Patent ID: 7630124

Claim:
A wavelength conversion device comprising: at least a fundamental wave light source and an external resonator, wherein a reflectance R in of an input coupling element that inputs light from the fundamental wave light source to the external resonator is selected as represented by the equations 1 and 2, when a frequency jitter of the fundamental wave light source is Δf jitter , a resonator length of the external resonator is L cav , a frequency line width of the external resonator is Δν cav , a total internal loss of the external resonator is δ, and a speed of light is c. Δ ⁢ ⁢ v cav = c L cav × 1 - R i ⁢ ⁢ n ⁡ ( 1 - δ ) π ⁡ ( R i ⁢ ⁢ n ⁡ ( 1 - δ ) ) 1 / 4 ( 1 ) Δ ⁢ ⁢ v cav ≧ Δ ⁢ ⁢ f jitter ( 2 )