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.
L. Bansal, R. Sienkowski, C. Neale, J. Mann, and C. Headley, "Uncooled pump combiners for fiber laser and amplifier systems," Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 105130V (Presented at SPIE LASE: February 01, 2018; Published: 20 February 2018); https://doi.org/10.1117/12.2289972.
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