Abstract
The closed aperture continuous wave Z-scan of L-tryptophan at 661 nm
was performed to investigate the variation of on-axis nonlinear phase
shift $({\Delta {\Phi
_0}})$ with the change of optical field
strength. $\Delta {\Phi
_0}$ was found to vary nonlinearly with
irradiance (${I_0})$ in the range from 150 to ${{290}}\;{\rm{\;{\rm
MW}/}}{{\rm{m}}^2}$. This nonlinear variation is
explained by considering the effect of linear and nonlinear absorption
of radiation on the thermo-optical refractive index. Using the
quadratic fitting of $\Delta {\Phi
_0}$ with ${I_0}$, we have found the thermo-optic
coefficient of refractive index $dn/dT$, thermal coefficient of nonlinear
refractive index $n_2^T$, and the nonlinear absorption
coefficient $\beta$ in the observed power
regime.
© 2021 Optical Society of
America
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Data Availability
The research data are maintained by the corresponding author and are
available for scrutiny: Dataset
1, Ref. [48], Dataset
2, Ref. [49], Dataset
3, Ref. [50], Dataset
4, Ref. [51].
48. S. A. Tarek, F. B. Faruque, S. M. Sharafuddin, K. M. E. Hasan, A. K. M. M. Hossain, H. Ara, M. K. Biswas, and Y. Haque, “Experimental dataset in csv
format,” figshare (2021),
https://doi.org/10.6084/m9.figshare.16893796.
49. S. A. Tarek, F. B. Faruque, S. M. Sharafuddin, K. M. E. Hasan, A. K. M. M. Hossain, H. Ara, M. K. Biswas, and Y. Haque, “Data for Figs. 5 and
6,” figshare (2021),
https://doi.org/10.6084/m9.figshare.14761515.
50. S. A. Tarek, F. B. Faruque, S. M. Sharafuddin, K. M. E. Hasan, A. K. M. M. Hossain, H. Ara, M. K. Biswas, and Y. Haque, “Organized data for determination
of phase-shift (DelPhi0) graph presenting Delphi determination (16
set),” figshare (2021),
https://doi.org/10.6084/m9.figshare.14761527.
51. S. A. Tarek, F. B. Faruque, S. M. Sharafuddin, K. M. E. Hasan, A. K. M. M. Hossain, H. Ara, M. K. Biswas, and Y. Haque, “Calculation of experimental
results for thermo-optic coefficient dn/dT, Thermal coefficient of
refractive index n2T and nonlinear absorption coefficient
(beta),” figshare (2021),
https://doi.org/10.6084/m9.figshare.14761533.
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