Dual-wavelength neodymium-doped yttrium aluminum garnet laser with chromium-doped yttrium aluminum garnet as frequency selector

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Abstract
We report on a potential source for the generation of terahertz radiation using the well-known neodymium-doped yttrium aluminum garnet as the laser material, and chromium-doped yttrium aluminum garnet (Cr:YAG) as the frequency selector and saturable absorber. Continuous-wave output power as high as 5.28 W at 1052 nm was achieved. With Cr:YAG, the laser has a dual-wavelength output at 1052 and 1064 nm. The maximum average output power, pulse repetition rate, and pulse energy are 3.75 W, 41.2 kHz, and 90.1 μJ , respectively. We also found that the intensity ratio of the two oscillating modes can be tuned by adjusting the pump power.