17 May 2010 Optical parametric oscillators with high pulse energy and beam quality
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Abstract
A new method for obtaining high beam quality from high pulse energy optical parametric oscillators (OPOs) is demonstrated. By using different nonlinear crystals that have walk-off in orthogonal directions but are type 2 phase matched for the same interaction, the strong beam asymmetry that is common in critically type 2 phase matched OPOs is removed. Experimentally, this was demonstrated by adding BBO crystals to a type 2 phase matched KTA OPO, where the beam quality improved from M2 ≈ 2 x 12 in the KTA OPO to M2 ≈ 2 x 2 from the KTA-BBO OPO.
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Gunnar Rustad, Gunnar Rustad, Øystein Farsund, Øystein Farsund, Gunnar Arisholm, Gunnar Arisholm, } "Optical parametric oscillators with high pulse energy and beam quality", Proc. SPIE 7721, Solid State Lasers and Amplifiers IV, and High-Power Lasers, 77210J (17 May 2010); doi: 10.1117/12.854958; https://doi.org/10.1117/12.854958
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