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Liquid Crystal Variable Retarder
Liquid Crystal Variable Retarder
Category : Liquid Crystal Devices

To prevent ionic buildup, which can damage the liquid crystal layer, liquid crystal devices should be electrically driven with an AC waveform with little to no DC component. We require a 2 kHz square wave of adjustable amplitude for controlling our Liquid Crystal Variable Retarders (LCVRs). …

High Speed Liquid Crystal Variable Retarder
High Speed Liquid Crystal Variable Retarder
Category : Liquid Crystal Devices

LCVR uses nematic liquid crystal materials to electrically control polarization and provide tunable retardation by changing the effective birefringence of the material with applied voltage, thus altering the input polarized light to any chosen elliptical, linear or circular polarization.   Our precision HS LCVR requires unique fabrication and assembly steps.  We construct these retarders using optically flat fused silica windows coated with our transparent conductive Indium Tin Oxide (ITO).  Our ITO coating …

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Twisted Nematic Liquid Crystal Devices

Twisted Nematic Liquid Crystal Devices Meadowlark Optics first introduced nematic liquid crystal (LC) devices for precision optical applications more than 25 years ago. These devices are variable retarders, sometimes called LCVRs. They provide electrical control of retardance at low voltages, usually 20 volts (2 kHz square wave AC) or less. Figure 1 shows an example of the relationship of retardation to voltage for one of these devices. In many applications they have supplanted their much higher voltage cousin, the Pockels cell.