Kalyoncu Salıh K, Mete Busra, Yenıay Aydın
Opt Lett. 2020 Apr 1;45(7):1870-1873. doi: 10.1364/OL.387230.
In this Letter, we have demonstrated a triple-cladded fiber (TCF)-based master oscillator power amplifier (MOPA), with an output power scaling up to 4.67 kW, an optical-to-optical efficiency of 78%, and a beam quality factor ${{\rm M}^2}$M of 1.57. The MOPA output power was limited by stimulated Raman scattering (SRS) of which our design yielded a 31.2 dB suppression ratio at the 4.67 kW output power. Such a unique design of a TCF-based structure allows a wide range of flexibility over fiber parameters, mitigation of nonlinear effects, low-loss splice integration, reliable high-power pump guiding in turn, and an ease in overall thermal management at multi-kW output power levels. Together with direct diode-pumping configuration, TCF-based designs promise thermally and mechanically robust, compact, and highly efficient MOPA systems of a superior beam quality.
在本信函中，我们展示了一种基于三包层光纤（TCF）的主振荡功率放大器（MOPA），其输出功率高达4.67千瓦，光光效率为78%，光束质量因子M²为1.57。MOPA的输出功率受受激拉曼散射（SRS）限制，在4.67千瓦输出功率下，我们的设计产生了31.2分贝的抑制比。这种基于TCF结构的独特设计在光纤参数方面具有广泛的灵活性，可减轻非线性效应，实现低损耗熔接集成，进而实现可靠的高功率泵浦光导，并便于在多千瓦输出功率水平下进行整体热管理。结合直接二极管泵浦配置，基于TCF的设计有望实现热稳定性和机械稳定性好、紧凑且高效的MOPA系统，其光束质量优异。
