Optical parametric oscillations of 2 μm in multiple-layer bonded walk-off compensated KTP stacks

摘要

Spatial walk-off can severely increase the threshold of critical phase-matched optical parametric oscillationsn(OPOs) and distort the output beam quality. With 16-layer KTP stacks for walk-off compensation, noncriticalnphase-match-like (NCPM-like) and quasi-phase-match-like OPOs with enhanced angular acceptance havenbeen demonstrated based on two different KTP bonding orientations. In the NCPM-like composite, outputnpulse energy of 49 u0001J has been achieved at pump energy of 523 u0001J with pulse duration of 15 ns and repetitionnrate of 1 KHz. The OPO threshold as low as 254 u0001J u000144.6 MW/cm2u0002 has been achieved. © 2010 OpticalnSociety of America