Compact eye-safe photorefractive coherent receiver for vibration analysis

Summary form only given. Vibration analysis is a widely used technique in industry for the nondestructive inspection and metrology of mechanical structures. Nondestructive inspections such as optical methods present many advantages over conventional techniques. Eye-safe operation of the device is essential. Coherent detection can be a potential candidate to design a vibration analysis device. In this paper, we present the design and the performance of a compact eye-safe coherent receiver for vibration analysis. We will propose an analytical resolution of the coupled equations system that describes two wave mixing in photorefractive crystal as an adaptive beam combiner in a coherent detection, in presence of a phase modulation of the signal beam.