Nonlinear optical properties of silicon under the influence of ultrashort laser pulses of the infrared spectrum range (1.2–2.4 µm)

Smirnov, N.A., Gulina, Y.S., Busleev N.I., Kudryashov, S.I., Pakholchuk, P.P., Kotenev T.Y.

For Russian citation (Opticheskii Zhurnal):

Смирнов Н.А., Гулина Ю.С., Буслеев Н.И., Кудряшов С.И., Пахольчук П.П., Котенев Т.Ю. Нелинейно-оптические свойства кремния при воздействии ультракоротких лазерных импульсов инфракрасного спектрального диапазона (1,2–2,4 мкм) // Оптический журнал. 2025. Т. 92. № 7. С. 95–101. http://doi.org/10.17586/1023-5086-2025-92-07-95-101

Smirnov N.A., Gulina Yu.S., Busleev N.I., Kudryashov S.I., Pakholchuk P.P., Kotenev T.Yu. Nonlinear optical properties of silicon under the influence of ultrashort laser pulses of the infrared spectrum range (1.2–2.4 µm) [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 7. P. 95–101. http://doi.org/10.17586/1023-5086-2025-92-07-95-101

For citation (Journal of Optical Technology):

Abstract:

Subject of the study. Nonlinear absorption in single-crystal silicon in the mid infrared spectrum range (1.2–2.4 µm) in the field of high-intensity femtosecond laser pulses. Aim of study. Measuring the coefficients of silicon multiphoton absorption in the field of high-intensity femtosecond laser pulses in the mid infrared range to select effective modes of silicon laser processing. Method. Multiphoton absorption coefficients were estimated by measuring the radiant power of radiation transmitted through silicon with subsequent approximation of the dependences. Main results. Nonlinear optical properties of silicon excited by high-intensity ultrashort laser pulses of the mid infrared radiation were investigated. The two-photon nature of absorption was demonstrated. The two-photon absorption coefficient for wavelengths of 1.2–2.4 µm is in the range of 1.1–0.4 cm/GW. Practical significance. Understanding the process of nonlinear photoionization and obtaining such parameters as multiphoton absorption coefficients is of key importance in choosing effective modes of silicon laser processing.

Keywords:

silicon, nonlinear absorption, ultrashort laser pulses, mid infrared range

Acknowledgements:

the study was supported by the grant of the Russian Science Foundation № 24-22-00290

OCIS codes: 140.0140, 240.0310

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