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基于内腔光阱的光力加速度测量方法
刘子捷,熊威,邝腾芳,冯海宁,肖光宗,罗晖
0
(国防科学技术大学前沿交叉学科学院,长沙 410072)
摘要:
内腔光阱中被捕获微粒的微小位移将导致腔内激光功率的大幅变化,可实现光阱系统的快速自反馈。基于这一原理,提出了一种新型加速度测量方案。该方案计算了内腔光阱中被捕获微粒的径向受力,建立了利用激光功率进行加速度传感的理论模型,并分析了工作点的选取对加速度测量的影响。系统以高频光电探测器作为加速度测量模块,可实现GHz量级的信号采集。内腔光阱将进一步促进光镊技术在惯性测量方向上的应用。
关键词:  内腔光阱  加速度  精密测量
DOI:
基金项目:国防科技大学科研计划项目(ZK20-14)
Light Force Acceleration Measurement Method Based on Intracavity Optical Trap
LIU Zi-jie,XIONG Wei,KUANG Teng-fang,FENG Hai-ning,XIAO Guang-zong,LUO Hui
(National University of Defense Technology, Changsha 410072, China)
Abstract:
The small displacement of the trapped microsphere in intracavity optical trap causes a large variation of laser power in the intracavity optical trap, which implements a quick self-feedback. Based on this principle, a new acceleration measurement method is presented. The radial light force in the intracavity trap has been calculated. A theoretical model of acceleration sensing using laser power is established, and the influence of working point selection on acceleration measurement is analyzed. A high frequency photodetector is used as an acceleration measurement module to sample the GHz acceleration signal. Intracavity optical trap will promote the application of optical tweezers in inertial measurement.
Key words:  Intracavity optical trap  Acceleration  Precision measurement

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