A 400W cryogenic Er:YAG laser at 1645 nm

Scott D. Setzler; Michael J. Shaw; Mark J. Kukla; Josef R. Unternahrer; Kenneth M. Dinndorf; James A. Beattie; Evan P. Chicklis

doi:10.1117/12.855614

4 May 2010 A 400W cryogenic Er:YAG laser at 1645 nm

Scott D. Setzler, Michael J. Shaw, Mark J. Kukla, Josef R. Unternahrer, Kenneth M. Dinndorf, James A. Beattie, Evan P. Chicklis

Author Affiliations +

Proceedings Volume 7686, Laser Technology for Defense and Security VI; 76860C (2010) https://doi.org/10.1117/12.855614
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

We report on the design and characterization of a cryogenically cooled, resonantly pumped Er:YAG slab laser operating at 1645 nm. The Er:YAG slab is conductively cooled by liquid nitrogen and face-pumped by a 1.4 kW diode array operating at 1452 nm. The slab is transversely extracted in a highly multi-mode oscillator, producing 386 W of cw output power and 420 W of quasi-cw power at 50% duty cycle. We have measured 45% slope efficiency and 39% optical conversion efficiency (relative to incident pump). The laser has also been configured to operate with low-order multi-mode output, producing over 250 W of quasi-cw power at 25% duty cycle, and has been Q-switched at repetition rates as low as 10 kHz.

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Scott D. Setzler, Michael J. Shaw, Mark J. Kukla, Josef R. Unternahrer, Kenneth M. Dinndorf, James A. Beattie, and Evan P. Chicklis "A 400W cryogenic Er:YAG laser at 1645 nm", Proc. SPIE 7686, Laser Technology for Defense and Security VI, 76860C (4 May 2010); https://doi.org/10.1117/12.855614

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