级联掺Yb增益光纤提高拍频信号信噪比的实验研究

发布时间：2018-04-05 23:15

本文选题：掺Er光纤飞秒激光器　切入点：光谱增强　出处：《物理学报》2017年02期

【摘要】：飞秒光学频率梳的出现使对未知激光的绝对频率测量成为可能,极大地简化了激光绝对频率的量值溯源和比对工作.为了保证测量数值的准确性,飞秒光学频率梳与未知激光的拍频信号fb的信噪比要求大于30 d B.针对碘稳频532 nm激光绝对频率测量的特定需求,以532 nm激光的基频光1064 nm激光的绝对频率测量为着眼点,本文采用303 MHz重复频率的掺Er光纤光学频率梳,首先通过激光放大和光谱展宽技术使光谱覆盖到1μm波段,然后采用级联掺Yb增益光纤技术,将扩谱后1μm波段的激光功率进行放大,提高了掺Er光纤光学频率梳扩谱后1μm波长附近的激光强度.采用碘稳频532 nm激光的基频光作为待测光源与飞秒光学频率梳进行拍频.实验表明,与未经过光谱增强的激光相比,光谱增强后的激光与1064 nm激光拍频信号的信噪比提高了5 d B,保持在35 d B附近.该技术有效地缓解了采用掺Er光纤光梳测量1064 nm激光绝对频率时对直接扩谱所获得的1μm波长激光的强度要求.
[Abstract]:The appearance of femtosecond optical frequency comb makes it possible to measure the absolute frequency of unknown laser, which greatly simplifies the tracing and comparison of the absolute frequency of laser.In order to ensure the accuracy of the measurement value, the SNR of femtosecond optical frequency comb and unknown laser beat signal fb is greater than 30 dB.Aiming at the specific demand of absolute frequency measurement of iodine stabilized 532nm laser, this paper focuses on the measurement of absolute frequency of 1064 nm laser with fundamental frequency of 532nm laser. The optical frequency comb of er doped fiber with 303 MHz repetition rate is used in this paper.First, the spectrum is covered to 1 渭 m band by laser amplification and spectral broadening, and then the laser power of 1 渭 m band is amplified by cascaded Yb-doped gain fiber technology.The laser intensity near 1 渭 m wavelength of er doped fiber optical frequency comb spread spectrum is improved.The fundamental frequency light of 532 nm laser with iodine stabilized frequency is used as the light source to be measured and the femtosecond optical frequency comb is used to beat the frequency.The experimental results show that the signal-to-noise ratio of the spectral enhanced laser and the 1064 nm laser beat signal is increased by 5 dB and kept around 35 dB compared with the laser without spectral enhancement.This technique effectively alleviates the intensity requirement of 1 渭 m wavelength laser obtained by direct spread spectrum measurement using er doped optical fiber comb to measure the absolute frequency of 1064 nm laser.
【作者单位】：清华大学精密仪器系激光与光子技术研究室;中国计量科学研究院时间频率计量研究所;
【基金】：清华大学自主科研计划——青年教师自主选题基础研究(批准号:20131089299) 质检公益性行业科研专项(批准号:201310007)资助的课题~~
【分类号】：TN253;TN24

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