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Diode-pumped eye-safe laser source exceeding 1% efficiency

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Abstract

We describe an all-solid-state, diode-pumped, eye-safe laser source at 1.61 μm, based on a Nd:YAG laser and a noncritically phase-matched KTP optical parametric oscillator. Total energy conversion efficiencies of the 1.064-μm pump to 1.61-μm signal and 3.1-μm idler approach 50%, with 35% conversion to 1.61 μm alone. This device produces 1.6 mJ at 1.61 μm with a wallplug efficiency of 1.1% and is readily scalable to higher energies. Tunability over 1.6 to 1.54 μm is obtained by rotation of the KTP crystal about its z axis, with 1.54-μm output obtained for propagation along the y axis under noncritical phase matching.

© 1991 Optical Society of America

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