Abstract:
Background High-power, wide-temperature-range fiber lasers offer exceptional environmental adaptability, making them highly promising for a wide range of specialized applications. Over the past few years, our research group has successively developed 1 kW and 2 kW fiber lasers capable of stable operation over a wide temperature range from −50 ℃ to 50 ℃.
Purpose To achieve fiber lasers capable of wide-temperature-range operation with higher power and higher conversion efficiency, our research group carried out the work shown in this paper.
Methods In this work, the optical architecture of the fiber laser was optimized by adopting the oscillator-amplifier-integrated configuration to enhance conversion efficiency. Meanwhile, the length and coiling parameters of the gain fiber were carefully designed to achieve single-mode output.
Results The experimental results show that stable laser output of no less than 3 kW is maintained throughout the entire temperature range; the maximum output power reaches approximately 3.6 kW near –30 ℃. The optical-to-optical conversion efficiency remains above 65% across the full temperature range, with a peak value of about 73%. The beam quality M2 is measured to be 1.35.
Conclusion This marks the first demonstration of a 3 kW-class fiber laser employing an oscillator-amplifier-integrated structure operating over such a wide temperature range, providing key technical support for all-terrain, all-weather operations in complex environments. Future work will focus on further improving output power, conversion efficiency, and system stability, as well as promoting its practical application.
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