title: Passively Q-switched quasi-three-level laser and its intracavity frequency doubling.
abstract: A passively Q-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.
authors.affiliation: Institute of Electro-Optical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan.
authors.forename: Chun-Wei
authors.initials: CW
authors.lastname: Wang
authors.forename: Yi-Lung
authors.initials: YL
authors.lastname: Weng
authors.forename: Pi-Ling
authors.initials: PL
authors.lastname: Huang
authors.forename: Huy-Zu
authors.initials: HZ
authors.lastname: Cheng
authors.forename: Sheng-Lung
authors.initials: SL
authors.lastname: Huang