Accession Number : ADD017931

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

Descriptive Note : Patent, Filed 28 Apr 93, patented 17 Oct 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Esterowtiz, Leon ; Stoneman, Robert C

Report Date : 17 Oct 1995

Pagination or Media Count : 7

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 which 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 expression NI/T, can be varied as long as the expression NI/T produces a value which does not exceed about 0.32 centimeters.

Descriptors :   *SOLID STATE LASERS, *PATENTS, *THULIUM, LASER CAVITIES, OUTPUT, SOURCES, OPTICAL PROPERTIES, CRYSTALS, REFLECTION, SURFACES, MEDICINE, RELIABILITY, DOPING, ABSORPTION, PUMPS, COUPLERS, SHALLOW DEPTH, TRANSMISSIVITY

Subject Categories : Lasers and Masers
      Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE