超短激光脉冲应用中的重频及重频差锁定技术研究
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摘要
超短激光脉冲的高精度重复频率以及重频差锁定在光通信、距离测量以及光频梳等研究领域都有着重要应用。目前,商用重复频率及重频差锁定仪器仅可用于各公司自己的激光器,不具有通用性且价格较为昂贵;并且,同一台仪器无法同时用于实现重复频率及重频差的锁定。实验研究了超短激光脉冲应用中的重频及重频差锁定技术。实验中,通过直接将鉴相器后的混频信号输入到伺服控制系统中反馈控制激光器腔长,实现了重复频率锁定,锁定精度与商用重复频率锁定仪器相当。进一步使用自制的基于FPGA的频转压模块置于伺服控制器前端,实现了对重复频率锁定以及重频差的灵活切换锁定,大大降低成本的同时提高了使用灵活性。该频转压模块由于内部需要模拟信号转数字频率以及频率转电压的线性转换过程,会引入误差,因此锁定精度较商用仪器低一个量级,后期可通过对内部系统优化进一步提高锁定精度。
The high-precision repetition rate and repetition rate difference stabilization of ultra-short pulse lasers have important applications in the field of optical communication,distance measurement and optical frequency comb.Though there are already commercial equipments provided for stabilization of repetition rate and repetition rate difference with a timing jitter as small as sub-picosecond,their high costs and incompatibility with different femtosecond laser systems limit their applications.In this paper,we demonstrate a high-precision repetition rate locking by simply feeding the output phase detection signal after passing through the servo control system back,which shows almost equivalent performance as the commercial one.Then by injecting the self-developed frequency to voltage conversion module in front of the servo control system,both the repetition rate locking of a femtosecond pulse laser and repetition rate difference between two femtosecond lasers are realized.Since the frequency to voltage conversion module requires an internal linear analog to digital conversion process which can introduce errors,the stabilization precision is one order of magnitude lower than that of the commercial one.By optimizing the conversion process of the module,the stabilization precision can be improved.Such self-developed module provides us a cost-effective and flexible solution for the repetition rate and repetition rate difference stabilization.
The high-precision repetition rate and repetition rate difference stabilization of ultra-short pulse lasers have important applications in the field of optical communication,distance measurement and optical frequency comb.Though there are already commercial equipments provided for stabilization of repetition rate and repetition rate difference with a timing jitter as small as sub-picosecond,their high costs and incompatibility with different femtosecond laser systems limit their applications.In this paper,we demonstrate a high-precision repetition rate locking by simply feeding the output phase detection signal after passing through the servo control system back,which shows almost equivalent performance as the commercial one.Then by injecting the self-developed frequency to voltage conversion module in front of the servo control system,both the repetition rate locking of a femtosecond pulse laser and repetition rate difference between two femtosecond lasers are realized.Since the frequency to voltage conversion module requires an internal linear analog to digital conversion process which can introduce errors,the stabilization precision is one order of magnitude lower than that of the commercial one.By optimizing the conversion process of the module,the stabilization precision can be improved.Such self-developed module provides us a cost-effective and flexible solution for the repetition rate and repetition rate difference stabilization.
引文
[1]MILLOT G,PITOIS S,MING Y,et al.Frequency-agile dual-comb spectroscopy[J].Nature Photonics,2016,10(1):27-30.
[2]CINGOZ A,YOST D C,ALLISON T K,et al.Direct frequency comb spectroscopy in the extreme ultraviolet[J].Nature,2012,482(7383):68-71.
[3]JOO K N,KIM S W.Absolute distance measurement by dispersive interferometry using a femtosecond pulse laser[J].Opt.Express,2006,14(13):5954-5960.
[4]CODDINGTON I,SWANN W C,NENADOVIC L,et al.Rapid and precise absolute distance measurements at long range[J].Nature Photonics,2009,3(6):351-356.
[5]樊珊珊.原子层二硫化钼的光致发光及动力学过程研究[D].武汉:华中科技大学,2015.
[6]HADJILOUCAS S,WALKER G C,BOWEN J W,et al.High signal to noise ratio THz spectroscopy with ASOPS and signal processing schemes for mapping and controlling molecular and bulk relaxation processes[J].Journal of Physics:Conference Series,2009,183(1):012003.
[7]ADLER F,MOUTZOURIS K,LEITENSTORFER A,et al.Phase-locked two-branch erbium-doped fiber laser system for long-term precision measurements of optical frequencies[J].Opt.Express,2004,12(24):5872-5880.
[8]SHEN Xu-ling,HE Bo-qu,ZHAO Jian,et al.Repetition rate stabilization of an erbium-doped all-fibre laser via opto-mechanical control of the intracavity group velocity[J].Applied Physics Letters,2015,106(3):031117.
[9]吴学健,李岩,尉昊赟,等.飞秒光学频率梳在精密测量中的应用[J].激光与光电子学进展,2012,49(3):1-10.
[10]赵春播,武腾飞,梁志国.飞秒激光器脉冲重复频率的锁定技术研究[J].计测技术,2014,34(6):22-25.
[11]ZHANG Hong-yuan,WEI Hao-yun,WU Xue-jian,et al.Absolute distance measurement by dual-comb nonlinear asynchronous optical sampling[J].Opt.Lett,2014,22(6):6597-6604.
[12]高锐.基于FPGA的多周期同步频率计设计[D].长春:吉林大学,2013.
[13]白巍凯,刘涛,董瑞芳,等.一种应用于偏频锁定激光系统的多功能测频电路[J].时间频率学报,2017(1):1-10.
[2]CINGOZ A,YOST D C,ALLISON T K,et al.Direct frequency comb spectroscopy in the extreme ultraviolet[J].Nature,2012,482(7383):68-71.
[3]JOO K N,KIM S W.Absolute distance measurement by dispersive interferometry using a femtosecond pulse laser[J].Opt.Express,2006,14(13):5954-5960.
[4]CODDINGTON I,SWANN W C,NENADOVIC L,et al.Rapid and precise absolute distance measurements at long range[J].Nature Photonics,2009,3(6):351-356.
[5]樊珊珊.原子层二硫化钼的光致发光及动力学过程研究[D].武汉:华中科技大学,2015.
[6]HADJILOUCAS S,WALKER G C,BOWEN J W,et al.High signal to noise ratio THz spectroscopy with ASOPS and signal processing schemes for mapping and controlling molecular and bulk relaxation processes[J].Journal of Physics:Conference Series,2009,183(1):012003.
[7]ADLER F,MOUTZOURIS K,LEITENSTORFER A,et al.Phase-locked two-branch erbium-doped fiber laser system for long-term precision measurements of optical frequencies[J].Opt.Express,2004,12(24):5872-5880.
[8]SHEN Xu-ling,HE Bo-qu,ZHAO Jian,et al.Repetition rate stabilization of an erbium-doped all-fibre laser via opto-mechanical control of the intracavity group velocity[J].Applied Physics Letters,2015,106(3):031117.
[9]吴学健,李岩,尉昊赟,等.飞秒光学频率梳在精密测量中的应用[J].激光与光电子学进展,2012,49(3):1-10.
[10]赵春播,武腾飞,梁志国.飞秒激光器脉冲重复频率的锁定技术研究[J].计测技术,2014,34(6):22-25.
[11]ZHANG Hong-yuan,WEI Hao-yun,WU Xue-jian,et al.Absolute distance measurement by dual-comb nonlinear asynchronous optical sampling[J].Opt.Lett,2014,22(6):6597-6604.
[12]高锐.基于FPGA的多周期同步频率计设计[D].长春:吉林大学,2013.
[13]白巍凯,刘涛,董瑞芳,等.一种应用于偏频锁定激光系统的多功能测频电路[J].时间频率学报,2017(1):1-10.