Patent ID: 9071036
Filing Date: 2015-06-30
Classification: H01S

Abstract:
1. A laser apparatus comprising: an optical resonator including a mirror configured to reflect a part of light and a grating; a laser chamber configured to emit a laser beam by a power source and a laser gain medium provided in the optical resonator; an optical loss adjustment mechanism provided in the optical resonator and configured to adjust an optical loss of the laser beam; and a spectral line width adjustment mechanism provided in the optical resonator and configured to adjust a spectral line width of the laser beam, wherein the optical loss adjustment mechanism and the spectral line width adjustment mechanism form an integrated mechanism including a beam width expansion prism and a dispersion prism, wherein a partially reflective film is formed on an entrance surface of the dispersion prism where the laser beam enters, and wherein the integrated mechanism is configured to switch a first state in which the beam width expansion prism is placed on an optical path of the laser beam and a second state in which the dispersion prism is placed on the optical path of the laser beam so as to adjust the spectral line width of the laser beam.