摘要
通过选定低噪声电压基准芯片作为光电二极管的稳定偏压,采用低暗电流光电二极管,设计外围跨阻放大电路,利用低温漂系数元件,温控及电磁屏蔽等,研发低噪声光电探测器,并通过低频段强度噪声评估系统对其噪声进行测试评估。实验结果表明:所研发的低噪声探测器在空间引力波频段的电子学噪声谱密度在1.649×10^(-5)V/Hz^(1/2)以下,在0.1 mHz处为1.649×10^(-5)V/Hz^(1/2),在1 mHz处为6.95×10^(-6)V/Hz^(1/2),在1 Hz处为7.07×10^(-8)V/Hz^(1/2);在8 mW激光入射光电二极管时,探测器抬高为40 dB。该探测器噪声性能均小于相应引力波探测中对激光强度噪声的要求,可为引力波探测中激光强度噪声抑制等方面提供关键器件支撑。
The high sensitivity of gravitational wave detection provides a new way to explore the universe.Gravitational wave detection is a field of modern physics that has gained significant importance.The primary focus of space gravitational wave detection is to capture gravitational wave signals in the frequency range of 0.1 mHz to 1 Hz,which are mainly released by double compact star systems and astronomical events such as the merger of double black hole celestial bodies with a maximum mass ratio.This detection method complements ground-based gravitational wave and primary gravitational wave detection techniques.Space gravitational wave detection primarily relies on the establishment of a high-precision space inertial reference load ultra-stable platform across multiple satellites and high-precision inter-satellite laser interferometry technology as its core,including the tow-free control technology,ultra-high-precision inter-satellite laser interferometry technology,ultra-high sensitivity inertial sensing technology,precision formation technology,micro-new micro-push technology,and more.The laser source noise of spaceborne laser systems directly affects the sensitivity of ultra-high precision inter-satellite laser interferometry technology.Therefore,it is necessary to suppress laser intensity noise.Low noise laser source is essential to build a large-scale laser interferometer device for both space and ground-based gravitational wave detection.With suppressing the noise of the laser source by photoelectric feedback,the sensitivity of the gravitational wave detection device is improved.In the photoelectric feedback loop,the signal detected by the photodetector is first subtracted from the signal of voltage reference source,after passing through the proportional integral differentiator,it is then fed back to the pump photocurrent to suppress the noise of the laser source.During the feedback process,the photoelectric detection is the first stage to acquire the signal,the noise level of the photodetector will directly affect the performance of subsequent feedback loop.To improve the accuracy of the detection and level of the noise suppressing,the electronic noise of the photodetector must be restrained while the detection range must be expanded.To deal with the problems mentioned above,the photodetector with low noise is finally designed by choosing low noise voltage reference chip,low dark current photodiode,using low temperature drift factor element,designing transimpedance amplifiers circuit together with precise temperature controlling and electromagnetic shielding.Photodiodes need to be loaded with appropriate reverse bias for photoelectric conversion.The voltage stability of the reverse bias will directly affect the stability of photoelectric conversion in the photodiode,thus affecting the electronic noise of the photoelectric detection system.At the same time,the electronic noise of the photodetector is measured using a low noise power supply without a light source,and the electronic noise of the detector is tested using a high-precision multimeter.The performance of the designed photodetector is evaluated with the low frequency intensity noise evaluation system.The results show that the electronic noise spectral density of the detector is less than 1.649×10^(-5) V/Hz^(1/2),1.649×10^(-5) V/Hz^(1/2) at 0.1 mHz,6.95×10^(-6) V/Hz^(1/2) at 1 mHz,7.07×10^(-8) V/Hz^(1/2) at 1 Hz at the frequency of the space gravitational wave band.The gain of the photodetector is 40 dB with 8 mW laser injecting into the photodiode.The performance of the designed photodetector satisfies the requirement of laser noise suppressing for gravitational wave detection.In order to characterize the relative intensity noise of a laser light source and address the need for noise suppression in space gravitational wave detection,a system is developed to evaluate laser intensity noise for this purpose.This system includes a key device in the feedback loop for suppressing relative intensity noise within the frequency band of space gravitational wave detection:a low noise photodetector.Such photodetector plays a crucial role in the devices of laser noise suppressing for gravitational wave detection.
作者
郑立昂
李番
王嘉伟
李健博
高丽
贺子洋
尚鑫
尹王保
田龙
杨文海
郑耀辉
ZHENG Liang;LI Fan;WANG Jiawei;LI Jianbo;GAO Li;HE Ziyang;SHANG Xin;YIN Wangbao;TIAN Long;YANG Wenhai;ZHENG Yaohui(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-electronics,Shanxi University,Taiyuan 030006,China;State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China;China Academy of Space Technology(Xi'an),Xi'an 710000,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2023年第5期272-281,共10页
Acta Photonica Sinica
基金
国家重点研发计划(No.2020YFC2200402)
国家自然科学基金(Nos.62027821,62225504,62035015,U22A6003,12174234,12274275,62001374)
山西省重点研发计划(No.202102150101003)
山西省三晋学者特聘教授项目。
关键词
激光放大器
空间引力波探测
光电探测
电压噪声表征
对数轴谱密度算法
Laser amplifier
Space-based gravitational wave detection
Photoelectric detection
Voltage noise characterization
Logarithmic spectral density algorithm
