Abstract
A comparison of the room-temperature operation of diode-pumped continuous-wave thulium-doped YAP and YAG lasers is reported. A markedly superior conversion efficiency using 4.2% doped Tm:YAP was measured, 730 mW of laser output being generated with a 3 W pump diode, representing a 42% conversion of absorbed diode light to laser output. With 6% Tm:YAG, laser output was restricted to 270 mW, a 21% conversion efficiency. Both lasers were found to generate diffraction-limited output. Greater upconversion losses in YAG than YAP are proposed as a factor contributing to its poorer laser performance.
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