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Study of femtosecond nonlinear optical coefficients for Bi doped Se_85-xTe₁₅Bi_x chalcogenide thin films

P. Yadav^a, C. Tyagi^b,*, A. Devi^c, N. Gahlot^d

a,d St. Andrews Institute of Technology & Management, Gurugram, Haryana, India
b Department of Applied Sciences, The NorthCap University Gurugram, Haryana, India
c Amity University Haryana, Amity Education Valley, Pachgaon, Manesar, Gurugram, Haryana 122413

* Corresponding Author:

Chalcogenide Letters 2023, 20(5), 353-365. https://doi.org/10.15251/CL.2023.205.353

Received 18 March 2023; Accepted 15 May 2023;

Abstract

The present work reports the influence of selenium replacement by bismuth on the nonlinear optical parameters of ternary Se_85-xTe₁₅Bi_x (x=0, 1, 2, 3, 4, 5 atomic %) chalcogenide thin films. Calculation of nonlinear refractive index (n2>/sub>), two-photon absorption coefficient (β2>/sub>) and third-order susceptibility (χ ⁽³⁾ ) by well known Z-scan technique with femtosecond laser pulses were done. The Z-scan spectra for Se_85-xTe₁₅Bi_x upto Bi= 4 atomic % results in self- focusing behavior of n2>/sub> is positive while for Bi=5 atomic % n2>/sub> is negative. The behavior of n2>/sub> by using different physical parameters are exlpained. The comparison of experimental and theoretical values of n2>/sub> with pure silica are also studied. The presence of the valley at focus in open aperture Z-scan graph demonstrates strong reverse saturable absorption. The figure of merit (FOM) for the SeTe-Bi chalcogenide thin films is found to be less than 1 and are beneficial for all-optical switch devices.

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Keywords

Chalcogenide glasses, Nonlinear refractive index (n_{2>/sub>), Two-photon absorption coefficient (β2>/sub>), Third-order susceptibility (χ ⁽³⁾ ), Z-scan technique}

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Cite This Article

APA Style

Yadav, P., Tyagi, C., Devi, A., Gahlot, N. (2023). Study of femtosecond nonlinear optical coefficients for Bi doped Se_85-xTe₁₅Bi_x chalcogenide thin films. Chalcogenide Letters, 20(5), 353–365. https://doi.org/10.15251/CL.2023.205.353

Vancouver Style

Yadav P, Tyagi C, Devi A, Gahlot N. Study of femtosecond nonlinear optical coefficients for Bi doped Se_85-xTe₁₅Bi_x chalcogenide thin films. Chalcogenide Letters. 2023;20(5):353–365. https://doi.org/10.15251/CL.2023.205.353

IEEE Style

P. Yadav, C. Tyagi, A. Devi, and N. Gahlot, “Study of femtosecond nonlinear optical coefficients for Bi doped Se_85-xTe₁₅Bi_x chalcogenide thin films,” Chalcogenide Letters, vol. 20, no. 5, pp. 353–365, 2023. https://doi.org/10.15251/CL.2023.205.353

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