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17 February 2010 Low-cost frequency-converted laser light sources
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We report a fast-switching two-component frequency-converted laser with reduced speckle visibility. A bottom-emitting passively Q-switched laser with integrated electroabsorber, folding mirror and coupling lens was successfully applied with a waveguide-type periodically poled magnesium oxide doped lithium niobate crystal to generate second harmonic light at 532 nm. Reduced speckle visibility was demonstrated when operating the laser in self-pulsating mode when compared to continuous-wave operation even when using a nonlinear crystal with narrow acceptance bandwidth of 0.24 nm @ 1064 nm. The spectral width of the infrared light was 0.33 nm in pulsed mode and 0.08 nm in continuous-wave mode resulting in visible light spectral width of 0.12 nm and 0.03 nm in self-pulsating and continuous-wave mode.
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J. Konttinen, P. Tuomisto, T. Vallius, P. Pietilä, and T. Jouhti "Low-cost frequency-converted laser light sources", Proc. SPIE 7578, Solid State Lasers XIX: Technology and Devices, 75780S (17 February 2010);

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