Chinese Optics Letters, 2013, 11 (9): 091404, Published Online: Sep. 3, 2013
High-power high-brightness 2-\mu m continuous wave laser with a double-end dif fusion-bonded Tm, Ho:YVO4 crystal 
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140.3480 Lasers, diode-pumped 140.3580 Lasers, solid-state 140.5680 Rare earth and transition metal solid-state lasers
Abstract
This letter demonstrates an efficient high-power high-brightness 2-\mu m continuous-wave (CW) laser with double-end, diffusion-bonded Tm, Ho:YVO4 crystal cooled with liquid N2. The reduction in thermal stress in the composite Tm, Ho:YVO4 rod enabled the laser to achieve a laser output power of 23.4 W at 2.05 \mu m, which is 1.37 times higher than that of the non-composite Tm, Ho:YVO4 rod. The corresponding slope efficiency is 37.3% and the optical–optical conversion efficiency is 35.4%. The beam quality M2 factor is about 1.85 at 20 W output level with circularly symmetric beam spot.
Gang Li, Yuqiu Gu, Baoquan Yao, Lianqiang Shan, Yuezhu Wang. High-power high-brightness 2-\mu m continuous wave laser with a double-end dif fusion-bonded Tm, Ho:YVO4 crystal[J]. Chinese Optics Letters, 2013, 11(9): 091404.
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