Advanced numerical simulations show that the performance of high pulse energy optical parametric oscillators (OPOs) based on quasi phase matched materials can be significantly improved by the use of a non-collinear pumping scheme in a RISTRA geometry. For a PPLN-based RISTRA OPO with a 4 mm diameter pump beam, the output beam quality was improved from M2 ~ 25 to M2 ~ 1.5 with 150 mrad external pump angle, while the decline in output energy was small.

© 2013 Optical Society of America

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