基于光学谐振腔的可调谐滤波器特性研究  

Characterization of a tunable optical filter based on a passive cavity for femtosecond lasers

作　　者：项晓[1,2,3] 侯飞雁 权润爱[1,2,3] 董瑞芳 刘涛[1,2,3] 张首刚 XIANG Xiao;HOU Fei-yan;QUAN Run-ai;DONG Rui-fang;LIU Tao;ZHANG Shou-gang(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Time and Frequency Primary Standards,Chinese Academy of Sciences,Xi’an 710600,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 101048,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院时间频率基准重点实验室,西安710600 [3]中国科学院大学天文与空间科学学院,北京101048

出　　处：《时间频率学报》2020年第3期169-174,共6页Journal of Time and Frequency

基　　金：国家自然科学基金资助项目(61875205;91836301;61801458);中组部“青年拔尖人才”支持计划资助项目(中组字〔2013〕33号);中国科学院前沿科学重点研究资助项目(QYZDB-SSWSLH007);中国科学院“西部之光”人才培养计划“西部青年学者”B类资助项目(XAB2019B15;XAB2019B17);中国科学院战略性先导科技专项C类资助项目(XDC07020200)。

摘　　要：光学谐振腔作为激光科学领域一个重要的器件,广泛应用于非线性光学、量子光学及光频标等方面。在这些应用中,光学谐振腔可以被用作一个低通滤波器过滤激光噪声或者带通滤波器来选取特定的光谱成分。基于谐振腔次共振的机理,提出了一种应用于飞秒脉冲激光的可调谐滤波器的实现方案,并在实验上对其滤波特性进行了研究。采用Pound-Drever-Hall(PDH)技术将腔长锁定到了主共振峰及3个不同的次共振峰上,分别测量了不同透射峰的相对强度噪声及共振光谱特性。实验结果表明,通过锁定共振腔长到不同的共振峰,谐振腔对输入激光弛豫振荡峰的抑制能力可从16.1 dB减小为11.5 dB;相应的3 dB光谱滤波带宽可由全通变窄至2.30 nm。基于光学谐振腔的可调谐滤波器的实现将进一步拓展光学谐振腔在飞秒激光领域的应用范围。The optical cavity has been recognized as a basic and important element in areas of laser science,such as nonlinear optics,quantum optics,and optical frequency standards.Among these applications,the optical cavity can be used as a low-pass filter for laser noise or band-pass filter to select specific spectral component.Based on the mechanism of cavity secondary resonance,a tunable hybrid optical filter combined low-pass noise and band-pass spectral filtering for femtosecond lasers was proposed and its filtering characteristics were studied experimentally.Here,the cavity was stabilized in one main and three secondary resonance peaks with the Pound-Drever-Hall(PDH)technique and then the relative intensity noise(RIN)and optical spectra were recorded and analyzed.The experimental results show that,the tunability of the cavity-based filter can be identified by their different attenuations,which vary from 16.1 dB to 11.5 dB,of the relaxation oscillation peak in the laser RIN,along with the 3 dB bandwidths of the spectral filter tuning from all-pass to 2.30 nm under different resonance conditions.The realization of the cavity-based tunable optical filter would help to find more applications in fields with femtosecond lasers.

关 键 词：飞秒激光 光学谐振腔 可调谐滤波器 强度噪声 

分 类 号：TN713[电子电信—电路与系统] TN241