Patent ID: 6816533
Filing Date: 2004-11-09
Classification: H01S

Abstract:
A laser oscillator comprising: a laser medium; an optical path passes through the laser medium; an optical excitation laser diode that irradiates the laser medium with light; a polarizer disposed on an optical axis of the laser medium at a first end thereof, a first Porro prism disposed with the optical path coinciding with a point on a ridgeline thereof and with the ridgeline parallel or perpendicular to a plane of incidence of the polarizer; a second Porro prism disposed on the optical axis of the laser medium at a second end thereof with the optical path coinciding with a point on a ridgeline thereof; an angle formed by the two ridgelines of the first and second Porro prisms being a predetermined angle other than 0 degrees, 90 degrees, 60 degrees, 45 degrees and 36 degrees, 30 degrees.