Laser has telescope which expands beam emitted from laser rod and reduces beam reflected by mirror through aperture

摘要

The laser has a resonator in which a laser rod (3) and a telescope (7) are arranged. The telescope is arranged between the laser rod and an aperture in front of a resonator mirror (12). The laser rod is pumped by an index pump device. The telescope expands the cross-section (15) of the laser beam (13) emitted from the laser rod, and reduces the cross-section of the reflected laser beam emitted from the resonator mirror through the opening (11) of the aperture (10).