Abstract
Cr<SUP>4+</SUP>:YAG crystal is a solid state laser active material broadly tunable in the near IR spectral region which makes it attractive for applications in optical fiber communications, laser remote sensing, eye-safe ranging and numerous other uses. In Cr:YAG laser crystal which is a low gain active medium the saturation of absorption of pump radiation has a significant role as the decreasing absorption with increasing pump power leads also to saturation of output power.In this paper we studied this effect and we report on absorption and laser characteristics of two Cr:YAG crystals with different chromium concentration and crystal preparation. The laser performances are compared under excitation from arc lamp-pumped Nd:YAG laser with maximum output power of 10W in four mirror and three mirror astigmatically compensated resonators.
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