Abstract

Pumped by a Ti:sapphire laser at $807\text{\hspace{0.17em} nm}$, efficient quasi-cw and passively Q-switched laser operations have been realized from a $1.1\text{\hspace{0.17em} mm}$ thick, 1.2 at. % ${\text{Nd}}^{3+}:{\text{BaGd}}_2{\left({\text{MoO}}_4\right)}_4$ cleavage plate in a plano–plano cavity. When the absorbed pump power was $1060\text{\hspace{0.17em} mW}$, the achieved maximum quasi-cw output power was $580\text{\hspace{0.17em} mW}$. The slope efficiency and absorbed pump threshold power were 60% and $50\text{\hspace{0.17em} mW}$, respectively. Using a ${\text{Cr}}^{\text{4+}}\text{:YAG}$ crystal with an initial transmission of 85% as the saturable absorber, a pulse laser with $3.0\mu \text{J}$ energy, $30\text{\hspace{0.17em} ns}$ duration, and $52\text{\hspace{0.17em} kHz}$ repetition rate has been obtained when the absorbed pump power was $1060\text{\hspace{0.17em} mW}$. The polarization characteristic and laser spectra of both the quasi-cw and passively Q-switched lasers have been measured.

© 2008 Optical Society of America

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