Being the optical module which has the cubic measure die phase grid and the cubic measure die phase grid which possesses the production

摘要

PROBLEM TO BE SOLVED: To solve the problem wherein, especially in the case that light having a wavelength near the oscillation wavelength of a semiconductor laser 12 enters the semiconductor laser 12 directly, the oscillation wavelength becomes unstable under the influence and the spectrum property and the output of the laser become unstable.;SOLUTION: This volume type phase grating has phase gratings which have periodic refractive index variation, respectively, and is characterized in that respective phase gratings are inclined at a prescribed angle β to an incident plane.;COPYRIGHT: (C)2004,JPO&NCIPI