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| NALM锁模全保偏光纤掺铒光学频率梳 |
| All-PM fiber, Erbium-doped frequency comb based on a NALM mode-locked fiber laser |
| 投稿时间：2018-04-27 |
| DOI：10.3969/j.issn.1005-5630.2019.02.007 |
| 中文关键词: 光学频率梳 全保偏光纤 光纤激光器 超连续谱产生 频率锁定 |
| 英文关键词:optical frequency comb all polarization-maintaining fiber fiber lasers supercontinuum generation frequency stabilization |
| 基金项目:国家重大仪器专项（2012YQ15009205） |
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| 中文摘要: |
| 飞秒光学频率梳是当今激光技术领域的重要研究方向。实验基于非线性放大环形镜（NALM）锁模激光器实现了全保偏光纤结构的掺铒光学频率梳。在基于NALM锁模的光纤激光器内部加入非互惠相移器，降低了锁模阈值，实现了超短脉冲激光器的自启动。经过脉冲放大和压缩，脉冲的峰值功率可达61.3 kW。将此高功率超短脉冲注入55 cm的保偏高非线性光纤（PM-HNLF）中，激光器的输出光谱被拓展至一个倍频层（1 030～2 200 nm）。辅以f-2f自参考探测技术，成功探测到了信噪比高达40 dB、线宽为40 kHz的载波包络偏频信号（f0）。此外，通过使用两套电路反馈系统，将f0信号与激光器重复频率信号（fr）的频率抖动量分别降低至521.71 mHz和240 μHz，实现了相位稳定的掺铒光学频率梳。 |
| 英文摘要: |
| Femtosecond optical frequency comb has been a rich research field in laser optics. We demonstrated an all polarization-maintaining (PM) fiber, Erbium-doped frequency comb based on a nonlinear amplification loop mirror(NALM) mode-locked fiber laser. An integrated nonreciprocal phase shifter was employed in a passively mode-locked NALM-based oscillator to reduce the mode locking threshold and facilitate self-starting. Being amplified and pulse compressed, the peak power of the pulses can achieve as high as 61.3 kW. Injecting the high-power ultrashort pulses into a 55-cm-long PM high nonlinear fiber (HNLF), an octave-spanning supercontinuum from 1 030 nm to 2 200 nm was generated. By using a collinear f-2f interferometer, the carrier-envelop offset signal (f0) with 40-dB signal-to-noise ratio (SNR) and 40-kHz linewidth was detected. Moreover, with the employment of two feedback locking electronics, the f0 signal and the repetition rate of the laser (fr) were phase-locked and it showed the standard deviations of 521.71 mHz and 240 μHz, respectively. |
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