Abstract

We demonstrate a Q-switched, cladding-pumped, Nd:Al-doped silica depressed clad hollow optical fiber (DCHOF) laser, which generated up to $133\mu \mathrm{J}$ of pulse energy at a repetition rate of $5\mathrm{kHz}$ and $0.9\mathrm{W}$ of average output power at a high repetition rate $(>20\mathrm{kHz})$ in a diffraction-limited beam $(M^2=1.08)$ at $927\mathrm{nm}$. The laser was tunable from $919\text{to}935\mathrm{nm}$. This result shows the potential of the DCHOF structure for the suppression of unwanted long-wavelength radiation in large-area cores suitable for high-power Q-switched laser operation.

© 2006 Optical Society of America

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