321 W high-efficiency continuous-wave green laser produced by single-pass frequency doubling of a narrow-linewidth fiber laser

In this study, a high-power continuous-wave green laser for copper processing is investigated. The laser is produced by single-pass second-harmonic generation (SHG) of a narrow-linewidth fiber laser. Based on Sellmeier equations, the factors (e.g., fundamental wave linewidth, temperature, and angle)...

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Bibliographic Details
Published in:Applied optics (2004) 2021-05, Vol.60 (13), p.3836
Main Authors: Su, Mengqi, You, Yang, Quan, Zhao, Shen, Hui, Li, Qiurui, Liu, Wansheng, Qi, Yunfeng, Zhou, Jun
Format: Article
Language:English
Subjects:
Clean energy
Continuous radiation
Fiber lasers
Lasers
Phase matching
Polarization
Second harmonic generation
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Summary:In this study, a high-power continuous-wave green laser for copper processing is investigated. The laser is produced by single-pass second-harmonic generation (SHG) of a narrow-linewidth fiber laser. Based on Sellmeier equations, the factors (e.g., fundamental wave linewidth, temperature, and angle) that decide LBO noncritical phase matching are theoretically analyzed for optimizing the SHG setup. A narrow-linewidth polarization-maintained fiber laser is used as the fundamental laser with a linewidth of 20 GHz and polarization extinction ratio of greater than 15 dB. Type I noncritical phase-matching LBO is used as the nonlinear crystal in the SHG. A green laser (up to 321 W) is obtained from a 784 W fundamental laser with a conversion efficiency of 40.9%. The green laser is near-diffraction-limited and has a ð'€2 factor of 1.07.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.422514