10 February 2011 Second harmonic generation with continuous-wave fiber lasers in periodically poled non-linear crystals
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Abstract
We present in this paper second-harmonic generation (SHG) results of narrow-linewidth continuous-wave 1064 nm fiber lasers in periodically-poled crystals. We particularly compare SHG efficiencies that can be obtained in PPLN with single-frequency linearly-polarized fiber lasers and with narrow linewidth longitudinally multimode linearly-polarized fiber lasers. Both infrared lasers can provide around 4.5W at 1064nm. Due to the high number of modes, sum-frequencies between modes enhance the efficiency of multimode SHG by a factor of roughly 2 compared to single-frequency, but green generated radiation suffers from important intensity noise. Conversely, single-frequency SHG is less efficient, but intensity noise is greatly improved.
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Mathieu Jacquemet, David Harnois, Alain Mugnier, David Pureur, "Second harmonic generation with continuous-wave fiber lasers in periodically poled non-linear crystals", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79142C (10 February 2011); doi: 10.1117/12.874541; https://doi.org/10.1117/12.874541
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