Device and method for wavelength conversion and BBO crystal for wavelength conversion

摘要

Laser light radiated from a laser device 12 enters a resonator 16, and an electric field applied to a BBO crystal 14 inside the resonator 16 modulates the resonance frequency of the resonator 16. The BBO crystal 14 has a modulation electrode 32 and a feedback electrode 34, and a photodetector 18 detects laser light modulated by the BBO crystal 14. A signal in proportion to an error in resonance frequency obtained from the photodetector 18 causes an electric field to be applied to the BBO crystal 14 via the electrode 32 to change the resonance length. Negative feedback control is thus provided to the resonance frequency of the resonator 16 which is determined by the electric field applied to the BBO crystal 14 to substantially eliminate error, thereby synchronizing the resonator 16.