百飞秒级脉宽的宽带超连续谱光源的产生  

Generation of Broadband Supercontinuum Source with Pulse Width of One Hundred Femtosecond

作　　者：刘正一 刘双龙[1] 黄艾旺 刘伟[1] 陈丹妮[1] LIU Zheng-yi;LIU Shuang-long;HUANG Ai-wang;LIU Wei;CHEN Dan-ni(Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Gruangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen,Gruangdong 518060,China)

机构地区：[1]深圳大学物理与光电工程学院光电子器件与系统(教育部/广东省)重点实验室,广东深圳518060

出　　处：《光子学报》2020年第9期27-34,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.11774242,61705144,61235012,61335001);国家重点基础研究发展计划(Nos.2012CB825802,2015CB352005);国家重大科学仪器设备开发专项(No.2012YQ15009203);深圳市科技计划(Nos.JCYJ20170818142804605,JCYJ20160308104404452)。

摘　　要：实现了一种适合于相干拉曼光谱探测的宽带超连续谱光源的方法,使用1 064nm飞秒激光泵浦全正色散光子晶体光纤,并用光栅对对脉冲进行压缩,最终获得了脉宽178fs,频谱范围处于760~1 300nm的超连续谱光源.对超连续谱脉冲的时间频谱结构进行了分析,未经过压缩的超连续谱的脉冲宽度达到1.43ps,不同频率的成分之间延迟较大,但基本上呈线性平滑分布,因此可以使用光栅对进行色散补偿;此外,提高泵浦光的功率虽然能够增加光谱展宽,但会引入高阶色散,并不利于色散补偿.最后,使用该超连续谱搭建的三色相干反斯托克斯拉曼散射光谱探测系统,测量了苯甲腈溶液的相干反斯托克斯拉曼散射信号光谱,同时获得了3 200cm-1范围内的所有振动模式,验证了该超连续光谱的性能.A method of generating broadband supercontinuum pulses is proposed,and it is a prefer light source for coherent Raman spectroscopy.A 1 064 nm femtosecond laser was used to pump the normal dispersion photonic crystal fiber,and then a pair of gratings was used to compress the pulse.Then a supercontinuum light source with a pulse width of 178 fs and a spectral range of 760~1 300 nm was obtained.The temporary spectrum structure of the supercontinuum pulse was analyzed.The results demonstrated that its spectrum is basically linearly and smoothly distributed,but the pulse width reaches1.43 ps,and the time delay between different spectral frequencies is quite large.Therefore,apair of gratings is used for dispersion compensation.In addition,although increasing the power of pump light can increase the spectral broadening,it will also introduce higher-order dispersion,which will increase complexities to the following dispersion compensation.In the end,to verify the performance of the supercontinuum in Coherent Anti-stokes Raman Scattering(CARS),three-color CARS spectrum detection system was built using the supercontinuum,and the CARS spectrum of the benzonitrile solution was measured,and all vibration modes in the range of 3 200 cm-1 was obtained simultaneously.

关 键 词：超连续光谱 非线性光学 光子晶体光纤 超短脉冲 光谱探测 

分 类 号：O433.54[机械工程—光学工程]