Laser 2000

Liquid Crystal Optical Shutter

LCS and FCS Series

A liquid crystal shutter is a vibration-free alternative to a mechanical shutter that is especially convenient for use with polarized light beams.

Laser 2000 offers Twisted Nematic (TN) and Ferroelectric optical shutters.

Please refer to our Liquid crystal selection guide in the Downloads section.

Twisted Nematic High Contrast Shutter (LCS)

The TN 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 shutter is supplied with integral dichroic visible polarizers that function over the wavelength range of 450 nm to 700 to provide an average contrast ratio of better than 1,000:1 over this wavelength range. Shutters with larger aperture sizes and with wavelength coverage to 2.1 microns are available on a custom basis

Achromatic Ferroelectric (High Speed) LC Shutter (FCS)

Meadowlark Optics’ Achromatic Ferroelectric Polarization Rotator features high speed and exceptional polarization purity over broad wavelength ranges. FLC devices offer a significant performance advantage in optical shutter and rotator applications demanding the fastest optical response times available.

This product needs to be used with the FC-010 controller.

Rotator Specifications:
Retarder Material Ferroelectric liquid crystal
Substrate Material Fused silica
Wavelength Range 405 – 850 nm
custom ranges up to 2 microns
Transmitted Wavefront
λ/2 (P‐V @ 633)
λ/8 (RMS @ 633)
Surface Quality 60 – 40 scratch‐dig
Beam Deviation ≤ 5 arc min
Outside Diameter (mounted) 2.00 ± 0.005 in.
please inquire about custom sizes
Clear Aperture 0.70 in. (17.8 mm)
Response Time (10‐90% & 90‐10%) ≤ 100 µs at room temp
wavelength dependent
Operating Temperature 20˚C to 30˚C
Storage Temperature 0˚C to 60˚C
Driver Requirements ± 5 to 30 Volts,
50% duty cycle
Shutter Specifications
(rotator with polarizers – includes specifications from above table):
Polarizer Material Dichroic Polymer
please inquire about higher
transmission options
≥ 30% (typical ‐ unpolarized light)
≥ 65% (typical ‐ polarized light)
Wavelength Range 450‐720 nm, custom ranges up to 2 microns
Transmitted Wavefront
λ/2 (P‐V @ 633)
λ/8 (RMS @ 633)
Contrast Ratio ≥ 200:1
Controller Specifications:
Dimensions 5.3 in. W x 5.3 in. L x 2.0 in. H
13.5 cm W x 13.5 cm L x 5.1 cm H
Number of LC
Two, running identical programs
180 degrees out of phase
Output Waveform Bipolar ± 15V peak voltage, ± 10V
holding voltage
Amplitude Resolution 16‐bit; 1 mV voltage resolution
Internal Drive 1 to 10,000 Hz, 50% duty cycle,
frequency controlled by front‐panel
10‐turn knob
LC-Achromatic High Speed Polarization Rotators & Shutters
Liquid Crystal Selection Guide

Request a Demo

LCS and FCS Series

Ask the Expert

If you’re interested in the products shown here, or have questions about something you can’t find on our website, please get in touch through the form below.

Our knowledgeable sales team will be happy to help. We can normally source exactly what you need, or work with you to come up with custom solutions.

Alternatively, just call +44 (0) 1933 461 666 and ask to speak to the Photonics team.


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