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摘要: 在“太极计划”中，由卫星抖动引起的激光抖动噪声是影响激光干涉测量精度的主要噪声源之一，为保证测量精度，需抑制该噪声至10 nrad/
${\sqrt{{\rm{Hz}}}}$ @10 mHz。首先，采用由四象限光电探测器和相位计组成的角度敏感器进行角度信号测量，并利用马赫-曾德干涉仪结合比例-积分-微分控制技术，搭建了地基激光抖动噪声抑制系统。其次，分析了系统反馈控制能力以及系统对于抑制激光抖动噪声的有效性。实验结果表明：该系统可有效抑制激光抖动噪声，使得激光抖动噪声小于4 nrad/${\sqrt{{\rm{Hz}}}}$ @10 mHz。实验推进了“太极计划”对激光抖动噪声抑制水平的研究，为激光干涉测量奠定了物理实验基础。Abstract: In the “Taiji mission”, the laser jitter noise caused by satellite jitter is one of the main noise sources that affect the accuracy of laser interferometer. In order to ensure the measurement accuracy, the noise must be suppressed to 10 nrad/$\sqrt{{\rm{Hz}}} $ @10 mHz. Firstly, an angle sensor composed of a four-quadrant photodetector and a phase meter was used to measure the angle signal, and a Mach-Zehnder interferometer combined with proportional-integral-derivative control technology was used to build a ground-based laser jitter noise suppression system. Secondly, the feedback control capability of the system and the effectiveness of the system to suppress laser jitter noise were analyzed. The experimental results showed that the system could effectively suppress the laser jitter noise, and the laser jitter noise was <4 nrad/$\sqrt{{\rm{Hz}}} $ @10 mHz. The experiment advanced the study of the “Taiji mission” on the level of laser jitter noise suppression, which laid a physical experimental foundation for laser interferometry.-
Key words:
- Taiji mission /
- laser interferometer in space /
- laser jitter noise
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图 1 差分波前敏感测角技术原理图
Figure 1. Schematic diagram of differential wavefront sensitive angle measurement technology
图 2 激光抖动噪声抑制系统。（a）激光调制光路；（b）干涉光路；（c）总体光路
Figure 2. Laser jitter noise suppression system. (a) Laser modulation optical path; (b) interference optical path; (c) overall optical path
图 3 串扰测试结果。（a）水平方向运动对垂直方向的串扰；（b）垂直方向运动对水平方向的串扰
Figure 3. Crosstalk test results. (a) Crosstalk of horizontal movement to vertical direction; (b) crosstalk of vertical movement to horizontal direction
图 4 相角转化因子实验结果。(a)垂直方向；(b)水平方向
Figure 4. Experimental results of phase-angle conversion factor. (a) Vertical direction; (b) Horizontal direction
图 5 系统读出噪声时域图。（a）垂直方向；（b）水平方向
Figure 5. Time domain diagram of system readout noise. (a) Vertical direction; (b) horizontal direction
图 6 系统读出噪声频域图。（a）垂直方向；（b）水平方向
Figure 6. Frequency domain diagram of system readout noise. (a) Vertical direction; (b) horizontal direction
图 7 激光抖动噪声抑制结果（分别加抖动）。（a）垂直方向；（b）水平方向
Figure 7. Laser jitter noise suppression results (with separate jitter). (a) Vertical direction; (b) horizontal direction
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