Quasi-monolithic heterodyne laser interferometer for inertial sensing

Investigation and mitigation of noise contributions in a compact heterodyne interferometer

We present a noise estimation and subtraction algorithm capable of increasing the sensitivity of heterodyne laser interferometers by one order of magnitude. The heterodyne interferometer is specially designed for dynamic measurements of a test mass in the application of sub-Hz inertial sensing. A noise floor of 3.31E-11 m/rtHz at 100mHz is achieved after applying our noise subtraction algorithm to a benchtop prototype interferometer that showed a noise level of 2.76E-10 m/rtHz at 100mHz when tested in vacuum at levels of 3E-5 Torr. Based on the previous results, we investigated noise estimatio…

Fiber-based two-wavelength heterodyne laser interferometer

Displacement measuring interferometry is a crucial component in metrology applications. In this paper, we propose a fiber-based two-wavelength heterodyne interferometer as a compact and highly sensitive displacement sensor that can be used in inertial sensing applications. In the proposed design, two individual heterodyne interferometers are constructed using two different wavelengths, 1064 nm and 1055 nm; one of which measures the target displacement and the other monitors the common-mode noise in the fiber system. A narrow-bandwidth spectral filter separates the beam paths of the two interfe…

基于紫外胶粘接的准整体式紧凑干涉仪构建方法

A construction method of the quasi-monolithic compact interferometer based on UV-adhesives bonding

本文提出一种基于紫外胶粘接的准整体式紧凑干涉仪构建方法，通过构建马赫-曾德尔和外差干涉仪，实现了皮米级位移和纳弧度级倾斜的高灵敏度测量。

Optomechanical Inertial Sensors

We present a performance analysis of compact monolithic optomechanical inertial sensors that describes their key fundamental limits and overall acceleration noise floor. Performance simulations for low frequency gravity-sensitive inertial sensors show attainable acceleration noise floors of the order of 10^-11 ms^-2/rtHz. Furthermore, from our performance models, we determine the optimization criteria in our sensor designs, sensitivity, and bandwidth trade space. We conducted characterization measurements of these compact mechanical resonators, demonstrating mQ-products at levels of 250kg, whi…

用于惯性传感的光机械激光器

Optomechanical lasers for inertial sensing

本研究结合VECSEL与单片熔融石英谐振器研发出惯性敏感光机械激光器，搭建原型并通过外差干涉仪验证，证实其用于惯性传感的可行性。

用于精密惯性传感的单元件双干涉仪：亚皮米结构稳定性及其作为激光频率稳定参考的性能

Single-Element Dual-Interferometer for Precision Inertial Sensing: Sub-picometer Structural Stability and Performance as a Reference for Laser Frequency Stabilization

本文提出一种基于单片五棱镜的紧凑型马赫-曾德尔干涉仪，通过平衡探测与反馈实现优于6×10⁻¹³的激光频率稳定度和亚皮米级光程稳定性，可用于精密惯性传感和激光频率稳定参考。