| 摘要 |
PURPOSE:To optimize an optical length even with the rough accuracy of a movement of a laser device or a nonlinear optical device by providing a particular slanting surface on a light incident surface or a light exit surface of at least either of time laser device or the nonlinear optical device. CONSTITUTION:There are in a resonator a laser device 2 for generating fundamental laser light with excitation thereof, and a nonlinear optical device 3 for emitting second harmonic laser light as the fundamental laser light is incident thereon. There is provided a slanting surface 30 satisfying a formula (lambda: wavelength of fundamental laser light, DELTAn: double refraction of a slanting surface formation device with respect to the fundamental laser light, DELTAW: amount of the movement of the device in the width direction on which the slanting surface is formed, tau: slanting angle) on the light exit surface of the nonlinear optical device 3, which slanting surface is moved widthwise thereof for effective adjustment of the optical length. Hereby, even though the movement accuracy in the width direction is set somewhat roughly, the optical length is optimized. |
