Abstract

We have demonstrated efficient, high-energy, narrow-spectral-bandwidth 2.128μm pulse generation by use of periodically poled MgO:LiNbO3 devices with a 36mm length and a 5mm×5mm large aperture. A free-running degenerated optical parametric oscillator (OPO) pumped with a Q-switched 1.064μm Nd:YAG laser exhibits a high slope efficiency of 75% and an optical-to-optical conversion efficiency of 70% with a broad spectral bandwidth (>100nm). In a configuration with a spectrally narrowed master oscillator followed by a power amplifier, we have achieved an output pulse energy of 52mJ with a spectral bandwidth of less than 2nm 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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