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16 May 2012 High-beam-quality narrow-linewidth 13W continuous-wave fiber-based source at 970 nm
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We demonstrate a high-power fiber-laser-based source of continuous-wave (cw), linearly-polarized radiation at 970 nm in a simple, compact, and practical design. Using direct single-pass second-harmonic-generation (SP-SHG) of a cw thulium fiber laser at 1940 nm in a 40-mm-long periodically-poled LiNbO3 (PPLN) crystal, we have generated 13.1 W of output power at 970 nm for a fundamental power of 40 W. We achieved conversion efficiency as high as 32.7%. The generated second-harmonic output exhibits a passive power stability better than 1.4% (1σ value) over 1 hour, has a linewidth better than 0.3 nm, and a TEM00 spatial beam profile with M2<1.6. We further performed relevant theoretical calculations for the characterization of SP-SHG in the crystal.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kavita Devi, S. Chaitanya Kumar, and M. Ebrahim-Zadeh "High-beam-quality narrow-linewidth 13W continuous-wave fiber-based source at 970 nm", Proc. SPIE 8434, Nonlinear Optics and Applications VI, 843405 (16 May 2012);


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