24-W cryogenically cooled Nd:YAG monolithic 946-nm laser with a slope efficiency >70% | Zendy

C. Y. Cho | Zendy; C. Y. Lee | Zendy; C. C. Chang | Zendy; P. H. Tuan | Zendy; Keqing Huang | Zendy; YihFan Chen | Zendy

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24-W cryogenically cooled Nd:YAG monolithic 946-nm laser with a slope efficiency >70%

Author(s) -

C. Y. Cho,

C. Y. Lee,

C. C. Chang,

P. H. Tuan,

Keqing Huang,

YihFan Chen

Publication year - 2015

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.010126

Subject(s) - slope efficiency , materials science , lasing threshold , optics , laser , energy conversion efficiency , cryogenic temperature , absorption (acoustics) , optoelectronics , fiber laser , wavelength , physics , composite material

A high-power efficient monolithic Nd:YAG 946-nm laser is demonstrated at the cryogenic temperature. By exploring the absorption and the fluorescence spectra of the Nd:YAG crystal, it reveals the fact that the absorption bandwidth at 808 nm is narrowing and the fluorescence intensity at 1061 nm is significant enhanced when the temperature is decreased. The temperature dependence of the lasing threshold at 946 nm is found to display a minimum value near a temperature of 170 K. At an incident pump power of 34.5 W, the local heating leads the optimum temperature to be approximately 120 K and the maximum output power can reach 24.4 W with the conversion efficiency of 71% as well as the slope efficiency up to 75%.

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