公开(公告)号：US3617930A

公开(公告)日：1971-11-02

申请号：US3617930D

申请日：1969-03-24

Applicant: AMERICAN OPTICAL CORP

Inventor： SNITZER ELIAS ,  HOFFMAN FRANK W ,  GUERTIN NORMAND A

IPC: H01S3/11 ,  H01S3/05

CPC classification number: H01S3/115 ,  H01S3/025 ,  H01S3/0615 ,  H01S3/1124

Abstract: An elongated laser element is provided with a light energy reflective termination at one end and its opposite end is optically ground and polished normal to the axis of the element to provide a Fresnel-reflective termination at such other end. The laser is adapted to emit stimulated emissive radiation exiting as a beam through its Fresnel-reflective end, and a laser-light transmissive member is supported axially of the element in the path of the emitted beam of light energy. This member has at least one pair of at least partially reflective surfaces which receive laser-light energy from the laser element and reflectively return laser-light energy The path or paths traversed through this member by laser light reflected by one or more reflective surfaces of the member has or have a length equal to an odd integral number of quarter wavelengths at the wavelength of at least one preselected laser-light energy returned by the transmissive member to the laser element substantially augments the stimulated emission by the element of laser-light energy at the wavelength of each such preselected frequency component.