Patent ID: 9685753
Date: 2017-06-20
CPC Classifications: G02F,H01S

Claim:
1. A method of tuning an optical parametric oscillator, OPO, in which different signal/idler beams combinations are selected by varying the temperature of a non-linear element in the OPO, one of said signal/idler beams being a selected resonant wavelength in said OPO, and narrow-band operation is effected by varying the temperature of a birefringent element in a birefringent filter in the OPO in order for a transmission peak of the birefringent filter to match the selected resonant wavelength; wherein at least two different selected resonant wavelengths obtained at two different temperatures of the non-linear element are matched by a transmission peak of the birefringent filter at a single temperature of the birefringent element; and wherein a first rate at which the resonant wavelength is shifted when varying the temperature of the non-linear element is larger than a second rate at which a transmission peak of the birefringent filter is shifted in wavelength when varying the temperature of the birefringent element.