This article is cited in 7 papers

Nonlinear optical phenomena

Power limitations and pulse distortions in an Yb : KGW chirped-pulse amplification laser system

G. H. Kim^ab, J. H. Yang^ab, A. V. Kulik^ab, E. G. Sall'^ab, S. A. Chizhov^ab, V. E. Yashin^c, U. Kang<sup>a

a</sup> Russia Science Seoul Center
^b DMC Hi-Tech Industry Center, Seoul
^c Institute of Laser Physics of the S. I. Vavilov State Optical Institute

Abstract: We have studied self-action effects (self-focusing and self-phase modulation) and stimulated Raman scattering in an Yb : KGW chirped-pulse amplification laser system. The results demonstrate that self-focusing in combination with thermal lensing may significantly limit the chirped pulse energy in this system (down to 200 μJ) even at a relatively long pulse duration (50 ps). Nonlinear lenses in the laser crystals in combination with thermal lenses bring the regenerative amplifier cavity in the laser system to the instability zone and limit the average output power at pulse repetition rates under 50 kHz. Self-phase modulation, a manifestation of self-action, may significantly distort a recompressed femtosecond pulse at energies near the self-focusing threshold. Stimulated Raman scattering in such a laser has a weaker effect on output parameters than do self-focusing and thermal lensing, and Raman spectra are only observed in the case of pulse energy instability.

Keywords: solid-state lasers, diode pumping, ultrashort pulses, nonlinear effects, self-action, self-focusing, stimulated Raman scattering, thermal lensing.

PACS: 42.55.Rz, 42.65.Jx, 42.65.Dr

Received: 10.01.2013
Revised: 10.04.2013

 English version: Quantum Electronics, 2013, 43:8, 725–730

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