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5 September 2002 Laser-diode-pumped Cr:YAG passively Q-switched green laser by intracavity frequency doubling with periodically poled LiNbO3
Shaojun Zhang, Xiangang Xu, Chunming Dong, Qingpu Wang, Xingyu Zhang, Ping Li, Fujun Zhang, Shengzhi Zhao
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Proceedings Volume 4914, High-Power Lasers and Applications II; (2002) https://doi.org/10.1117/12.481761
Event: Photonics Asia, 2002, Shanghai, China
Abstract
A continue-wave (CW) laser-diode (LD) pumped passively Q-switched intracavity frequency-doubling green laser is reported in this paper. We used 3%at. Nd doped YVO4 with size of 3 X 3 X 1mm as gain medium, Cr4+:YAG as a saturable absorber with small-signal transmission T0=94% for passively Q-switch and periodically poled LiNbO3 (PPLN) with the grating period ? =6. 1 µm as a frequency doubler. The laser cavity was consisted of one face of the Nd:YVO4, coated high-reflectance (HR) coating at 1.06 µm and high transmittance (HT) at 0.808 µ m, and a 50mm radius of curvature output mirror with HR coating at 1.06 1 µm and HT coating at 0.53 µm.. A CW 1W LD and a grading-refractive-index lens were used for the end-pumping. The output energy of the green laser is 0.96 µ J with the pulse-width of 19ns. No green-noise problem exists in the green laser, because both the polarizations of fundamental wave and second harmonic wave are the same. Some theoretical results on the passively Q-switching and intracavity frequency-doubling are also reported.
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Shaojun Zhang, Xiangang Xu, Chunming Dong, Qingpu Wang, Xingyu Zhang, Ping Li, Fujun Zhang, and Shengzhi Zhao "Laser-diode-pumped Cr:YAG passively Q-switched green laser by intracavity frequency doubling with periodically poled LiNbO3", Proc. SPIE 4914, High-Power Lasers and Applications II, (5 September 2002); https://doi.org/10.1117/12.481761
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KEYWORDS
Q switched lasers
Crystals
Coating
Nonlinear crystals
Optical pumping
Laser crystals
Mirrors
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