Beam Pointing Precision Control by Using a Liquid Crystal Optical Phased Array

Li Ying Wu; Jian Zhang; Yun Fang

doi:10.4028/www.scientific.net/KEM.437.344

Paper Titles

Differential Reflectometry of Fiber Bragg Gratings
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Alignment of Cassegrain Telescope with Epps-Shulte Focus
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Intelligent Assessment for Pathological Gait Analysis
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Fuzzy Clustering Algorithm of Early Fire Based on Process Characteristic
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Beam Pointing Precision Control by Using a Liquid Crystal Optical Phased Array
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Detection of Indoor Formaldehyde Concentration Using LaSrFeO₃-Doped SnO₂ Gas Sensor
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Polymer Based Micro Sensors Arrays for Ph and Glucose Monitoring
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Fiber Bragg Grating Demodulation System Based on Equi-Intensity Cantilever Beam
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Auto Focusing Confocal Laser Induced Fluorescence Detection System
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 437Beam Pointing Precision Control by Using a Liquid...

Beam Pointing Precision Control by Using a Liquid Crystal Optical Phased Array

Abstract:

For laser beam steering, a pure optical-electric system without mechanical or inertial parts is used. The new device is a Liquid Crystal Optical Phased Array (LCOPA). Supplying electric field to liquid crystal cell with electrodes, the extraordinary refractive index changes, which results in phase shift that modulates the direction of incident beam. The advantages of this device are small size, less energy consuming, programmable and addressable control. A one dimensional device is designed and tested. The resolution of the steering angle is 20 μrad, the range is ±2o. The effect of flyback region and phase valley on diffraction efficiency is also discussed briefly.