Abstract

The design of a diode stack end-pumped multipass $\mathrm{Nd}:{\mathrm{YVO}}_4$ slab laser amplifier based on a stable and off-axis positive-branch confocal unstable hybrid resonator was demonstrated. Without the use of active switching elements, the hybrid resonator of the amplifier permits high multipass amplification of Q-switched laser beams in a compact package. The pulse energy of $3.8\mathrm{mJ}$ and pulse width of $5\mathrm{ns}$ was obtained at a repetition of $1\mathrm{kHz}$ with the amplification factor of 11. In cw operation, the maximum output power of $35.2\mathrm{W}$ was obtained by amplifying the seeder power of $4\mathrm{W}$. The beam propagation factor $M^2$ in both the cw and pulse models was under 1.3.

© 2007 Optical Society of America

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