Abstract
Abstract Diode-pumped continuous-wave (CW) and passively Q-switched composite Nd:YVO 4 lasers are presented by using Cr 4+ :YAG as saturable absorber. The temperature distributions and thermal focal lengths in three Nd:YVO 4 crystals are numerically analyzed by a finite element method and the results show that diffusion-bonding composite crystals can effectively reduce the thermal lens effect. CW and passively Q-switched laser performances are experimentally investigated. The maximum CW output power of 3.35 W with an optical slope efficiency of 54.6% was obtained by Nd(0.1 at%):YVO 4 /Nd(0.5 at%):YVO 4 /Nd(1.0 at%):YVO 4 composite crystal under an incident pump power of 6.52 W. The largest single pulse energy of 4.4 μJ with a pulse duration of 22 ns at a 166 kHz pulse repetition rate was also achieved.
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