13 May 2016 Fiber-coupled modules producing >300W and >600W from a 225 micron fiber, with <0.7 kg/kW weight-power ratio
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Abstract
Specifically optimized for both high efficiency and low SWaP, DILAS Diode Laser, Inc. continues to improve and optimize high-brightness fiber-laser pump modules. Starting with a <53% electrical-optical efficient 330W module in full production, power-scaled versions capable of 625 W and 900 W will also be covered. Utilizing a 225um/0.22 NA fiber output, these pumps enable single-mode kW-class fiber amplifiers ranging from 1 kW to 3kW. Designed for low SWaP, these modules are produced using mounted diode laser bars from a standard manufacturing line and commercial, off-theshelf optics. Cooling is accomplished through macro channel coolers that eliminate the need for micro-channels and the associated coolant issues. This innovative macro channel cooler is specifically designed to reduce both weight and thermal resistance, and also provides an ideal substrate for power-scaling the diode module while maintaining efficiency. Utilizing AuSn hard solder on CTE matched substrates eliminates the problems associated with Indium-based diode solder joints and permits hard pulsing of the laser diodes with any pulse width/duty cycle parameter set. Optional VBG stabilization is available on all versions for applications requiring wavelength stability over a wide temperature range.
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Chris Ebert, David Irwin, Tina Guiney, Dean Stapleton, Steve Patterson, "Fiber-coupled modules producing >300W and >600W from a 225 micron fiber, with <0.7 kg/kW weight-power ratio", Proc. SPIE 9834, Laser Technology for Defense and Security XII, 98340I (13 May 2016); doi: 10.1117/12.2222908; https://doi.org/10.1117/12.2222908
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