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Closed aperture CW Z-scan of L-tryptophan for determination of optical nonlinearity in the thermal regime

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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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Supplementary Material (5)

NameDescription
Dataset 1       Experimental dataset in csv format.
Dataset 2       Data for Figs. 5 and 6.
Dataset 3       Organized data for determination of phase-shift (DelPhi0) graph presenting Delphi determination (16 set).
Dataset 4       Calculation of experimental results for thermo-optic coefficient dn/dT, thermal coefficient of refractive index n2T and nonlinear absorption coefficient (beta).
Supplement 1       Percentage of fitting of tryptophan and water Z-scan data.

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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Figures (10)

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Tables (1)

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Equations (8)

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