20 February 2018 Uncooled pump combiners for fiber laser and amplifier systems
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Abstract
In this work we demonstrate a high transmission pump combiner that can operate uncooled at a maximum power of 400W for a continuous duration of 100hrs. The 7x1 pump combiner has seven 105/125 μm diameter 0.22 NA input pump fibers and a 247 μm diameter and 0.22 NA glass clad output fiber. The combiner has a high, 99%, pump transmission efficiency. These devices withstand without failure, a series of environmental stress tests, namely Thermal Cycling (-40 to 85ºC) and Damp Humidity (85ºC/85RH). These tests are conducted to uncover any latent defects in the device structure. The combiner’s also survive an elevated temperature of 75ºC at a power of 365W for duration of 5hrs, without any noticeable change in pump transmission.
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L. Bansal, L. Bansal, R. Sienkowski, R. Sienkowski, C. Neale, C. Neale, J. Mann, J. Mann, C. Headley, C. Headley, } "Uncooled pump combiners for fiber laser and amplifier systems", Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 105130V (20 February 2018); doi: 10.1117/12.2289972; https://doi.org/10.1117/12.2289972
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