Non-collinear nanosecond optical parametric oscillator based on periodically poled LN with tilted domain walls |
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Authors: | X. Liang J. Bartschke M. Peltz J.A. L’huillier |
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Affiliation: | (1) Physics Department, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany;(2) Xiton Photonics GmbH, Opelstrasse 10, 67661 Kaiserslautern, Germany |
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Abstract: | We report on a non-collinear, 1064 nm pumped, 10 kHz repetition rate ns-OPO which consists of a 13 mm long periodically poled lithium niobate (PPLN) crystal in a hemispherical optical cavity. The non-collinear phase-matching is achieved by tilting the domains by 60° with respect to the pump beam. This phase-matching avoids back conversion of signal and idler radiation into pump radiation and thus improves the spatial quality of the generated OPO radiation considerably. At a pump power of 5.5 W the OPO provided a conversion efficiency of up to 34%. The generated OPO pulses with a total power of up to 1.85 W were emitted in an almost diffraction limited beam with a M2-value of 1.1. The beam quality did not change when the pump power was varied in the range of 2–5 W. PACS 42.65.-k; 42.65.Yj |
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