一种全保偏光纤型高效宽带红外DFG光梳  

An all-polarization-maintaining fiber-type infrared DFG comb with wide bandwidth and high conversion efficiency

作　　者：马金栋 路桥 段典 姚波 毛庆和 MA Jindong;LU Qiao;DUAN Dian;YAO Bo;MAO Qinghe(School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei 230026,China;Anhui Provincial Key Laboratory of Photonics Devices and Materials,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]中国科学技术大学环境科学与光电技术学院,安徽合肥230026 [2]中国科学院安徽光学精密机械研究所安徽省光子器件重点实验室,安徽合肥230031

出　　处：《量子电子学报》2019年第4期428-433,共6页Chinese Journal of Quantum Electronics

基　　金：中国科学院战略性先导科技专项(B类),XDB21010300;国家自然科学基金,61377044,61805258;国家重点研发计划,2017YFB0405100~~

摘　　要：报道了一种基于锁模掺铒光纤激光器和GaSe晶体的光纤型宽带高效差频产生(DFG)光梳。该DFG光梳采用全保偏光纤设计以获得高线偏振度的基频脉冲,采用非线性脉冲光纤放大技术以获取宽带窄脉宽高峰值功率的双色基频脉冲,从而确保了DFG光梳的宽带和高转换效率特性以及DFG过程的稳定性。该DFG光梳在中心波长8.15μm处带宽达1.7μm,仅受GaSe晶体相位匹配接受带宽的限制,对应的DFG转换效率达1%,远高于常规光纤型DFG光梳约0.4%的转换效率。A broadband difference frequency generation(DFG)comb with high conversion efficiency based on a mode-locked erbium-doped fiber laser and GaSe crystal is presented.The DFG comb adopts allpolarization-maintaining fiber structure to obtain fundamental frequency pulses with high linear polarizations degrees,and the nonlinear pulse fiber amplification technique is utilized to achieve wide bandwidths,short durations and high peak powers,for the two-color fundamental pulses.This offers the DFG comb the properties of wide bandwidth and high conversion efficiency,and the stability of the DFG process.The experimental results show that the achievable bandwidth of the DFG comb near 8.15 μm reaches 1.7μm,only limited by the phase-matching acceptance bandwidth of the crystal,and the corresponding DFG conversion efficiency is as high as 1%,much higher than that for the fiber-type DFG comb reported so far,which is about 0.4%.

关 键 词：激光技术 光学频率梳 差频产生 保偏光纤 激光脉冲 

分 类 号：O437[机械工程—光学工程]