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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 dB.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1 μm波段,然后采用级联掺Yb增益光纤技术,将扩谱后1 μm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1 μm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 dB,保持在35 dB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1 μm波长激光的强度要求.
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关键词:
- 掺Er光纤飞秒激光器 /
- 光谱增强 /
- 拍频信号 /
- 光纤光学频率梳
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[1] Ma L S, Zucco M, Picard S, Robertsson L, Windeler R S 2003 IEEE J. Sel. Top. Quantum. Electron. 9 1066
[2] Ma L S, Robertsson L, Picard S, Chartier J M, Karlsson H, Prieto E, Windeler R S 2003 IEEE. Trans. Instrum. Meas. 52 232
[3] Millo J, Boudot R, Lours M, Bourgeois P Y, Luiten A N, Coq Y L, Kersalé Y, Santarelli G 2009 Opt. Lett. 34 3707
[4] Peng J L, Ahn H, Shu R H, Chui H C, Nicholson J W 2007 Appl. Phys. B 86 49
[5] Klose A, Ycas G, Maser D L, Diddams S A 2014 Opt. Express 22 28400
[6] Washburn B R, Diddams S A, Newbury N R, Nicholson J W, Yan M F, Jørgensen C G 2004 Opt. Lett. 29 250
[7] Liu H, Cao S Y, Meng F, Lin B K, Fang Z J 2015 Acta Phys. Sin. 64 094204 (in Chinese)[刘欢,曹士英,孟飞,林百科,方占军2015物理学报64 094204]
[8] Liu H, Cao S Y, Meng F, Lin B K, Fang Z J 2015 Laser Phys. 25 075105
[9] Lea S N, Rowley W R C, Margolis H S, Barwood G P, Huang G, Gill P, Chartier J M, Windeler R S 2003 Metrologia 40 84
[10] Eickhoff M L, Hall J L 1995 IEEE Trans. Instrum. Meas. 44 155
[11] Diddams S A, Jones D J, Ye J, Cundiff S T, Hall J L, Ranka J K, Windeler R S, Holzwarth R, Udem T, Hänsch T W 2000 Phys. Rev. Lett. 84 5102
[12] Lin B K, Cao S Y, Zhao Y, Li Y, Wang Q, Lin Y G, Cao J P, Zang E J, Fang Z J, Li T C 2014 Chinese J. Lasers 41 0902002 (in Chinese)[林百科,曹士英,赵阳,李烨,王强,林弋戈,曹建平,臧二军,方占军,李天初2014中国激光41 0902002]
[13] Kharenko D S, Podivilov E V, Apolonski A A, Babin S A 2012 Opt. Lett. 37 4104
[14] Li C, Ma Y X, Gao X, Niu F Z, Jiang T X, Wang A M, Zhang Z G 2015 Appl. Opt. 54 8350
[15] Chen W, Song Y, Jung K, Hu M L, Wang C Y, Kim J 2016 Opt. Express 24 1347
[16] Xie C, Liu B W, Niu H L, Song Y J, Li Y, Hu M L, Zhang Y G, Shen W D, Liu X, Wang C Y 2011 Opt. Lett. 36 4149
[17] Wang S J, Liu B W, Gu C L, Song Y J, Qian C, Hu M L, Chai L, Wang C Y 2013 Opt. Lett. 38 296
[18] Ycas G, Osterman S, Diddams S A 2012 Opt. Lett. 37 2199
[19] Kieu K, Jones R J, Peyghambarian N 2010 Opt. Express 18 21350
[20] Kim Y, Kim Y J, Kim S, Kim S W 2009 Opt. Express 17 18606
[21] Alder F, Diddams S A 2012 Opt. Lett. 37 1400
[22] Klose A, Ycas G, Cruze F C, Maser D L, Diddams S A 2016 Appl. Phys. B 122 77
[23] Liu H, Gong M L, Cao S Y, Lin B K, Fang Z J 2015 Acta Phys. Sin. 64 114210 (in Chinese)[刘欢, 巩马理, 曹士英, 林百科, 方占军2015物理学报64 114210]
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