High-power high-brightness 2-μm continuous wave laser with a double-end diffusion-bonded Tm, Ho:YVO4 crystal

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（9）
• 页码范围: 60-63
• 页数: 4页
• 语种: 英文
• DOI: 10.3788/COL201311.091404

摘要

This letter demonstrates an efficient high-power high-brightness 2-μm 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 μm,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.