Patent ID: 7324267

Claim:
A wavelength converter device for generating a converted radiation at frequency ω g through interaction between at least one signal radiation at frequency ω s and at least one pump radiation at frequency ω p , comprising: an input for said at least one signal radiation at frequency ω s ; a pump light source for generating said at least one pump radiation at frequency ω p ; an output for taking out said converted radiation at frequency ω g ; and a structure for transmitting said signal and pump radiation, said structure including an optical resonator comprising a non-linear material, having an optical length of at least 40*λ/2, wherein λ is the wavelength of the pump radiation, and resonating at the pump, signal and converted frequencies ω p , ω s and ω g ; said structure comprising a further optical resonator coupled in series to said optical resonator, said further optical resonator comprising a non-linear material, having an optical length of at least 40*λ/2, wherein λ is the wavelength of the pump radiation, and resonating at the pump, signal and converted frequencies ω p , ω s and ω g , and wherein by propagating through said structure, the pump and signal radiation generate said converted radiation by non-linear interaction within each of said optical resonators.