Note: Current induced fluctuations in the orientation of the beam diffracted by a liquid crystal spatial light modulator

Konwar, Santanu; Boruah, Bosanta R.

doi:10.1063/1.4985636

Cited by 5 publications

(1 citation statement)

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“…LCSLM has become one of the hottest topics in the field of adaptive optics, free space optical, beam deflection and beam phased array in recent years. Because of the electrically controlled birefringence, LCSLM can modulate light amplitude or phase by generating different path patterns, without moving parts [1][2][3]. Furthermore, driven by an electric field, low power consumption and micro-radius level resolution [4][5][6], making LCSLM an ideal device of spatial line of sight correction.…”

Section: Introductionmentioning

confidence: 99%

Line of Sight Correction of High-Speed Liquid Crystal Using Overdriving Technology

Guo

et al. 2020

Electronics

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In the line of sight correction system, the response time of the liquid crystal spatial light modulator under the normal driving voltage is too long to affect system performance. On the issues, an overdriving method based on a Field-Programmable Gate Array (FPGA) is established. The principle of the overdrive is to use a higher voltage difference to achieve a faster response speed of liquid crystal. In this scheme, the overdriving look-up table is used to seek the response time of the quantized phase, and the liquid crystal electrode is driven by Pulse–Width Modulation (PWM). All the processes are performed in FPGA, which releases the central processing unit (CPU) memory and responds faster. Adequate simulations and experiments are introduced to demonstrate the proposed method. The overdriving experiment shows that the rising response time is reduced from 530 ms to 34 ms, and the falling time is from 360 ms to 38 ms under the overdriving voltage. Typical light tracks are imitated to evaluate the performance of the line of sight correction platform. Results show that using the overdrive the −3 dB rejection frequency was increased from 1.1 Hz to 2.6 Hz. The suppression ability of the overdrive is about −20 dB at 0.1 Hz, however the normal-driving suppression ability is only about −13 dB.

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