Single beam interferometric angle measurement

Noncontact measurement method of linear and angular displacement based on dual-beam feedback interferometric system

This study describes a unique optical approach for the noncontact measurement of linear and angular displacement. Compared to previous methods, the sensor system here based on the dual-beam phase-modulated feedback interferometry provides higher sensitivity for non-cooperative targets and a wider range concerning the angle measurement. The amount of linear and angular displacement is calculated by tracing the phase changes of the differential beams. Performance of the proposed method is evaluated via testing a prototype system. The prototype has a 35 nm and 0.15" stability over 1 hour, with a …

利用同步辐射实现完整横向束流表征的新型干涉孔径掩模技术

New interferometric aperture masking technique for full transverse beam characterization using synchrotron radiation

针对可见光干涉法需多次旋转测量才能重建束流的问题，本文提出受天文方法启发的多孔径掩模干涉技术，可单次采集完成二维横向束流重建，并在ALBA光源验证。

具有激光自动对准功能的准单片紧凑型干涉传感头设计

Quasi-monolithic Compact Interferometric Sensor Head Design with Laser Auto-alignment

本文提出一种具备自动对准功能的紧凑型干涉传感头设计，通过角反射器二次反射实现测量光束与参考光束的自动对准，无需调整激光束对准即可在任意运动中保持高干涉对比度，并在1Hz处实现1 pm/Hz^1/2的位移灵敏度。

Analytical description of interference between two misaligned and mismatched complete Gaussian beams

A typical application for laser interferometers is a precision measurement of length changes that result in interferometric phase shifts. Such phase changes are typically predicted numerically, due to the com- plexity of the overlap integral that needs to be solved. In this paper we will derive analytical representations of the interferometric phase and contrast (aka. fringe visibility) for two beam interferometers, both homodyne and heterodyne. The fundamental Gaussian beams can be arbitrarily misaligned and mismatched to each other. A limitation of the analytical result is that both beams mu…

Measurement of focusing properties for high numerical aperture optics using an automated submicron beamprofiler

The focusing properties of three aspheric lenses with numerical aperture (NA) between 0.53 and 0.68 were directly measured using an interferometrically referenced scanning knife-edge beam profiler with sub-micron resolution. The results obtained for two of the three lenses tested were in agreement with paraxial gaussian beam theory. It was also found that the highest NA aspheric lens which was designed for 830nm was not diffraction limited at 633nm. This process was automated using motorized translation stages and provides a direct method for testing the design specifications of high numerical…

Design and construction of an optical test bed for LISA imaging systems and tilt-to-length coupling

The Laser Interferometer Space Antenna (LISA) is a future space-based interferometric gravitational-wave detector consisting of three spacecraft in a triangular configuration. The interferometric measurements of path length changes between satellites will be performed on optical benches in the satellites. Angular misalignments of the interfering beams couple into the length measurement and represent a significant noise source. Imaging systems will be used to reduce this tilt-to-length coupling. We designed and constructed an optical test bed to experimentally investigate tilt-to-length couplin…