Accession Number:

ADD005659

Title:

Converging Wave Unstable Resonator.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s):

Report Date:

1978-11-21

Pagination or Media Count:

11.0

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

Subject Categories:

  • Lasers and Masers
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE