天津大学精密仪器与光电子工程学院超快激光研究室, 光电信息技术教育部重点实验室, 天津 300072
利用解析方法研究了父脉冲参数对合成脉冲宽度和质量的影响。研究结果表明,两个父脉冲具有相近的脉冲宽度和脉冲能量时,合成脉冲的时域质量较高。减小父脉冲时域宽度可以有效减小合成脉冲基底。为了验证这一相干脉冲合成的优化方法,在不同的非线性光纤中,对分束后的掺镱光纤飞秒激光器的输出脉冲分别进行非线性频率变换,获得了两个小于30 fs的脉冲,再将二者进行相干脉冲合成,获得了合成脉冲宽度为8 fs的少周期脉冲。
非线性光学 光纤 激光 超快激光 脉冲压缩
Author Affiliations
Abstract
Ultrafast Laser Laboratory, School of Precision Instrument and Optoelectronics Engineering, Key Laboratory of Optoelectronic Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
We demonstrate a coherent synthesis system based on femtosecond Yb-doped fiber laser technology. The output pulse of the amplification system is divided into two replicas and seeded into photonic crystal fibers of two parallel branches for nonlinear pulse compression. Because of the different nonlinear dynamics in the photonic crystal fibers, the compressed pulses show different spectra, which can be spliced to form a broad coherent spectrum. The integrated timing jitter between the pulses of two branches is less than one tenth of an optical cycle. By coherently synthesizing pulses from these two branches, 8 fs few-cycle pulses are produced.
140.3490 Lasers, distributed-feedback 060.2420 Fibers, polarization-maintaining 060.3735 Fiber Bragg gratings Chinese Optics Letters
2019, 17(4): 041403
