Patent ID: 7349149
Filing Date: 2008-03-25
Classification: G02F

Abstract:
1. A doubly-resonant optical parametric oscillator ( 5 ) that includes a non-linear crystal, an incoming pump radiation that makes a single forward journey through the crystal and emerges from the latter by its rear face, a signal radiation and a complementary radiation that make many two-way trips through the crystal, with these last two rays reconverting into a reverse pump radiation during their return journeys through the crystal, a device that reflects a fraction of the intensity of the pump radiation coming out of the rear face of the crystal so that, at the output of the crystal, the phase relation φ p −φ s −φ p =0 [2π] is verified, where φ p and φ s are the phases of the pump radiation, characterised in that the reflected fraction of the intensity of the pump radiation, called matched pump recycling, is close to or even equal to the intensity of the reverse pump radiation in the absence of the reflecting device.