| 摘要 |
PURPOSE:To improve efficiency at a time when the sum-frequency laser beams and/or difference-frequency laser beams of first and second laser beams are generated remarkably by arranging a nonlinear type optical crystal element into the resonator of first laser beams while satisfying the conditions of external resonance to second laser beams by the resonator. CONSTITUTION:Laser beams L4 for converting a wavelength emitted from a second semiconductor laser 12 for converting the wavelength are projected to a beam splitter 11 through an objective 13, and a nonlinear type optical crystal element 7 is selected at a specified azimuth phi=68-73[deg] to the oscillation laser beams L2 of an Nd:YAG laser 6 projected and the laser beams L4 for converting the wavelength emitted from the semiconductor laser 12 for converting the wavelength. Accordingly, the light intensity of the second laser beams L4 projected to the nonlinear type optical crystal element 7 can be increased remarkably, thus acquiring sum-frequency laser beams L5 and differential-frequency laser beams with high efficiency. |
