ND laser with co-doped ion(s) pumped by visible laser diodes

Details ND laser with co-doped ion(s) pumped by visible laser diodes ND laser with co-doped ion(s) pumped by visible laser diodes

1991-06-17

1993-04-06

Scott, Jr., Leon

Coherent light generators

Particular pumping means

372 68, 372 41, 372 71, 372 75, H01S 309

Patent

active

052009726

ABSTRACT:
The 1.06.mu. Nd transition in a co-doped Cr,Nd:Gd.sub.3 Sc.sub.2 Ga.sub.3 sub.12 (Cr,Nd:GSGG) gain element is obtained by diode pumping Cr.sup.3+ at 670 nm 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.mu. 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 Cr.sup.3+ 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 .mu.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.

REFERENCES:
patent: 4740975 (1988-04-01), Abrahams et al.
patent: 5090019 (1992-02-01), Scheps

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