Implementation of a speckle-correlation-based optical lever with extended dynamic range

Appl Opt. 2019 Aug 1;58(22):5982-5988. doi: 10.1364/AO.58.005982.

Abstract

A speckle-correlation-based optical lever (SC-OptLev) is constructed for the measurement of small changes in the orientation angle of a surface. The dynamic range of SC-OptLev is found to be twice that of a conventional OptLev for the same experimental configurations. Different filtering mechanisms are implemented, and the correlation results are compared. Two types of computer-automated SC-OptLevs, an open-source-based computing system with a low-cost image sensor and a commercial computing system, are presented with assistive computational modules.