This article is cited in 2 papers

Nonlinear optics

Nonlinear phenomena in femtosecond laser systems based on Yb : YAG thin-rod amplifiers

J. W. Kim^a, S. Park^a, E. G. Sall^a, G. H. Kim^a, V. E. Yashin^b, J. H. Yang<sup>a

a</sup> Electro-Medical Device Research Center, Korea Electrotechnology Research Institute
^b ITMO University

Abstract: Nonlinear effects in a high-power laser amplification system based on thin-rod active elements are experimentally investigated. It is shown that the most important nonlinear effect is the Kerr effect leading to self-focusing and self-phase modulation of laser radiation. The observed luminescence in Yb : YAG crystals in the visible region of the spectrum is caused by the charge transfer luminescence effect, which, in turn, is due to multiphoton absorption of laser radiation. Second-order nonlinearity in the crystal is used to effectively convert femtosecond pulses to second harmonic and sum-frequency waves which exhibit radiations of green and UV spectra.

Keywords: nonlinear phenomena, thin rods, Yb : YAG, Kerr effect, self-focusing, self-phase modulation, femtosecond laser pulses, high power laser system.

Received: 01.12.2021
Accepted: 01.12.2021

 English version: Quantum Electronics, 2022, 52:4, 313–321

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