ND Laser with Co-Doped Ion(S) Pumped by Visible Laser Diodes.
Patent, Filed 17 Jun 91, patented 6 Apr 93,
DEPARTMENT OF THE NAVY WASHINGTON DC
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The l.06 microns Nd transition in a co-doped Cr,NdGd3Sc2Ga3Ol2 Cr,NdGSGG gain element is obtained by diode pumping Cr3 at 670 run and produces efficient, low threshold laser operation. Although co-doped Cr,NdGSGG 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 NDYAG laser. The consequent broad bandwidth tolerance of the Cr,NdGSGG 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 0.4cm.
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