摘要
高功率中红外光纤激光器在基础科学研究、大气通信、环境监测和国防安全等领域有着重要应用。拉曼光纤激光技术是实现中红外激光的一种重要手段,通过级联拉曼运转可在光纤透过窗口内输出任意波长激光。目前,以碲酸盐、氟化物或硫系玻璃光纤作为拉曼增益介质,研究者分别研制出工作波长为3.77μm的二级级联拉曼激光器和波长调谐范围覆盖2~4.3μm的中红外拉曼孤子光纤激光光源。最近,本研究组制备出一种具有高稳定性、高抗激光损伤阈值、大拉曼频移和高拉曼增益系数的氟碲酸盐玻璃光纤,并以其作为拉曼增益介质,先后实现了波长调谐范围覆盖1.96~2.82μm的中红外拉曼孤子激光以及~3μm处的"拉曼孤子雨",初步验证了该氟碲酸盐玻璃光纤在中红外拉曼光纤激光器方面的应用潜力。主要对国内外中红外拉曼光纤激光光源的研究进展进行了总结,介绍了碲酸盐、氟化物、硫系以及氟碲酸盐玻璃光纤材料的特点及相应的拉曼光纤激光器,并对发展趋势进行了展望。
Significance High power mid-infrared(MIR)fiber lasers have important applications in fundamental research,atmospheric communications,environmental monitoring,national defense & security,and so on.Raman fiber lasers and rare earth ions doped fiber lasers are two key technologies for MIR laser generation.Now,3-4μm fiber lasers have been demonstrated based on rare earth ions doped fluoride glass fibers.Whereas,due to the narrow and isolated emission bands of rare earth ions,the operational wavelengths of rare-earth-doped fiber lasers cannot cover all wavelengths in the MIR region.Moreover,the obtained output power decreases with the increase of operational wavelength due to the low emission efficiency and large quantum defects in the MIR region for rare earth ions.Raman fiber lasers are realized based on the stimulated Raman scattering(SRS)effects in optical fibers.SRS is an important nonlinear optical process in optical fibers.When the pump laser is launched into the fiber core,it would interact with the medium,and be scattered to Stokes light with a longer operational wavelength.The frequency difference between the pump and Stokes light is named as Raman shift.The generated Stokes light can serve as the pump light and cause the generation of next order Stokes light with a longer operational wavelength,which means that cascaded operation can be achieved for Raman fiber lasers.That is to say,if there is pumping light with a suitable wavelength and an infrared glass fiber with a low loss and high laser damage threshold,fiber lasers operating at any wavelength within the transmission window of the glass matrix can be achieved based on the Raman shift and cascaded Raman operation in principle,which is inaccessible for rare earth ion doped fiber lasers.Since then,to explore glass fibers with wide MIR transmission windows,good stabilities,high laser damage thresholds,big Raman shifts,and large Raman gain coefficients has been of great significant for the development of high power MIR fiber lasers.Progress By using silic
作者
贾志旭
郭晓慧
焦亚东
秦伟平
秦冠仕
Jia Zhixu;Guo Xiaohui;Jia Yadong;Qin Weiping;Qin Guanshi(State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun,Jilin 130012,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2022年第1期60-75,共16页
Chinese Journal of Lasers
基金
国家自然科学基金(62090063,62075082,U20A20210,61827821)。
