Dr. Fan Chen Profile

Dr. Fan Chen

at Nanjing Univ of Science and Technology

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Proceedings Article | 18 December 2019 Paper

6.2 kW spectral beam combination by means of edge filters

Fan Chen, Jun Ma, Rihong Zhu, Cong Wei

Proceedings Volume 11333, 1133306 (2019) https://doi.org/10.1117/12.2538291

KEYWORDS: Optical filters, Fiber lasers, High power lasers, High power fiber coupled lasers, High power fiber lasers

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In this paper, we demonstrate a spectral beam combining scheme of two ytterbium-doped fiber lasers, running at different wavelengths. An edge filter with high damage threshold (>20 MW/cm² ) and steep rising edge (<2 nm) is employed as the combining element to overlap the two output beams in the near and far fields. 6.2 kW combined output power is achieved with an efficiency of 97%, which proves the high efficiency of the filter for both the reflection and transmission cases. Despite the broad emission spectrum of the single channel, the beam quality of the output is approximate with the incident emitters in horizontal and vertical directions. In terms of the measurement result conducted with thermal imaging camera, the growth of temperature on the edge filter during the combining process is well within the acceptable range. Compared with the grating based spectral beam combining (SBC) schemes, it permits the efficient combining of broader spectrum and arbitrarily large beams, which shows the potential of the filter-based spectral beam combination system. Scaling by additional and more powerful channels, higher combined output power appears to be feasible.

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