Patent ID: 8542435
Filing Date: 2013-09-24
Classification: G02F

Abstract:
1. A doubly resonant optical parametric oscillator with achromatic phase-maintaining pump reflection comprising: a pump radiation source at a frequency f a non linear crystal having a front face and a rear face, an achromatic mirror situated downstream of the rear face of the crystal, defining with a first mirror situated on the front face of the crystal, a first resonant cavity for the radiation signal at the frequency f a second resonant cavity for the complementary radiation at the frequency f a backward path entering via the rear face of the crystal, the optical indices of which are respectively n wherein the crystal is moveable in translation in the plane xz along a direction inclined by a non zero angle b with respect to the direction x such that with to modify simultaneously the respective optical lengths l s and l c of the two resonant cavities in a ratio such that the double resonance for a single pair of longitudinal signal and complementary modes is maintained, and as a result the values of the frequencies f s and f c are continuously tunable over a wide range.