High-brightness 1.4 kW 780 nm QCW laser pump module with low-loss coupling into 1 mm fiber up to 50% duty cycle

Marko Hübner; Martin Wilkens; Bernd Eppich; P. Simon Basler; Andre Maaßdorf; Dominik Martin; Andrea Knigge; Arnim Ginolas; Sabrina Kreutzmann; Paul Crump

doi:10.1117/12.2608625

4 March 2022 High-brightness 1.4 kW 780 nm QCW laser pump module with low-loss coupling into 1 mm fiber up to 50% duty cycle

Marko Hübner, Martin Wilkens, Bernd Eppich, P. Simon Basler, Andre Maaßdorf, Dominik Martin, Andrea Knigge, Arnim Ginolas, Sabrina Kreutzmann, Paul Crump

Author Affiliations +

Proceedings Volume 11983, High-Power Diode Laser Technology XX; 1198309 (2022) https://doi.org/10.1117/12.2608625
Event: SPIE LASE, 2022, San Francisco, California, United States

Abstract

The performance characteristics of two stack modules (emitting near 780 nm) each consisting of 24 wide-aperture (1200 μm) diode laser chips is presented and the results are discussed. The stack modules are constructed using diode lasers from two different epitaxial design iterations. Compared to the first iteration, the second iteration was optimized for higher conversion efficiency and optical in-pulse power (lower losses), without compromising the beam characteristics. The stack modules make use of an established (field-proven) FBH design that utilizes innovative edge-cooling of both sides of the diode stack with large-channel (micro-channel free), water-cooled, thermally-expansion-matched heatsinks. We investigate here their performance up to high duty cycles and results for pulse width up to 10 ms at high duty cycle (50 %) operation is presented. Test of the completed modules show that the iteration 2 (power-optimized) chips deliver about 15 % more optical power without compromising the beam propagation ratio. Specifically, the stack module with first iteration chips delivers approx. 1.4 kW whereas the stack module with the optimized chips delivers approx. 1.6 kW. For the stack module that uses the first chip iteration a fiber coupling to a 1 mm core fiber was demonstrated with approx. 90 % coupling efficiency and loss channels are discussed. Finally, very high duty cycle operation (50 %) is demonstrated for the first time, using an iteration 1 stack module.

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Marko Hübner, Martin Wilkens, Bernd Eppich, P. Simon Basler, Andre Maaßdorf, Dominik Martin, Andrea Knigge, Arnim Ginolas, Sabrina Kreutzmann, and Paul Crump "High-brightness 1.4 kW 780 nm QCW laser pump module with low-loss coupling into 1 mm fiber up to 50% duty cycle", Proc. SPIE 11983, High-Power Diode Laser Technology XX, 1198309 (4 March 2022); https://doi.org/10.1117/12.2608625

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