KEYWORDS: Liquid crystals, Beam steering, Control systems, Charge-coupled devices, Beam controllers, Control systems design, Phased array optics, Data modeling, Signal detection, Laser communications
The liquid crystal beam steering technology with low driving voltage, high diffraction efficiency and without the
effect of mechanical inertia,is regard as a potential technology in the field of non-mechanical beam steering. Liquid
crystal spatial light modulator (LCSLM) can be applied as a beam steering control device in laser communication, and it
can realize the programmable control in real time. And compared with fast steering mirror (FSM), which is widely used
at present, LCSLM is smaller, lighter and lower power consumptive in a non-mechanical way, so it’s convenient to
control. But the system bandwidth is a restricted problem in the research. In this article, the principle of beam steering
with LCSLM is introduced firstly. A beam steering bench is set up using reflective pure-phase LCSLM from BNS. The
offset of beam spot is detected by the CCD and a classic PI close-loop control experiment is designed to test the system
bandwidth. And then the factors which restricted the control bandwidth are analyzed. Considering the effect of the CCD’
frame rate, the PSD with higher frame rate is used in the control system and the data model of the liquid crystal is tested.
A controller is designed based on the data model and the bandwidth is improved observably.
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