基于中空光子带隙光纤的飞秒激光脉冲压缩  

Femtosecond Pulse Compression through Hollow-Core Photonic Bandgap Fibers

作　　者：刘博文[1] 王清月[1] 徐博[1] 李毅[1] 宋有建[1] 张弛[1] 胡明列[1] 柴路[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院,光电信息技术科学教育部重点实验室,天津300072

出　　处：《中国激光》2009年第3期620-624,共5页Chinese Journal of Lasers

基　　金：国家973计划(2006CB806002);国家863计划(2007AA03Z447);国家自然科学基金(60678012,60838004);教 育部科学技术研究重点项目(108032);全国优秀博士学位论文作者专项资助项目(2007B34);教育部新世纪优秀人才支持计划(NCET-07-0597)资助课题

摘　　要：利用中空光子带隙光纤(HC-PBGF)对光子晶体光纤飞秒激光器输出的激光脉冲进行腔外再压缩。激光器输出的脉冲中心波长为1040 nm,脉冲宽度为475 fs,平均功率为400 mW,单脉冲能量为8 nJ。通过白光干涉法测量了中空光子带隙光纤的色散参数为一48 ps^2/km,并利用截断实验得到了所用光纤的最优化长度,压缩后获得的最短脉冲宽度为108 fs,接近变换极限,传输效率为89%。由于该光纤纤芯的非线性系数较低,脉冲在其中传输无非线性效应,压缩后输出光谱保持不变。The pulse compression for the femtosecond photonic crystal fiber laser is obtained by hollow core photonic bandgap fibers (HC-PBGF). The fiber laser directly outputs 475 fs pulses at a central wavelength of 1040 nm with an average power of 400 mW, corresponding to a pulse energy of 8 nJ. The dispersion of the HC-PBGF is measured with a white light interferometry method, which shows that the fiber has an abnormal dispersion of about -48 ps2/km and can be applied to compensate the positive chirp of femtosecond pulses from the fiber laser. After compression from the fiber with an optimized length, the pulses are compressed to 108 fs, which is close to Fourier transmission limitation. The transmission efficiency is about 89%, which is much better than a grating pair. The spectrum keeps the same as that of the input pulse after passing through the fiber, due to the low nonlinearity and bandgap properties of the HC-PBGF.

关 键 词：非线性光学 中空光子带隙光纤 脉冲压缩 飞秒激光 光子晶体光纤激光器 

分 类 号：O437[机械工程—光学工程]