Liquid Crystal Variable Retarder

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Liquid Crystal Variable Retarder

KEY FEATURES
  • Computer control capability
  • Temperature control options
  • Usable from 450 to 1800 nm
  • Precision non-mechanical retardation control
DESCRIPTION
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). Our Basic Controller and Four Channel Interface ensure these drive requirements are met.
 
A temperature sensing and control option can be added to our LCVRs for accurate control of the operating temperature. A temperature sensor is attached directly to the LCVR substrate, outside its clear aperture and a heater is attached to the LCVR housing. This provides active heating and passive cooling of the liquid crystal device.

Specifications - Liquid Crystal Variable Retarder
Retarder Material Nematic liquid crystal
Substrate Material Optical quality synthetic fused silica
Wavelength Range 450-1800 nm (specify)
Retardance Range
Without compensator
With compensator
~30 nm to λ/2
0 to λ/2
Transmitted Wavefront Distortion ≤ λ/4
Surface Quality (scratch-dig) 40-20
Beam Deviation ≤ 2 arc min
Reflectance (per surface) ≤ 0.5% at normal incidence
Temperature 0˚C to +50˚C
Laser Damage Threshold 500 W/cm2, CW
300 mJ/cm2, 10 ns, visible
 

 

Ordering Information - Liquid Crystal Variable Retarder
Clear
Aperture
in. [mm]
Diameter
± 0.005 in.
[± 0.13 mm]
Thickness
in. [mm]
Part Number
Without Attached Compensator (30 nm to λ/2)
0.37
[9.4]
Ø1.00
[Ø25.4]
1.23
[31.2]
LVR-100
0.70
[17.8]
Ø2.00
[Ø50.8]
0.75
[19.1]
LVR-200
1.60
[40.6]
Ø3.00
[Ø76.2]
1.00
[25.4]
LVR-300
With Attached Compensator (0 nm to λ/2)
0.37
[9.4]
Ø1.00
[Ø25.4]
1.23
[31.2]
LRC-100
0.70
[17.8]
Ø2.00
[Ø50.8]
0.75
[19.1]
LRC-200
1.60
[40.6]
Ø3.00
[Ø76.2]
1.00
[25.4]
LRC-300

We offer standard liquid crystal retarders to cover four spectral regions:

  • VIS: 450 - 700 nm
  • IR1: 650 - 950 nm
  • IR2: 900 - 1250 nm
  • IR3: 1200 - 1700 nm
Please specify spectral region when placing your order
For temperature control options, append-TSC to part number.