A passively <i>Q</i>-switched quasi-three-level Nd:YAG laser is intracavity frequency doubled to generate a blue laser. The 473-nm blue laser has a peak power of 37 W and a pulse width of 23 ns at a pumping power of 1.6 W. To model this laser numerically, we developed rate equations by taking into consideration both the quasi-three-level nature of the gain medium and the four-level nature of the saturable absorber. Good agreement was achieved between experimental and simulated results for both the fundamental and the second-harmonic output. The reabsorption loss of the gain medium is estimated under pulsed operation.
© 2002 Optical Society of America
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3540) Lasers and laser optics : Lasers, Q-switched
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.5940) Nonlinear optics : Self-action effects
Chun-Wei Wang, Yi-Lung Weng, Pi-Ling Huang, Huy-Zu Cheng, and Sheng-Lung Huang, "Passively Q-Switched Quasi-Three-Level Laser and Its Intracavity Frequency Doubling," Appl. Opt. 41, 1075-1081 (2002)