Office National D'etudes Et De Recherches Aerospatiales (onera)

Office National D'etudes Et De Recherches Aerospatiales

Antoine Godard

Michel Lefebvre

Ajmal Mohamed

Myriam Raybaut

Bertrand Hardy

Nested-cavity optical parametric oscillator for fast frequency tuning including a source of pump radiation (f), a non linear crystal situated within two resonant cavities for the signal and complementary radiations of respective optical lengths land l. A doubly resonant resonator for a single pair of longitudinal signal and complementary modes is formed having a crystal of prismatic shape, the crystal () being moveable within the plane xz along a direction forming a non zero angle &#x3b2; with respect to the direction x. The value of &#x3b2; is fixed so that the movement of the crystal is accompanied by a change in the respective optical lengths land lof the two resonant cavities in a ratio such that the double resonance condition between the longitudinal modes of each cavity is maintained.

Nested-cavity optical parametric oscillator for fast frequency tuning

The invention applies to doubly resonant optical parametric oscillators comprising a non-linear crystal () through which pass a pump laser beam (f), a signal beam (f), and a complementary beam (f), and a device () that totally or partially reflects said beams emanating from the crystal such that, after reflection, they generate between them a relative phase-shifting value &#x394;&#x3a6;for a given functioning mode independent of the signal frequency or complementary frequency, and is characterized in that the reflecting device () is a metallic minor, or a combination of two scattering mirrors and a multilayer dielectric mirror placed downstream.

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Palaiseau, France

Antoine Godard