Accession Number : ADD005659

Title :   Converging Wave Unstable Resonator.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Chodzko,Richard A ; Mason,Stephen B

Report Date : 21 Nov 1978

Pagination or Media Count : 11

Abstract : An unstable resonator is disclosed that couples power out of an annular gain region in a single transverse mode through the use of spherical mirrors. A four-element cavity comprising a confocal unstable resonator with a double-sided 45 output coupling mirror in conjunction with a flat feedback mirror is used. A flat, totally reflecting feedback mirror is placed on the normally plane wave output side of the confocal cavity, forming an annular mode between the feedback mirror and the coupling mirror. A plane annular wave is fed back into the resonator, which alternately converges and diverges to produce an output beam in the form of a diverging annular beam. The converging wave unstable cavity has the novel property whereby increasing geometric magnification corresponds to increasing saturation of the active medium, in contrast to a conventional edge-coupled unstable cavity. (Author)

Descriptors :   *Patents, *Cavity resonators, *Laser cavities, *Optical equipment, Stability, Convergence, Mirrors, Spheres

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE