Accession Number : ADD016381

Title :   Wavelength Dispersive Gain Element for a Tunable Laser.

Descriptive Note : Patent, Filed 20 May 93, patented 26 Apr 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Scheps, Richard

Report Date : 26 Apr 1994

Pagination or Media Count : 17

Abstract : A tunable laser is described in which the gain element is fabricated to produce wavelength dispersion within the laser resonator cavity. Specifically, the laser gain element has Brewster angled entrance and exit faces which allow it to operate as a wavelength dispersive element while simultaneously performing the functions of an optical gain element within a laser cavity. Wavelength tuning is effected by angular rotation of one of the end reflective elements in the cavity. By using suitable dispersive materials for the laser gain element no additional tuning elements are required providing high efficiency, low threshold laser operation for a variety of optical excitation methods. The laser gain element replaces other discrete intracavity laser tuning means required for tunable lasers, including prisms, diffraction gratings, and birefringent filter elements. Solid state crystalline laser gain elements which are doped with impurity ions for laser operation are highly suitable for this type of laser, as are ion doped glasses or other amorphous materials. In addition, a suitable laser gain element can be constructed of a hollow fluid-containing cell where the cell is fabricated in the shape of a Brewster dispersing prism and the cell is filled with a laser gain fluid such as a dye solution or a chelate solution. Optical exciting means and geometries are discussed, as are the conditions for minimizing astigmatism introduced by the prism

Descriptors :   *GAIN, *TUNABLE LASERS, *PATENTS, ASTIGMATISM, DIFFRACTION, DISPERSIONS, DYES, EXCITATION, GRATINGS(SPECTRA), IMPURITIES, IONS, LASER CAVITIES, LASERS, RESONATORS, SHAPE, PRISMS(OPTICS), CAVITY RESONATORS, DOPING, BIREFRINGENCE

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE