Nonlinear optical absorption in CdS thin films at 1030 nm and 515 nm

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发表日期：

2026年1月9日

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R. A. Ganeev,
Y. A. Buriyev,
V. V. Kim,
B. K. Eshchanov,
B. R. Sobirov,
M. K. Kodirov,
I. B. Sapaev,
S. Sadullaev

摘要

The CdS nanocrystallite films prepared by thermal deposition are characterized by different morphological and optical methods. The nonlinear optical absorption of 1030 nm and 515 nm, 200 fs radiation in the films is determined. The competition of saturable absorption and two-photon absorption is shown in the case of the variation of the pulse energies of the visible and infrared radiation. We show the overlap of the positive and negative nonlinear absorption in different energy ranges of the probe pulses. The saturated intensities of the CdS film are determined to be 1.7 × 10¹² W cm⁻² in the case of 1030 nm probe pulses and 1.3 × 10¹¹ W cm⁻² in the case of 515 nm probe pulses. The two-photon absorption coefficient in the case of 1030 nm pulses is calculated to be 4.7 × 10⁻⁸ cm W⁻¹. The two-photon absorption coefficient in the case of 515 nm probe pulses is determined to be 8 × 10⁻⁸ cm W⁻¹.