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
Original Manuscript: August 2, 1991
Published: November 1, 1991
Larry R. Marshall, Jeff Kasinski, and Ralph L. Burnham, "Diode-pumped eye-safe laser source exceeding 1% efficiency," Opt. Lett. 16, 1680-1682 (1991)