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An Optical Parametric Oscillator Laser (OPOL)

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Abstract

OPOs pumped external to the laser cavity suffer from inefficiencies due to phase distortions and optical losses caused by various intervening optical components and the single pass nature of the pump laser. The internal cavity OPO has the advantage of a lower OPO threshold by multi–passing the pump. However, previous internal cavity OPOs still have multiple surfaces that the pump must pass in order to pump the OPO. In order to circumnavigate these effects, the doping of a non-linear material such that it would lase and parametrically oscillate was investigated. By using 0.13% Nd2O3 and 3.0% MgO doped LiNbO3 and pumping at 813 nm1 with laser diodes, an optical parametric oscillator laser (OPOL) was constructed. A schematic of the prototype OPOL is shown in Figure 1.

© 1994 Optical Society of America

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