Abstract

We have demonstrated efficient, high-energy, narrow-spectral-bandwidth $2.128\mu \mathrm{m}$ pulse generation by use of periodically poled $\mathrm{Mg}\mathrm{O}:\mathrm{Li}\mathrm{Nb}{\mathrm{O}}_3$ devices with a $36\mathrm{mm}$ length and a $5\mathrm{mm}\times 5\mathrm{mm}$ large aperture. A free-running degenerated optical parametric oscillator (OPO) pumped with a Q-switched $1.064\mu \mathrm{m}$ Nd:YAG laser exhibits a high slope efficiency of 75% and an optical-to-optical conversion efficiency of 70% with a broad spectral bandwidth $(>100\mathrm{nm})$. In a configuration with a spectrally narrowed master oscillator followed by a power amplifier, we have achieved an output pulse energy of $52\mathrm{mJ}$ with a spectral bandwidth of less than $2\mathrm{nm}$ at the degeneracy point. The total optical-to-optical conversion efficiency of the system reached 50%.

© 2006 Optical Society of America

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