Abstract
The influence of driving conditions on the phase-modulation ability of an optically addressable spatial-light modulator (OASLM) is investigated using an equivalent circuit method and a system for measuring wave-front modulation that uses a phase-unwrapping data-processing method, and is constructed with a charge-coupled device and wave-front sensor. 1λ peak-to-valley phase change for a 1053 nm laser beam is acquired with the home-made OASLM at the optimal driving voltage of 14 V at 200 Hz. The detection system for wave-front modulation has a spatial resolution of 200 µm for binary images and a minimum distinguishable contrast of 1 mm. On-line phase modulation with feedback control can be acquired with the OASLM and the corresponding measuring system.
Highlights
Liquid crystals (LCs) [1], as tunable elements, are increasingly being used for non-display applications, including intelligent windows, tunable phase-retarders, terahertz bandgap fibers, and spatial-light modulators [2,3,4,5]
The voltage across the LC layer affects the phase-modulation ability, which can be controlled by changing the write-light irradiance in the form of a grayscale image loaded on the liquid crystal on silicon (LCOS) in a practical application; we have experimentally verified the phase-modulation ability of the optically addressable spatial-light modulator (OASLM) as a function of gray-level values when the light-emitting diode (LED) is at different drive currents
We applied an equivalent circuit of the OALCLV to study the influence of driving conditions, including the frequency of drive voltage and irradiance of write light on the voltage of the LC layer; at the same time, we investigated the influence of driving conditions on the modulation ability of the phase-only OASLM
Summary
Liquid crystals (LCs) [1], as tunable elements, are increasingly being used for non-display applications, including intelligent windows, tunable phase-retarders, terahertz bandgap fibers, and spatial-light modulators [2,3,4,5]. Vat 200 Hz. In order to monitor the phase-control ability of the OASLM, a detection system including a charge-coupled device (CCD) and WFS was constructed and the aforementioned unwrapping. The modulation result of a binary image with variable frequencies, and the modulation transfer function (MTF), indicate that the system has a spatial resolution of 200 μm for continuous modulation measurement (LCVRs). This method can quickly and accurately obtain the original, function of and athe minimum distinguishable contrast of 1 mm.discontinuities. The impact of driving conditions, including the frequency of the applied voltage and the write-light on the modulation of phase-only is investigated
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