We have demonstrated efficient, high-energy, narrow-spectral-bandwidth pulse generation by use of periodically poled devices with a length and a large aperture. A free-running degenerated optical parametric oscillator (OPO) pumped with a Q-switched Nd:YAG laser exhibits a high slope efficiency of 75% and an optical-to-optical conversion efficiency of 70% with a broad spectral bandwidth . In a configuration with a spectrally narrowed master oscillator followed by a power amplifier, we have achieved an output pulse energy of with a spectral bandwidth of less than at the degeneracy point. The total optical-to-optical conversion efficiency of the system reached 50%.
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