Accession Number : ADD015711

Title :   ND Laser with Co-Doped Ion(S) Pumped by Visible Laser Diodes.

Descriptive Note : Patent, Filed 17 Jun 91, patented 6 Apr 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Scheps, Richard

Report Date : 06 Apr 1993

Pagination or Media Count : 11

Abstract : The l.06 microns Nd transition in a co-doped Cr,Nd:Gd3Sc2Ga3Ol2 (Cr,Nd:GSGG) gain element is obtained by diode pumping Cr3+ at 670 run and produces efficient, low threshold laser operation. Although co-doped Cr,Nd:GSGG was developed for more efficient flashlamp pumping, it has the desirable property of having an extraordinarily broad absorption to allow for efficient diode pumping relative to the ND:YAG laser. The consequent broad bandwidth tolerance of the Cr,Nd:GSGG for the diode pumping radiation allows diode pumping of the 1.06 microns transition without regard to the wavelength of the visible diodes which has the potential for reducing the cost of the semiconductor pump and also demonstrates the extended versatility of these diodes which previously had been restricted to pump the Cr3+ tunable vibronic lasers. CW and long pulse diode pumping provided pump power levels as high as 300 mW cw and 1 W pulsed. The lowest threshold power was measured at 938 micron W and the highest output power was obtained at 43 mW cw and 173 mW pulsed. The best slope efficiency obtained was 42.1%, 78% of the theoretical maximum. Loss measurements indicate a value of 0.4%/cm.

Descriptors :   *DIODES, *YAG LASERS, ABSORPTION, BANDWIDTH, EFFICIENCY, GAIN, LASERS, MEASUREMENT, POWER LEVELS, PULSES, PUMPING, RADIATION, SEMICONDUCTORS, TRANSITIONS, NEODYMIUM LASERS

Subject Categories : Electrical and Electronic Equipment
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE