Accession Number : AD0165080

Title :   Tunable Internal-Feedback Liquid Crystal-Dye Laser.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Goldberg,Lawrence S. ; Schnur,Joel M.

Report Date : 06 NOV 1973

Pagination or Media Count : 4

Abstract : The patent describes a liquid lasing medium of a mixture of a fluorescent dye and a cholesteric liquid crystal which provides internal distributed feedback for the lasing light without the use of a mirror system. It is used in a tunable distributed-feedback dye laser. The internal feedback in this device arises from backward Bragg scattering produced in the lasing medium by introducing a spatial variation of refractive index or gain. This is accomplished by pumping the dye with the fringes formed by the interference of two coherent beams. Spectral tuning is achieved by varying the angle at which the two pump beams interfere in order to change the periodicity of the fringes.

Descriptors :   *Patents, *Liquid crystals, *Dye lasers, *Cholesteryl esters, *Tunable lasers, Fluorescent dyes, Feedback

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE