| 摘要 |
PURPOSE:To obtain stable higher harmonic output light by providing an optical coupling part on a substrate on which a waveguide type harmonic generation part is formed and projecting laser light to said part. CONSTITUTION:Light guides 2, 3 are formed on the substrate 1 consisting of a single crystal such as LiNbO3. A prism 4 is disposed as the optical coupling part in tight contact with one end of the substrate 1. The laser light 5 is projected through the prism 4 to the waveguide 2 in this constitution. Combshaped electrodes 6 output a surface acoustic wave 7 according to the high frequency impressed thereto an change the refractive index of the substrate 1. Zero-order different light A and 1st-order diffracted light B are thereby generated from the laser light 5. The diffracted light B enters the waveguide 3 from a lens 9 thereafter and generates second-order higher harmonics C. The higher harmonics C are phase-matched within the substrate 1 and are outputted in said direction. the stable higher harmonic light is thus obtd. and the need for adjustment such as intricate positioning is eliminated. |
