Features of nonlinear absorption of Bi2Te3-xSex and Bi2-xSbxTe3-ySey films

A. M. Smirnov; I. D. Laktaev; P. I. Kuznetsov; K. M. Golant

doi:10.1117/12.2322135

14 May 2018 Features of nonlinear absorption of Bi₂-xSb_xTe₃-ySe_y films

A. M. Smirnov, I. D. Laktaev, P. I. Kuznetsov, K. M. Golant

Proceedings Volume 10684, Nonlinear Optics and its Applications 2018; 106842K (2018) https://doi.org/10.1117/12.2322135
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

The monocrystalline Bi₂Te_3-xSex and Bi_2-xSb_xTe_3-ySey films of various compositions and thickness were synthesized by MOCVD on sapphire substrates¹ . The transmission of laser pulses (duration τ≈35 ps, wavelength λ=1064 nm) through the films was measured as a function of radiation intensity with the aim to optimize functionality of these films deposited on different substrates as saturable absorbers for the application in passively mode-locked 1-2 μm wavelength lasers. There was investigated nonlinear absorption of films of various compositions and thickness with measured saturation intensity ≈ 20 MW/cm² for Bi₂Te_3-xSe_x and 45 MW/cm² for Bi_2-xSb_xTe_3-ySe_y. Data obtained can be explained by the classical nonlinearity – phase space filling in a quantum well² . As it was established earlier³ , the semiconductor conductivity type of the film without light interaction can be changed to the metallic conductivity type in the case of light interaction with the film, that is strongly nonlinear depends on the light intensity. At the same time, with a metallic conductivity type, the film becomes vulnerable for high light intensity.

Citation Download Citation

A. M. Smirnov, I. D. Laktaev, P. I. Kuznetsov, and K. M. Golant "Features of nonlinear absorption of Bi₂-xSb_xTe₃-ySe_y films", Proc. SPIE 10684, Nonlinear Optics and its Applications 2018, 106842K (14 May 2018); https://doi.org/10.1117/12.2322135

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