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低频压缩态光场的制备

刘增俊 翟泽辉 孙恒信 郜江瑞

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低频压缩态光场的制备

刘增俊, 翟泽辉, 孙恒信, 郜江瑞

Generation of low-frequency squeezed states

Liu Zeng-Jun, Zhai Ze-Hui, Sun Heng-Xin, Gao Jiang-Rui
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  • 低频压缩态光场可用于提高引力波探测器灵敏度, 近年来受到人们的广泛关注. 相对于高频段而言, 低频压缩态的产生更容易受到外界环境噪声的干扰而不易被观察到. 本文采用全固化单频倍频Nd: YVO4/KTP激光器作为光源, 利用双波长共振的光学参量振荡器实现参量过程, 以1064 nm波长的红外作为基频光, 激光器腔内倍频产生的532 nm绿光作为抽运光, 通过调节周期性极化磷酸氧钛钾晶体温度使光学参量振荡器达到双波长同时共振, 采用真空注入的方式, 利用Pound-Drever-Hall锁腔技术锁定抽运场. 输出压缩光通过平衡零拍探测, 最终在实验上获得了频率低至3 kHz的真空压缩, 所直接观察到的压缩度为2 dB.
    Squeezed state of light is an important resource of optical measuerments below the shot noise limit and has been used to improve measurement sensitivity in many areas such as gravitational wave detection, especially in audio frequency region. Compared with the high-frequency squeezed states, the generation of the low-frequency squeezed states is more difficult, because it is limited by several technical noise sources. In this paper we report the observation of more than 2 dB of vacuum squeezing at 1064 nm in the gravitational-wave detection band down to 3 kHz with a double-resonant optical parametric oscillator (OPO). The OPO has a configuration of linear cavity consisting of an input coupling mirror with a transmission of 11% at 532 nm and an output coupling mirror with the transmission of 12% at 1064 nm. The nonlinear materials in the OPO is type-I periodically poled potassium titanyl phosphate (PPKTP) crystal which is chosen for this experiment due to its higher nonlinearity, broader phase matching temperature, and smaller photo-thermal effect. The OPO is pumped by the light of 532 nm from Nd: YVO4/KTP solid-state laser of maximum optical power 3 W. To avoid various noise coupled from the seed beam, the OPO is seeded by vacuum fluctuations instead of coherent field at the fundamental wavelength (1064 nm). A Pound-Drever-Hall (PDH) locking scheme is used to lock the OPO cavity length with the signal derived from the reflected pump beam, so as to lock the pump field and also lock the fundamental field. To make both the pump and seed beams resonant simultaneously, the temperature of the PPKTP is carefully adjusted. The squeezed state can be detected on a homodyne detection by interfering it with the local oscillator (LO) and detected by a balanced detector with two photodiodes (EXT500 T) but having the same quantum efficiency of 86% at 1064 nm. The subsequent electronic noise is analyzed with a low-frequency spectrum analyzer, which shows that the audio noise sources from lab enviroment, locking quality, escape efficiency, propagation loss, homodyne efficiency and detection efficiency have effect on the squeezing pruced by an OPO.
      通信作者: 翟泽辉, zhzehui@sxu.edu.cn
    • 基金项目: 国家自然科学基金(批准号: 11174189)和国家高技术研究发展计划(批准号: 2013AA8112008)资助的课题.
      Corresponding author: Zhai Ze-Hui, zhzehui@sxu.edu.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11174189), and the National High Technology Research and Development Program of China (Grant No. 2013AA8112008).
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    McKenzie K, Mikhailov E E, Goda K, Lam P K, Grosse N, Gray M B, Mavalvala N, McClelland D E 2005 J. Opt. Soc. Am. B 16 1705

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    Vahlbruch H, Chelkowski S, Hage B, Franzen A, Danzmann K, Schnabel R 2006 Phys. Rev. Lett. 97 011101

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    Walls D F, Milburn G J 1994 Quantum Optics (Berlin: Springer Verlag) pp141-142

  • [1]

    Kawamura S 2010 Class. Quantum Grav. 27 084001

    [2]

    Harry G M 2010 Class. Quantum Grav. 27 084006

    [3]

    Caves C M 1981 Phys. Rev. D 23 1693

    [4]

    Tobias E, Steinlechner S, Bauchrowitz J, et al. 2010 Phys. Rev. Lett. 104 251102

    [5]

    Sun H X, Liu K, Zhang J X, Gao J R 2015 Acta. Phys. Sin. 64 234210 (in chinese) [孙恒信, 刘奎, 张俊香, 郜江瑞 2015 物理学报 64 234210]

    [6]

    McKenzie K, Grosser N, Bowen W P, Whitcomb S E, Gray M B, McClelland D E, Lam P K 2004 Phys. Rev. Lett. 93 161105

    [7]

    McKenzie K, Gray M B, GoBler S, Lam P K, McClelland D E 2006 Class. Quantum Grav. 23 245

    [8]

    McKenzie K, Shaddock D A, McClelland D E 2002 Phys. Rev. Lett. 88 231102

    [9]

    Vahlbruch H, Chelkowski S, Hage B, Franzen A, Danzmann K, Schhnabel R 2005 Phys. Rev. Lett. 95 211102

    [10]

    Goda K, Miyakawa O, Mikhailov E E, Saraf S, Adhikari R, McKenzie K, Ward R, Vass S, Weinstein A J, Mavalvala N 2008 Nat. Phys. 4 472

    [11]

    The LIGO Scientific Collaboration 2011 Nat. Phys. 7 962

    [12]

    Taylor, Michael A, et al 2013 Nature Photon. 7 229

    [13]

    Travis H, Singh R, Dowling J P, Mikhailov E E 2012 Phys. Rev. A 86 023803

    [14]

    McKenzie K, Mikhailov E E, Goda K, Lam P K, Grosse N, Gray M B, Mavalvala N, McClelland D E 2005 J. Opt. Soc. Am. B 16 1705

    [15]

    Vahlbruch H, Chelkowski S, Hage B, Franzen A, Danzmann K, Schnabel R 2006 Phys. Rev. Lett. 97 011101

    [16]

    Walls D F, Milburn G J 1994 Quantum Optics (Berlin: Springer Verlag) pp141-142

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  • 文章访问数:  5957
  • PDF下载量:  249
  • 被引次数: 0
出版历程
  • 收稿日期:  2015-11-04
  • 修回日期:  2015-12-28
  • 刊出日期:  2016-03-05

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