Optical inspection of micro-electromechanical systems

摘要

We report the results of utilization of wide-gap photorefractive sillenite crystals as adaptive photodetectors (AP) for optical inspection of micro-electromechanical systems. The operation principle of AP is based on two-wave mixing and non-steady-state photoelectromotive force effects in photorefractive crystals. The results of measurements of small vibration amplitudes and resonant frequencies of the diffusely scattering objects and micro-electromechanical systems are given. The presented adaptive interferometric systems are suitable for industrial applications.