| 摘要 |
PURPOSE:To use a small-sized, low-output semiconductor laser, etc., and the exciting light of continuous oscillation and to obtain high conversion efficiency by using a resonator and a nonlinear optical material. CONSTITUTION:Nonlinear optical crystal 1, mirrors 2 and 3 which constitute the resonator, and an optical waveguide 4 are united. The length L of the nonlinear optical crystal 1 is so designed that incident laser beam 5 generates a standing wave in the optical waveguide and nonlinear optical crystal 1. A mirror M12 constituting an optical resonator has a >=99.8% reflection factor to laser beam 5 and a >=99.8% reflection factor at a frequency 6 twice as high as that of the laser beam, but a mirror [M2]3 has >=99% transmissivity to the frequency 6 twice as high as that of the laser beam. Consequently, beam from the semiconductor laser is used as the exciting light to obtain >=30% high conversion efficiency to a 2nd harmonic. |
