Balakin Alexey, Skobelev Sergey, Andrianov Alexey, Anashkina Elena, Litvak A G
Opt Lett. 2024 Mar 15;49(6):1500-1503. doi: 10.1364/OL.514070.
The process of Raman frequency shifting of out-of-phase laser pulses in fibers with a square configuration of weakly coupled cores having two or more zero dispersion wavelengths has been studied. The use of out-of-phase distributions in multicore fibers makes it possible to increase pulse energies by orders of magnitude in comparison with the case of single-core fibers. Conditions for the stability of out-of-phase laser pulses are determined and confirmed by numerical simulations. A configuration of chalcogenide multicore fiber with three zero dispersion wavelengths is proposed, allowing ultra-broadband frequency shifting of laser pulses up to 6.2 m with an energy efficiency of more than 25%.
研究了具有两个或更多零色散波长的弱耦合纤芯方形配置光纤中异相激光脉冲的拉曼频移过程。与单芯光纤相比，在多芯光纤中使用异相分布能够将脉冲能量提高几个数量级。通过数值模拟确定并证实了异相激光脉冲的稳定性条件。提出了一种具有三个零色散波长的硫属化物多芯光纤配置，可实现高达6.2米的激光脉冲超宽带频移，能量效率超过25%。
