Passive Q-switching operation has been demonstrated with a class of mixed $\mathrm{Nd}:{\mathrm{Lu}}_x{\mathrm{Gd}}_{1-x}{\mathrm{VO}}_4$ laser crystals. With respect to that obtained with $\mathrm{Nd}:{\mathrm{GdVO}}_4$ , the passive Q-switching performance, including threshold, pulse energy, and peak power, was found to be greatly enhanced with the mixed vanadate crystals. The shortest pulse width of $6.2\mathrm{ns}$ , largest pulse energy of $192.5\mathrm{\mu }\mathrm{J}$ , and highest peak power of $31.1\mathrm{kW}$ were obtained at the incident pump power of $13.75\mathrm{W}$ with the mixed crystal for $x=0.5$ .

© 2007 Optical Society of America

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