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.
© 2013 Chinese Optics Letters
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
Lasers and Laser Optics
Gang Li, Yuqiu Gu, Baoquan Yao, Lianqiang Shan, and Yuezhu Wang, "High-power high-brightness 2-\mu m continuous wave laser with a double-end dif fusion-bonded Tm, Ho:YVO4 crystal," Chin. Opt. Lett. 11, 091404- (2013)