This article is cited in 3 papers

Lasers

Amplification of laser radiation in disk Yb:YAG crystals cooled down to the liquid nitrogen temperature

E. A. Perevezentsev, I. B. Mukhin, O. V. Palashov, E. A. Khazanov

Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod

Abstract: The parameters of a diode-pumped Yb:YAG amplifier are calculated. The derived expressions allow one to determine the optimal doping of the YAG crystal with Yb ions, which is ~10% for a 600-μm-thick crystal. The calculations take into account the absorption line profile and the characteristics of the pump spectrum (the shape, width, central wavelength). When the 10% Yb-doped YAG crystal is cooled down from 296 K to 80 K, the shift of the gain profile centre (~0.3 nm) and the increase in the stimulated emission cross section (by four times) as well as the depletion of the lower working level are observed. The small-signal gain (the maximum value is 1.7, which corresponds to the gain 4.4 cm^-1) is measured as a function of the absorbed pump power and well agrees with the results of theoretical calculations.

PACS: 42.55.Rz, 42.60.Lh

Received: 26.12.2008
Revised: 12.05.2009

 English version: Quantum Electronics, 2009, 39:9, 807–813

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