High Contrast Optical Shutter

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High Contrast Optical Shutter

KEY FEATURES
  • High contrast
  • No mechanical motion
  • Computer control capacity
  • No vibration

DESCRIPTION

Our liquid crystal shutter uses twisted nematic liquid crystals to provide a vibration-free mechanical shutter alternative. The twisted nematic liquid crystal switches between a state that rotates the input polarization by 90° with no voltage applied and a state that makes no change in the input polarization with 8 to 10 volts applied. The applied voltage is a 2 kHz AC square-wave. The shutter is supplied with integral dichroic visible polarizers to provide an average extinction ratio of better than 1,000:1. Custom shutters with larger aperture sizes and with wavelength coverage to 2.1 microns are available on a custom basis.

White Paper:   Twisted Nematic Liquid Crystal

Specifications - High Contrast Optical Shutters
Liquid Crystal Configuation Twisted nematic
Substrate Material Optical quality synthetic fused silica
Polarizer Material Dichroic polymer
Wavelength Range 450-1800 nm
Contrast Ratio (average) 1,000:1
Acceptance Angle 25˚ incidence angle with some reduction above 10˚
Switching Time (10% to 90% at room temperature)
Closed to open:
Open to closed:
5 milliseconds
0.4 milliseconds
Transmitted Wavefront Distortion ≤ λ/2
Surface Quality (scratch-dig) 60-40
Beam Deviation ≤ 5 arc min
Reflectance (per surface) ≤ 0.5% at normal incidence
Laser Damage Threshold 1 W/cm2, CW
Glass Thickness 0.48-0.52 in.
Polarization Direction Vertical on input face, horizontal on output face
Storage Temperature -20˚C to +80˚C
Operating Temperature 0˚C to +50˚C
 

 

Ordering Information - High Contrast Optical Shutters
Clear
Aperture
in. [mm]
Diameter
± 0.005 in.
[± 0.13 mm]
Thickness
in. [mm]
Part Number
0.37
[9.4]
Ø1.00
[Ø25.4]
1.23
[31.2]
LCS-100
0.70
[17.8]
Ø2.00
[Ø50.8]
0.75
[19.1]
LCS-200
1.60
[40.6]
Ø3.00
[Ø76.2]
1.00
[25.4]
LCS-300