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面向空间引力波探测的毫赫兹频段低强度噪声单频激光器

王在渊 王洁浩 李宇航 柳强

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面向空间引力波探测的毫赫兹频段低强度噪声单频激光器

王在渊, 王洁浩, 李宇航, 柳强

Millihertz band low-intensity-noise single-frequency laser for space gravitational wave detection

Wang Zai-Yuan, Wang Jie-Hao, Li Yu-Hang, Liu Qiang
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  • 低噪声单频激光器是空间引力波探测系统中的核心器件, 其噪声性能直接影响空间引力波探测器的灵敏度. 本文报道了一种面向空间引力波探测的低噪声单频激光器, 利用全保偏光纤结构的功率放大器对低功率、窄线宽、低噪声的非平面环形振荡器输出激光进行放大. 为降低激光的强度噪声, 比较了不同泵浦源的输出特性, 为光纤放大器选用波长锁定的泵浦源, 降低泵浦光波长随温度漂移对输出功率的影响, 利用光电负反馈控制技术抑制输出激光的强度噪声, 结合主动精确控温技术抑制关键器件的热噪声, 实现了毫赫兹频段强度噪声的抑制. 利用自主搭建的4通道相对强度噪声测量系统, 测得反馈控制后的激光器相对强度噪声在1 mHz—1 Hz频段内低于–60 dBc/Hz, 在1 mHz和1 Hz处分别为–63.4 dBc/Hz和–105.8 dBc/Hz. 研究结果表明, 通过放大器泵浦电流的反馈控制和关键器件的温度控制可以有效地抑制激光器在毫赫兹频段的强度噪声, 为进一步提高低频段强度噪声性能奠定基础.
    A low-noise single-frequency laser is a key component of the space-based gravitational wave detector, and the intensity noise of the laser directly affects the sensitivity of the space-based GW detector. In this work, we report a low-noise single-frequency laser designed for space-based gravitational wave detector. The laser is based on a master oscillator power amplifier (MOPA), which is designed to possess a low-power, narrow-linewidth seed laser acting as master oscillator (MO) and an all polarization-maintaining fiber amplifier acting as power amplifier (PA). The amplifier that uses a robust mechanical design consists of an Yb-doped double-clad fiber forward pumped by wavelength-locked 976 nm pump laser diode (LD) to achieve 2.13 W of output power and 70 dB of signal-noise ratio (SNR). To suppress the relative intensity noise (RIN) in a millhertz regime (1 mHz–1 Hz), we characterize the power stabilization of a pump diode laser based on a proportional-integral-derivative (PID) feedback control loop where an in-loop photodetector is used. The power fluctuation can be converted into the fluctuation of the current signal by the photodiode, the current signal is converted into the voltage signal and amplified by a transimpedance circuit. Then, the voltage signal is compared with the voltage reference signal, and the error signal is achieved to adjust real-timely the drive current of the pump laser diode. This is a good way to significantly suppress the RIN of a laser at low frequencies, but the measured RIN below 4 mHz is still higher than –60 dBc/Hz. In order to further suppress the RIN to lower than 4 mHz, an active precise temperature control technology is used to suppress the thermal noise from pump LD and fiber coupler. To assess the RIN milliertz regime, we design an RIN measurement system consisting of a high-precision signal acquisition card (24 bit) and a computer program based on LabVIEW. The measurement range of the system is 2 μHz–102.4 kHz and the frequency resolution up to 2 µHz, much better than the counterparts of commercial instruments. By stabilizing the fiber amplifier pump LD current and the temperature of pump LD and the temperature of fiber coupler, the out-of-loop RINs are measured to be –63.4 dBc/Hz@1 mHz and –105.8 dBc/Hz@1 Hz , and in a milliertz regime of 1 mHz–1 Hz, the RIN is below –60 dBc/Hz. The results show that the feedback control of the fiber amplifier pump LD current and the temperature control of the key devices can effectively suppress the RIN in the millihertz frequency band, which lays a foundation for further improving the intensity noise performance in the low frequency band.
      通信作者: 李宇航, liyuhang@tsinghua.edu.cn ; 柳强, qiangliu@tsinghua.edu.cn
    • 基金项目: 国家重点研发计划(批准号: 2020YFC2200403)资助的课题.
      Corresponding author: Li Yu-Hang, liyuhang@tsinghua.edu.cn ; Liu Qiang, qiangliu@tsinghua.edu.cn
    • Funds: Project supported by the National Key R&D Program of China (Grant No. 2020YFC2200403).
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    罗子人, 白姗, 边星, 陈葛瑞, 董鹏, 董玉辉, 高伟, 龚雪飞, 贺建武, 李洪银, 李向前, 李玉琼, 刘河山, 邵明学, 宋同消, 孙保三, 唐文林, 徐鹏, 徐生年, 杨然, 靳刚 2013 力学进展 43 415Google Scholar

    Luo Z R, Bai S, Bian X, Chen G R, Dong P, Dong Y H, Gao W, Gong X F, He J W, Li H Y, Li X Q, Li Y Q, Liu H S, Shao M X, Song T X, Sun B S, Tang W L, Xu P, Xu S N, Yang R, Jin G 2013 Adv. Mech. 43 415Google Scholar

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    O’Brien S, Welch D, Parke R, Mehuys D, Dzurko K, Lang R, Waarts R, Scifres D 1993 IEEE J. Quantum Electron. 29 2052Google Scholar

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    李灿 2015 博士学位论文 (广州: 华南理工大学)

    Li C 2015 Ph. D. Dissertation (Guangzhou: South China University of Technology) (in Chinese)

    [8]

    Tröbs M 2005 Ph. D. Dissertation (Hannover: Leibniz University Hannover)

    [9]

    Nicklaus K, Herding M, Wang X, Beller N, Fitzau O, Giesberts M, Herper M, Barwood G P, Williams R A, Gill P, Koegel H, Webster A, Gohlke M 2014 Proceedings of the International Conference on Space Optics 10563 105632TGoogle Scholar

    [10]

    Dahl K, Cebeci P, Fitzau O, Giesberts M, Greve C, Krutzik M, Peters A, Pyka S, Sanjuan J, Schiemangk M, Schuldt T, Voss K, Wicht A 2018 Proc. SPIE 11180 111800CGoogle Scholar

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    Gong Y G, Jun Luo, Wang B 2021 Nat. Astron. 5 881Google Scholar

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    Luo Z R, Guo Z K, Jin G, Wu Y L, Hu W R 2020 Results Phys. 16 102918Google Scholar

    [14]

    Luo Z R, Wang Y, Wu Y L, Hu W R, Jin G 2021 Prog. Theor. Exp. Phys. 2021 05A108Google Scholar

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    Foster S B, Tikhomirov A E. 2010 IEEE J. Quantum Electron. 46 734Google Scholar

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    Guiraud G, Traynor N, Santarelli G 2016 Opt. Lett. 41 4040Google Scholar

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    杨中民, 徐善辉 2017 单频光纤激光器(北京: 科学出版社) 第59页

    Yang Z M, Xu S H 2017 Single-frequency Fiber Laser (Beijing: Science Press) p59 (in Chinese)

    [18]

    Hui R Q, O’Sullivan M 2009 Fiber Optic Test & Measurement (California: Elsevier Academic Press) pp263–264

    [19]

    李番, 王嘉伟, 高子超, 李健博, 安炳南, 李瑞鑫, 白禹, 尹王保, 田龙, 郑耀辉 2022 物理学报 17 209501Google Scholar

    Li F, Wang J W, Gao Z C, Li J B, An B N, Li R X, Bai Y, Yin W B, Tian L, Zheng Y H 2022 Acta Phys. Sin. 17 209501Google Scholar

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    Willke B 2010 Laser Photonics Rev. 4 780Google Scholar

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    Tröbs M, Heinzel G 2006 Measurement 39 120Google Scholar

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    Möller L 1998 IEEE J. Quantum Electron. 34 1554Google Scholar

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    Xue M Y, Gao C X, Niu L Q, Zhu A L, Sun C D 2020 Appl. Opt. 59 2610Google Scholar

  • 图 1  低噪声单频激光器的结构示意图

    Fig. 1.  Schematic of the low-noise single-frequency laser system.

    图 2  不同温度下泵浦LD的光谱 (a) 不锁波长LD的光谱; (b) 锁波长LD的光谱

    Fig. 2.  Optical spectra of 976 nm pump laser diodes at different temperature: (a) Wavelength-unlocked; (b) wavelength-locked.

    图 3  RIN测量示意图

    Fig. 3.  Experimental setup of RIN measurement.

    图 4  0.1 mHz—10 Hz频段内的RIN测量结果

    Fig. 4.  Measured RIN in the frequency of 0.1 mHz–10 Hz.

    图 5  放大器内部的红外热像图

    Fig. 5.  Infrared thermal image inside the fiber amplifier.

    图 6  不同温度下的外环RIN测量结果

    Fig. 6.  RIN measurement results of the out-of-loop at the different temperatures.

    图 7  2.13 W 输出时的功率稳定性 (a)、放大前后的光谱(b)和放大器的附加线宽(c)

    Fig. 7.  Power stability (a), optical spectra (b) and additional linewidth (c) at 2.13 W output, respectively.

  • [1]

    Numata K, Yu A, Jiao H, Merritt S, Micalizzi F, Fahey M, Camp J, Krainak M 2019 Proceedings of SPIE: Solid State Lasers XXIII: Technology and Devices 10896 108961HGoogle Scholar

    [2]

    罗子人, 白姗, 边星, 陈葛瑞, 董鹏, 董玉辉, 高伟, 龚雪飞, 贺建武, 李洪银, 李向前, 李玉琼, 刘河山, 邵明学, 宋同消, 孙保三, 唐文林, 徐鹏, 徐生年, 杨然, 靳刚 2013 力学进展 43 415Google Scholar

    Luo Z R, Bai S, Bian X, Chen G R, Dong P, Dong Y H, Gao W, Gong X F, He J W, Li H Y, Li X Q, Li Y Q, Liu H S, Shao M X, Song T X, Sun B S, Tang W L, Xu P, Xu S N, Yang R, Jin G 2013 Adv. Mech. 43 415Google Scholar

    [3]

    Peterseim M, Brozek O S, Danzmann K, Freitag I, Rottengatter P, Tünnermann A, Welling H 1998 AIP Conf. Proc. 456 148Google Scholar

    [4]

    O’Brien S, Welch D, Parke R, Mehuys D, Dzurko K, Lang R, Waarts R, Scifres D 1993 IEEE J. Quantum Electron. 29 2052Google Scholar

    [5]

    Yang C S, Xu S H, Chen D, Zhang Y F, Zhao Q L, Li C, Zhou K J, Feng Z M, Gan J L, Yang Z M 2016 J. Opt. 18 055801Google Scholar

    [6]

    Kane T 1990 IEEE Photonics Technol. Lett. 2 244Google Scholar

    [7]

    李灿 2015 博士学位论文 (广州: 华南理工大学)

    Li C 2015 Ph. D. Dissertation (Guangzhou: South China University of Technology) (in Chinese)

    [8]

    Tröbs M 2005 Ph. D. Dissertation (Hannover: Leibniz University Hannover)

    [9]

    Nicklaus K, Herding M, Wang X, Beller N, Fitzau O, Giesberts M, Herper M, Barwood G P, Williams R A, Gill P, Koegel H, Webster A, Gohlke M 2014 Proceedings of the International Conference on Space Optics 10563 105632TGoogle Scholar

    [10]

    Dahl K, Cebeci P, Fitzau O, Giesberts M, Greve C, Krutzik M, Peters A, Pyka S, Sanjuan J, Schiemangk M, Schuldt T, Voss K, Wicht A 2018 Proc. SPIE 11180 111800CGoogle Scholar

    [11]

    Milyukov V 2020 Astron. Rep. 64 1067Google Scholar

    [12]

    Gong Y G, Jun Luo, Wang B 2021 Nat. Astron. 5 881Google Scholar

    [13]

    Luo Z R, Guo Z K, Jin G, Wu Y L, Hu W R 2020 Results Phys. 16 102918Google Scholar

    [14]

    Luo Z R, Wang Y, Wu Y L, Hu W R, Jin G 2021 Prog. Theor. Exp. Phys. 2021 05A108Google Scholar

    [15]

    Foster S B, Tikhomirov A E. 2010 IEEE J. Quantum Electron. 46 734Google Scholar

    [16]

    Guiraud G, Traynor N, Santarelli G 2016 Opt. Lett. 41 4040Google Scholar

    [17]

    杨中民, 徐善辉 2017 单频光纤激光器(北京: 科学出版社) 第59页

    Yang Z M, Xu S H 2017 Single-frequency Fiber Laser (Beijing: Science Press) p59 (in Chinese)

    [18]

    Hui R Q, O’Sullivan M 2009 Fiber Optic Test & Measurement (California: Elsevier Academic Press) pp263–264

    [19]

    李番, 王嘉伟, 高子超, 李健博, 安炳南, 李瑞鑫, 白禹, 尹王保, 田龙, 郑耀辉 2022 物理学报 17 209501Google Scholar

    Li F, Wang J W, Gao Z C, Li J B, An B N, Li R X, Bai Y, Yin W B, Tian L, Zheng Y H 2022 Acta Phys. Sin. 17 209501Google Scholar

    [20]

    Willke B 2010 Laser Photonics Rev. 4 780Google Scholar

    [21]

    Tröbs M, Heinzel G 2006 Measurement 39 120Google Scholar

    [22]

    Möller L 1998 IEEE J. Quantum Electron. 34 1554Google Scholar

    [23]

    Xue M Y, Gao C X, Niu L Q, Zhu A L, Sun C D 2020 Appl. Opt. 59 2610Google Scholar

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出版历程
  • 收稿日期:  2022-11-07
  • 修回日期:  2022-12-07
  • 上网日期:  2022-12-26
  • 刊出日期:  2023-03-05

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