Efficient quasi-continuous-wave and passively Q-switched laser operation of a Nd~(3+):BaGd_(2)(MoO_(4))_(4) cleavage plate

摘要

Pumped by a Ti:sapphire laser at 807 nm, efficient quasi-cw and passively Q-switched laser operations have been realized from a 1.1 mm thick, 1.2 at. percent Nd~(3+):BaGd_(2)(MoO_(4))_(4) cleavage plate in a plano-plano cavity. When the absorbed pump power was 1060 mW, the achieved maximum quasi-cw output power was 580 mW. The slope efficiency and absorbed pump threshold power were 60percent and 50 mW, respectively. Using a Cr~(4+):YAG crystal with an initial transmission of 85percent as the saturable absorber, a pulse laser with 3.0 (mu)J energy, 30 ns duration, and 52 kHz repetition rate has been obtained when the absorbed pump power was 1060 mW. The polarization characteristic and laser spectra of both the quasi-cw and passively Q-switched lasers have been measured.