中国激光, 2018, 45 (4): 0401010, 网络出版: 2018-04-13
结构紧凑的kHz重复频率光纤-固体皮秒激光光源 下载: 1339次
Compact Fiber-Solid Picosecond Laser Source with Kilohertz Repetition Rate
摘要
优化设计了光纤-固体皮秒激光光源中的窄光谱皮秒脉冲光纤激光振荡器及多级光纤放大器。光纤链路充分抑制了光纤中的放大自发辐射和非线性效应,以使系统工作在低至1 kHz重复频率时,仍能保持大于20 dB的光谱信噪比及小于0.5 nm的光谱带宽。采用三级双通Nd∶YVO4固体放大器对该光纤链路输出的皮秒脉冲进行了放大。当系统重复频率为1,10,100 kHz时,分别得到了2.34,4.30,10.30 W的平均功率输出,相应的单脉冲能量分别为2.34,0.43,0.10 mJ。在Nd∶YVO4晶体仅为被动散热的条件下,当系统的输出功率不超过7 W时,输出光束的质量因子M2<1.3、光斑圆度大于90%。
Abstract
Picosecond pulse fiber laser oscillator with narrow linewidth and multistage fiber amplifier which are used in the fiber-solid picosecond laser source are optimally designed. Spontaneous emission and nonlinear effect in the fiber are fully suppressed by fiber link, so that when the system operates at 1 kHz repetition rate, the spectral signal to noise ratio is still better than 20 dB and the spectral bandwidth is narrower than 0.5 nm. Furthermore, picosecond pulse generated from the fiber link is further amplified by a three-stage double-pass Nd∶YVO4 solid amplifier. The average output powers of the laser system are as high as 2.34, 4.30, 10.30 W, corresponding to 2.34, 0.43, 0.10 mJ single pulse energies at 1, 10, 100 kHz repetition rates. With only passively cooling on the Nd∶YVO4 crystals, beam quality M2 is less than 1.3 and beam roundness is more than 90% when the output power of system doesn′t exceed 7 W.
赵明, 郝强, 郭政儒, 曾和平. 结构紧凑的kHz重复频率光纤-固体皮秒激光光源[J]. 中国激光, 2018, 45(4): 0401010. Zhao Ming, Hao Qiang, Guo Zhengru, Zeng Heping. Compact Fiber-Solid Picosecond Laser Source with Kilohertz Repetition Rate[J]. Chinese Journal of Lasers, 2018, 45(4): 0401010.