12 April 1996 Compact SHG green lasers
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Abstract
The combination of a laser material Nd:YVO4 and a nonlinear crystal KTiOPO4 (KTP) is a promising method for intracavity second harmonic generation (SHG) of laser diode pumped solid state lasers. A wavelength locking system, based on an optical feedback technique, is shown to contribute to locking the lasing wavelength of laser diode to the peak absorption wavelength of Nd:YVO4 and generating stable green light. By applying the wavelength locking system to multi-longitudinal mode laser diode, a continuous green light of 31 mW is efficiently generated for pumping power of 121 mW. The noise characteristics of generated green light are discussed in two cases of using a single or a multi-longitudinal mode laser diode as a pumping source. Moreover, SHG green laser of 3.1 cc is fabricated to gain output power of 2.8 mW using the wavelength locking with an optical bandpass filter as a wavelength selective optical component, which has advantages as more compactness and less accurate alignment.
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Yasuo Kitaoka, Yasuo Kitaoka, Kiminori Mizuuchi, Kiminori Mizuuchi, Kazuhisa Yamamoto, Kazuhisa Yamamoto, Makoto Kato, Makoto Kato, Wang Long Zhou, Wang Long Zhou, Takatomo Sasaki, Takatomo Sasaki, } "Compact SHG green lasers", Proc. SPIE 2682, Laser Diodes and Applications II, (12 April 1996); doi: 10.1117/12.237673; https://doi.org/10.1117/12.237673
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