Accession Number : ADD015803

Title :   Tm:YALO, 1.94-Micron, Solid State Laser.

Descriptive Note : Patent application, filed 28 Apr 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Esterowitz, Leon ; Stoneman, R

Report Date : 28 Apr 1993

Pagination or Media Count : 18

Abstract : A thulium-doped solid state laser is provided capable of operation at a wavelength having a shallow absorption depth in tissue. The laser is comprised of a laser cavity defined by first and second reflecting surfaces opposing each other on an optical axis, a thulium-doped YALO crystal disposed in the cavity, and a pump source for pumping the crystal with a pump beam at a preselected wavelength to enable the crystal to emit a most preferred 1.94 micron laser output. The thulium-doped YALO crystal is preferably an a-cut crystal. Such alignment of this material provides a reliable mode at 1.94 microns with has excellent tissue absorption characteristics for medical applications. The length 1 of the crystal, the concentration N of the dopant and the transmissivity T of the output coupler, which define an expressing N1/T, can be varied as long as the expression N1/T produces a value which does not exceed about 0.32 centimeters

Descriptors :   *SOLID STATE LASERS, *LASER PUMPING, *MEDICINE, *PATENT APPLICATIONS, THULIUM, TUNABLE LASERS, LASER CAVITIES, CRYSTALS, DOPING, REFLECTIVITY, LASER APPLICATIONS, YAG LASERS, SEMICONDUCTOR DIODES, SEMICONDUCTOR LASERS

Subject Categories : Lasers and Masers
      Medicine and Medical Research
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE