Latest developments in resonantly diode-pumped Er:YAG lasers

Igor Kudryashov; Dmitri Garbuzov; Mark Dubinskii

doi:10.1117/12.721945

10 May 2007 Latest developments in resonantly diode-pumped Er:YAG lasers

Igor Kudryashov, Dmitri Garbuzov, Mark Dubinskii

Proceedings Volume 6552, Laser Source Technology for Defense and Security III; 65520K (2007) https://doi.org/10.1117/12.721945
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

Abstract

Significant performance improvement of the Er(0.5%):YAG diode pumped solid state laser (DPSSL) has been achieved by pump diode spectral narrowing via implementation of an external volumetric Bragg grating (VBG). Without spectral narrowing, with a pump path length of 15 mm, only 37% of 1532 nm pump was absorbed. After the VBG spectral narrowing, the absorption of the pumping radiation increased to 62 - 70%. As a result, the incident power threshold was reduced by a factor of 2.5, and the efficiency increased by a factor of 1.7, resulting in a slope efficiency of ~23 - 30%. A maximum of 51 W of CW power was obtained versus 31 W without the pump spectrum narrowing. More than 180 mJ QCW pulse output energy was obtained in a stable-unstable resonator configuration with a beam quality of M² = 1.3 in the stable direction and M² = 1.1 in the unstable direction. The measured slope efficiency was 0.138 J/J with a threshold energy of 0.91 J.

Citation Download Citation

Igor Kudryashov, Dmitri Garbuzov, and Mark Dubinskii "Latest developments in resonantly diode-pumped Er:YAG lasers", Proc. SPIE 6552, Laser Source Technology for Defense and Security III, 65520K (10 May 2007); https://doi.org/10.1117/12.721945

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