Liquid Crystal-based Polarization Modulators

The FPM (Fast Polarization Modulator) series consists of liquid crystal based polarization modulators, which are able to vary the polarization of the transmitted light by an external voltage very fast. The components work vibration-free without moving components. This technique is used in Active retarder 3D displays.

Fast Polarization Modulators – Models

ModelNumber of
polarization
output states
TransmittancePolarization
contrast*
Response time**
(T100-T10)
Relaxation time**VD
FPM(L)2≥ 43.5 %≥ 60:1
≥ 1,800:1
≤ 6 ms≤ 30 ms4 V
FPM(L)-NIR(1100)2≥ 40.0 %≥ 200:1
≥ 300:1
≤ 5 ms≤ 15 ms5 V
X-FPM(L)2≥ 43.5 %≥ 20:1
≥ 1,800:1
≤ 30 µs≤ 1.8 ms24 V
X-FPM(4L)4≥ 41.0 %≥ 120:1
≥ 30:1
≥ 500:1
≤ 30 µs≤ 1.8 ms24 V
X-FPM(L)-LASunder development
PolarSpeed-M(L)2≥ 42.0 %≥ 20:1
≥ 120:1
≤ 30 µs≤ 30 µs24 V
VPRcontinuous≥ 41.0 %≥ 75:1 all outputs≤ 10 ms all output changes ≥ 20°≤ 10 ms all outputs
≥ 20°
9 V

* The polarization contrast is defined as the ratio of the desired polarization to the orthogonal component. The lower value applies to the polarization at applied voltage. The higher value applies to polarization without applied voltage.
** The switching time is defined as the time required to switch from polarization without applied voltage to polarization with applied voltage.
The relaxation time is defined as the time required to switch from polarization with applied voltage to polarization without applied voltage.

Sizes

Standard sizeOuter dimensionsClear aperture
7x87,0 mm x 8,2 mm5.0 mm x 5.0 mm
13x1513,0 mmx 15,0 mm9.8 mm x 9.8 mm
1x125.4 mm x 25.4 mm22.2 mm x 20.2 mm
2x250.8 mm x 50.8 mm47.6 mm x 45.6 mm
D1 (circular)25.4 mm diameter22.2 mm diameter
D2 (circular)50.8 mm diameter47.0 mm diameter