CrossRef]

], as
Sst(r,t)=Sst+(r,t)+Sst(r,t)
(11)
with
Sst+(r,t)=(n0s)340l0[(q+q)(σrr+σϕϕ)+2qσzz]dz,
(12)
Sst(r,t)=(n0s)340l0[(qq)(σrrσϕϕ)]dz.
(13)
Sst+(r,t) represents the averaged medium’s sensitivity to thermal lens. It combines the laser-induced change in index, and the contribution from bulging and photoelastic effect for the two polarizations. Sst(r,t) contributes only if the medium is stress-birefringent.

Finally, the contribution originated from the surface deformation yields
Sexp(r,t)=(n0sn0f)Δl(r,z,t)|z=0.
(14)

Terms of second order proportional to the product ΔnΔl are neglected here. The above expressions show us that the optical path change induced by the laser beam is a result of thermal, stress, and strain effects. This complex problem could be simplified under approximative assumptions. For instance, if the beam radius is smaller than the radial dimension of the sample, for a relative short exposure time t, the temperature at the edges of the sample can be assumed constant. Moreover, if air is used as fluid, which is basically the case for optical windows in laser systems, n0f1, and the approximation of no heat flow across the interface material/fluid is valid [15

15. L. C. Malacarne, N. G. C. Astrath, G. V. B. Lukasievcz, E. K. Lenzi, M. L. Baesso, and S. E. Bialkowski, “Time-resolved thermal lens and thermal mirror spectroscopy with sample-fluid heat coupling: A complete model for material characterization,” Appl. Spectrosc. 65, 99–104 (2011). [CrossRef]

]. Thus, the fluid contribution Sthf(r,t) can be safely neglected—and will be omitted from this point.

We consider the case of a continuous wave incident beam with a Gaussian TEM00 intensity profile. It is assumed that the attenuation of light intensity along the material thickness can be neglected—low optical absorption approximation. Thus, the temperature rise distribution with no axial heat flow to the surroundings is given by the solution of the following heat conduction differential equation [16

16. H. S. Carslaw and J. C. Jaeger, Conduction of Heat in Solids (Clarendon Press, 1959), Vol. 1, p. 78.

]:
tT(r,z,t)kcρ2T(r,z,t)=Q0e2r2ω2,
(15)
with the initial condition T(r,z,0)=0 and boundary conditions T(,z,t)=0 and T(r,z,t)/z|z=0=0. c, ρ, and k are specific heat, mass density, and thermal conductivity of the material, respectively. Q0=2P0(1R)A/(ρcπω2), A is the optical absorption coefficient at the laser beam wavelength, R, P0, and ω are the material’s surface reflectivity, the laser power, and its radius at the sample surface, respectively.

The thermoelastic equation for the stress and surface displacement caused by a laser-induced nonuniform temperature distribution, in the quasi-static approximation, can be expressed in cylindrical coordinates by introducing the scalar displacement potential Ψ and the Love function ψ following by the Poisson’s equation [17

17. W. Nowacki, Thermoelasticity (Pergamon, 1982), Vol. 3, p. 11.

],
2Ψ(r,z,t)=1+ν1ναTT(r,z,t),
(16)
and the Biharmonic equation,
22ψ(r,z,t)=0.
(17)
αT is the linear thermal expansion coefficient, and ν the Poisson’s ratio.

The components of the displacement vector (uz) and the stress (σii) are obtained from Ψ(r,z,t) and ψ(r,z,t) by the relations
uz=Ψz+112ν[2(1ν)22z2]ψ
(18)
and
σzz=E1+ν(2r2+1rr)Ψ+E1ν2ν2[(2ν)22z2]ψr,
(19)
σrr=E1+ν(2z2+1rr)Ψ+E1ν2ν2[ν22r2]ψz,
(20)
σϕϕ=E1+ν(2r2+2z2)Ψ+E1ν2ν2[ν21rr]ψz,
(21)
where E is the Young’s modulus and the Laplacian 2=2/r2+r1/r+2/z2. Eqs. (16) and (17) are solved using free stress boundary conditions, σrz=σzz=0, at the surfaces.

Recently [13

13. N. G. C. Astrath, L. C. Malacarne, P. R. B. Pedreira, A. C. Bento, M. L. Baesso, and J. Shen, “Time-resolved thermal mirror for nanoscale surface displacement detection in low absorbing solids,” Appl. Phys. Lett. 91, 191908 (2007). [CrossRef]

,15

15. L. C. Malacarne, N. G. C. Astrath, G. V. B. Lukasievcz, E. K. Lenzi, M. L. Baesso, and S. E. Bialkowski, “Time-resolved thermal lens and thermal mirror spectroscopy with sample-fluid heat coupling: A complete model for material characterization,” Appl. Spectrosc. 65, 99–104 (2011). [CrossRef]

,18

18. N. G. C. Astrath, L. C. Malacarne, V. S. Zanuto, M. P. Belancon, R. S. Mendes, M. L. Baesso, and C. Jacinto, “Finite-size effect on the surface deformation thermal mirror method,” J. Opt. Soc. Am. B 28, 1735–1739 (2011). [CrossRef]

], we have obtained semianalytical expressions for the temperature and thermoelastic potentials. In those solutions, we were assuming that the radial dimension of the sample was large enough for the temperature to be considered constant at the edges of the sample, that is, T(,z,t)=0. In fact, the solutions were validated by all numerical finite elemental analysis modeling with real boundary conditions [15

15. L. C. Malacarne, N. G. C. Astrath, G. V. B. Lukasievcz, E. K. Lenzi, M. L. Baesso, and S. E. Bialkowski, “Time-resolved thermal lens and thermal mirror spectroscopy with sample-fluid heat coupling: A complete model for material characterization,” Appl. Spectrosc. 65, 99–104 (2011). [CrossRef]

,18

18. N. G. C. Astrath, L. C. Malacarne, V. S. Zanuto, M. P. Belancon, R. S. Mendes, M. L. Baesso, and C. Jacinto, “Finite-size effect on the surface deformation thermal mirror method,” J. Opt. Soc. Am. B 28, 1735–1739 (2011). [CrossRef]

]. Using this approximation, and assuming no azimuthal dependence for the temperature distribution, we can write the temperature rise as
T(r,t)=0T(α,t)J0(αr)αdα.
(22)
Jn(ξ) is the Bessel function of the first kind, and
T(α,t)=Q0ω2e18ω2α2(1eDtα24Dα2)
(23)
is the Hankel transform of the r-dependent temperature (α space). D=k/(ρc) represents the thermal diffusivity of the sample. The scalar displacement potential and the Love function are
Ψ(r,z,t)=1+ν1ναT0T(α,t)α1J0(αr)dα,
(24)
and
ψ(r,z,t)=αT0f(α,z)α2T(α,t)J0(αr)dα,
(25)
with
f(α,z)=ν1+2ν2l0α+sinh(l0α)e(l0+z)α2(ν1)[el0α(l0αzα2ν)+e(l0+2z)α(l0α+zα2ν)+e2zα(zα+2ν)+e2l0α(zα+2ν)].
(26)

The above expressions allow us to write the displacement and stresses in a simple manner as
Δl=4(1+ν)αT0h(l0,α)T(α,t)J0(rα)dα,
(27)
σr=EαT(ν1)0(1r4νh(l0,α)rl0α)J1(rα)T(α,t)dα,
(28)
σz=EαT(ν1)0(14h(l0,α)l0α)J0(rα)T(α,t)αdα,
(29)
and
σϕ=EαT(ν1)0(14νh(l0,α)l0α)J0(rα)T(α,t)αdαEαT(ν1)0(1r4νh(l0,α)rl0α)J1(rα)T(α,t)dα,
(30)
where
h(l0,α)=cosh(l0α)1sinh(l0α)+l0α,
(31)
and
σi=1l00l0σii(r,z,t)dz.
(32)

The symmetric and antisymmetric combinations of the radial and azimuthal aberrations to the optical path length lead to
Sst+(r,t)=ϑ0(q+3q)J0(rα)T(α,t)αdαϑ0[qν+q(2+ν)]h(l0,α)l0/4J0(rα)T(α,t)dα,
(33)
and
Sst(r,t)=ϑ0(qq)[ανh(l0,α)l0/4]J2(rα)T(α,t)dα,
(34)
with ϑ=(n0s)3EαTl0/(44ν). The stress contributions to the refractive index variation can be neglected for some optical materials because it is substantially smaller than the thermal contribution [4

4. C. A. Klein, “Optical distortion coefficients of high-power laser windows,” Opt. Eng. 29, 343–350 (1990). [CrossRef]

]. However, for materials which (ns/T)th<0, the thermal expansion contribution can be suppressed and the stress contribution becomes relevant. As for Sst(r,t), it contributes only if the material is stress-birefringent.

Using Eqs. (14) and (27), the thermal expansion contribution can be written as
Sexp(r,t)=4(n0s1)(1+ν)αT0h(l0,α)T(α,t)J0(rα)dα.
(35)

Finally, with Eqs. (8), (22), (33), and (35), we can write S(r,t) for free stress-birefringent material, that is qq, as
S(r,t)=0l0{(nsT)th+(n0s)3EαT4(1ν)[(q+3q)4[qν+q(2+ν)]h(l0,α)l0α]+4(n0s1)(1+ν)αTh(l0,α)l0α}T(α,t)J0(rα)αdα.
(36)
The general solutions presented here can be simplified if one take the following limits. For l00, the expression for S(r,t) recovers the plane-stress approximation,
S0(r,t)=l0χ00T(α,t)J0(rα)αdα,
(37)
and, for l0, it recovers the plane-strain approximation,
S(r,t)=l0χ0T(α,t)J0(rα)αdα,
(38)
where
χ0=(nsT)th+(n0s)3EαT4(q+q)+(n0s1)(1+ν)αT
(39)
and
χ=(nsT)th+(n0s)3EαT4(1ν)(q+3q).
(40)
Eqs. (37) and (38) describe the well-known results for thin-disk and long-rod geometries [3

3. M. Sparks, “Optical distortion by heated windows in high-power laser systems,” J. Appl. Phys. 42, 5029–5046 (1971). [CrossRef]

,4

4. C. A. Klein, “Optical distortion coefficients of high-power laser windows,” Opt. Eng. 29, 343–350 (1990). [CrossRef]

].

To illustrate and support the analytical solutions, Eqs. (36) to (40), we perform simulations considering physical parameters of a calcium fluoride windows (CaF2) [6

6. C. A. Klein, “Analytical stress modeling of high-energy laser windows: Application to fusion-cast calcium fluoride windows,” J. Appl. Phys. 98, 043103 (2005). [CrossRef]

]. Figure 2 shows the normalized temperature, T(r,t)/T(0,t), and surface displacement, uz(r,t)/uz(0,t), profiles for windows with different thicknesses at an exposure time of t=0.2s and ω=50μm. The temperature profile has a sharp shape compared with the surface displacement for thick windows, which is caused by the mechanical inertia of the surface to expand upon temperature change. Both the temperature and the surface deformation profiles become similar only for very small thickness. This, in fact, validates the thin-disk, or the plane-stress, approximation. However, it is important to note that approximating the surface deformation by the temperature profile is reasonably acceptable only for very thin samples.

Fig. 2. Radial temperature (open circles) and surface displacement (continuous lines) profiles for the CaF2 windows glass.

The limit cases, plane-stress and plane-strain, are better explored by analyzing the optical path change. Figure 3 shows the optical path S(r,t) scaled by a factor l0Q0 for r=ω and different thicknesses. S(r,t) was evaluated by Eq. (36) and the limit cases by Eqs. (37) and (38), respectively. The results illustrate well the total phase shift moving from a plane-stress approximation, for small l0, to the plane-strain as l0 increases.

Fig. 3. Time dependence of the optical path S(r,t)/(l0Q0) for ω=50μm using the physical parameters of CaF2 glass windows [6]. Solid lines were calculated using Eq. (36) and Eqs. (37) and (38) for plane-stress (open squares) and plane-strain (open circles) approximations, respectively.

Figure 4 shows the time and radial evolution of the optical path S(r,t) for a windows of thickness l0=2.0mm. The radial dependence of the optical path length induces aberration in the wavefront propagation. The corresponding phase shift is given by
ϕ(r,t)=2πλ[S(r,t)S(0,t)],
(41)
where λ is the laser wavelength. In fact, Eq. (41) provides an expression for analyzing the thermal lens effect caused by a laser-induced optical element. This effect is important in high-power laser systems and has numerous applications in photothermal effect based techniques [10

10. J. Shen, M. L. Baesso, and R. D. Snook, “Three-dimensional model for cw laser-induced mode-mismatched dual-beam thermal lens spectrometry and time-resolved measurements of thin-film samples,” J. Appl. Phys. 75, 3738–3748 (1994). [CrossRef]

12

12. N. G. C. Astrath, F. B. G. Astrath, J. Shen, J. Zhou, P. R. B. Pedreira, L. C. Malacarne, A. C. Bento, and M. L. Baesso, “Top-hat cw-laser-induced time-resolved mode-mismatched thermal lens spectroscopy for quantitative analysis of low-absorption materials,” Opt. Lett. 33, 1464–1466 (2008). [CrossRef]

,15

15. L. C. Malacarne, N. G. C. Astrath, G. V. B. Lukasievcz, E. K. Lenzi, M. L. Baesso, and S. E. Bialkowski, “Time-resolved thermal lens and thermal mirror spectroscopy with sample-fluid heat coupling: A complete model for material characterization,” Appl. Spectrosc. 65, 99–104 (2011). [CrossRef]

] for material characterization, such as in the thermal lens spectrometry. As for high-power laser systems, a criterion normally used to characterize the laser beam distortion is the Strehl ratio—the ratio of the intensity at the point of maximum intensity in the observation plane with and without phase aberration. For instance, in an untruncated Gaussian illumination with beam radius ω, it is given by [19

19. R. Herloski, “Strehl ratio for untruncated aberrated Gaussian beams,” J. Opt. Soc. Am. A 2, 1027–1030 (1985). [CrossRef]

]
Sg=|02π0er2/ω2eiϕ(r,t)rdrdϕ|2|02π0er2/ω2rdrdϕ|2.
(42)
In a similar way, in the thermal lens spectrometry, the intensity I(t) of the center beam at the far field detector plane is given by [10

10. J. Shen, M. L. Baesso, and R. D. Snook, “Three-dimensional model for cw laser-induced mode-mismatched dual-beam thermal lens spectrometry and time-resolved measurements of thin-film samples,” J. Appl. Phys. 75, 3738–3748 (1994). [CrossRef]

]
I(t)=|0exp[(1+iV)giϕ(g,t)]dg|2|0exp[(1+iV)g]dg|2,
(43)
in which V is a geometric parameter from the experimental setup, g=(r/ωp)2, and ωp the probe beam radius in the mode mismatched configuration [10

10. J. Shen, M. L. Baesso, and R. D. Snook, “Three-dimensional model for cw laser-induced mode-mismatched dual-beam thermal lens spectrometry and time-resolved measurements of thin-film samples,” J. Appl. Phys. 75, 3738–3748 (1994). [CrossRef]

12

12. N. G. C. Astrath, F. B. G. Astrath, J. Shen, J. Zhou, P. R. B. Pedreira, L. C. Malacarne, A. C. Bento, and M. L. Baesso, “Top-hat cw-laser-induced time-resolved mode-mismatched thermal lens spectroscopy for quantitative analysis of low-absorption materials,” Opt. Lett. 33, 1464–1466 (2008). [CrossRef]

].

Fig. 4. Time and radial evolution to the optical path S(r,t)/(l0Q0)(×108) for the CaF2 [6] glass windows for l0=2mm.

In conclusion, we have developed a unified analytical theory for the wavefront distortion caused by laser-induced thermal lens. The theory applies not only to plane-stress and plane-strain type distributions, but also for stress and strain contributions within these limit cases. Radial and time-dependent expressions for the temperature, surface displacement, and stresses have been obtained. This generalized model could have significant impact on designing laser systems and predicting laser-induced windows degradation in optical materials. Furthermore, the optical path description presented in this work has direct application in thermal lens spectrometry, correlating optical path change to thermo-optical properties of solid materials.

ACKNOWLEDGMENTS

The authors are thankful to the Brazilian agencies CAPES, CNPq, and Fundação Araucária for the financial support of this work.

REFERENCES

1.

C. Zhao, J. Degallaix, L. Ju, Y. Fan, D. G. Blair, B. J. J. Slagmolen, M. B. Gray, C. M. Mow Lowry, D. E. McClelland, D. J. Hosken, D. Mudge, A. Brooks, J. Munch, P. J. Veitch, M. A. Barton, and G. Billingsley, “Compensation of strong thermal lensing in high-optical-power cavities,” Phys. Rev. Lett. 96, 231101(2006). [CrossRef]

2.

W. Winkler, K. Danzmann, A. Rüdiger, and R. Schilling, “Heating bu optical absorption and the performance of interferometric gravitational-wave detectors,” Phys. Rev. A 44, 7022–7036 (1991). [CrossRef]

3.

M. Sparks, “Optical distortion by heated windows in high-power laser systems,” J. Appl. Phys. 42, 5029–5046 (1971). [CrossRef]

4.

C. A. Klein, “Optical distortion coefficients of high-power laser windows,” Opt. Eng. 29, 343–350 (1990). [CrossRef]

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10.

J. Shen, M. L. Baesso, and R. D. Snook, “Three-dimensional model for cw laser-induced mode-mismatched dual-beam thermal lens spectrometry and time-resolved measurements of thin-film samples,” J. Appl. Phys. 75, 3738–3748 (1994). [CrossRef]

11.

N. G. C. Astrath, J. H. Rohling, A. N. Medina, A. C. Bento, M. L. Baesso, C. Jacinto, T. Catunda, S. M. Lima, F. G. Gandra, M. J. V. Bell, and V. Anjos, “Time-resolved thermal lens measurements of the thermo-optical properties of glasses at low temperature down to 20 K,” Phys. Rev. B 71, 214202 (2005). [CrossRef]

12.

N. G. C. Astrath, F. B. G. Astrath, J. Shen, J. Zhou, P. R. B. Pedreira, L. C. Malacarne, A. C. Bento, and M. L. Baesso, “Top-hat cw-laser-induced time-resolved mode-mismatched thermal lens spectroscopy for quantitative analysis of low-absorption materials,” Opt. Lett. 33, 1464–1466 (2008). [CrossRef]

13.

N. G. C. Astrath, L. C. Malacarne, P. R. B. Pedreira, A. C. Bento, M. L. Baesso, and J. Shen, “Time-resolved thermal mirror for nanoscale surface displacement detection in low absorbing solids,” Appl. Phys. Lett. 91, 191908 (2007). [CrossRef]

14.

F. Sato, L. C. Malacarne, P. R. B. Pedreira, M. P. Belancon, R. S. Mendes, M. L. Baesso, N. G. C. Astrath, and J. Shen, “Time-resolved thermal mirror method: A theoretical study,” J. Appl. Phys. 104, 053520 (2008). [CrossRef]

15.

L. C. Malacarne, N. G. C. Astrath, G. V. B. Lukasievcz, E. K. Lenzi, M. L. Baesso, and S. E. Bialkowski, “Time-resolved thermal lens and thermal mirror spectroscopy with sample-fluid heat coupling: A complete model for material characterization,” Appl. Spectrosc. 65, 99–104 (2011). [CrossRef]

16.

H. S. Carslaw and J. C. Jaeger, Conduction of Heat in Solids (Clarendon Press, 1959), Vol. 1, p. 78.

17.

W. Nowacki, Thermoelasticity (Pergamon, 1982), Vol. 3, p. 11.

18.

N. G. C. Astrath, L. C. Malacarne, V. S. Zanuto, M. P. Belancon, R. S. Mendes, M. L. Baesso, and C. Jacinto, “Finite-size effect on the surface deformation thermal mirror method,” J. Opt. Soc. Am. B 28, 1735–1739 (2011). [CrossRef]

19.

R. Herloski, “Strehl ratio for untruncated aberrated Gaussian beams,” J. Opt. Soc. Am. A 2, 1027–1030 (1985). [CrossRef]

OCIS Codes
(240.6700) Optics at surfaces : Surfaces
(350.5340) Other areas of optics : Photothermal effects
(350.6830) Other areas of optics : Thermal lensing

ToC Category:
Optics at Surfaces

History
Original Manuscript: April 3, 2012
Revised Manuscript: May 15, 2012
Manuscript Accepted: May 16, 2012
Published: June 25, 2012

Virtual Issues
July 20, 2012 Spotlight on Optics

Citation
Luis C. Malacarne, Nelson G. C. Astrath, and Mauro L. Baesso, "Unified theoretical model for calculating laser-induced wavefront distortion in optical materials," J. Opt. Soc. Am. B 29, 1772-1777 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-7-1772


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References

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  8. Y. Peng, Z. Sheng, H. Zhang, and X. Fan, “Influence of thermal deformations of the output windows of high-power laser systems on beam characteristics,” Appl. Opt. 43, 6465–6472 (2004). [CrossRef]
  9. W. Koechner and M. Bass, Solid-State Lasers: A Graduate Text (Springer, 2003).
  10. J. Shen, M. L. Baesso, and R. D. Snook, “Three-dimensional model for cw laser-induced mode-mismatched dual-beam thermal lens spectrometry and time-resolved measurements of thin-film samples,” J. Appl. Phys. 75, 3738–3748 (1994). [CrossRef]
  11. N. G. C. Astrath, J. H. Rohling, A. N. Medina, A. C. Bento, M. L. Baesso, C. Jacinto, T. Catunda, S. M. Lima, F. G. Gandra, M. J. V. Bell, and V. Anjos, “Time-resolved thermal lens measurements of the thermo-optical properties of glasses at low temperature down to 20 K,” Phys. Rev. B 71, 214202 (2005). [CrossRef]
  12. N. G. C. Astrath, F. B. G. Astrath, J. Shen, J. Zhou, P. R. B. Pedreira, L. C. Malacarne, A. C. Bento, and M. L. Baesso, “Top-hat cw-laser-induced time-resolved mode-mismatched thermal lens spectroscopy for quantitative analysis of low-absorption materials,” Opt. Lett. 33, 1464–1466 (2008). [CrossRef]
  13. N. G. C. Astrath, L. C. Malacarne, P. R. B. Pedreira, A. C. Bento, M. L. Baesso, and J. Shen, “Time-resolved thermal mirror for nanoscale surface displacement detection in low absorbing solids,” Appl. Phys. Lett. 91, 191908 (2007). [CrossRef]
  14. F. Sato, L. C. Malacarne, P. R. B. Pedreira, M. P. Belancon, R. S. Mendes, M. L. Baesso, N. G. C. Astrath, and J. Shen, “Time-resolved thermal mirror method: A theoretical study,” J. Appl. Phys. 104, 053520 (2008). [CrossRef]
  15. L. C. Malacarne, N. G. C. Astrath, G. V. B. Lukasievcz, E. K. Lenzi, M. L. Baesso, and S. E. Bialkowski, “Time-resolved thermal lens and thermal mirror spectroscopy with sample-fluid heat coupling: A complete model for material characterization,” Appl. Spectrosc. 65, 99–104 (2011). [CrossRef]
  16. H. S. Carslaw and J. C. Jaeger, Conduction of Heat in Solids (Clarendon Press, 1959), Vol. 1, p. 78.
  17. W. Nowacki, Thermoelasticity (Pergamon, 1982), Vol. 3, p. 11.
  18. N. G. C. Astrath, L. C. Malacarne, V. S. Zanuto, M. P. Belancon, R. S. Mendes, M. L. Baesso, and C. Jacinto, “Finite-size effect on the surface deformation thermal mirror method,” J. Opt. Soc. Am. B 28, 1735–1739 (2011). [CrossRef]
  19. R. Herloski, “Strehl ratio for untruncated aberrated Gaussian beams,” J. Opt. Soc. Am. A 2, 1027–1030 (1985). [CrossRef]

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