半导体直接泵浦3kW超宽温运行光纤激光器OA

[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.