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Low Voltage Electro-Optic Light Modulators
Type: EM 200A, EM 200K & EM 200L

EM 200A

This is a low voltage ADP transverse electro-optic modulator designed to operate at all wavelengths in the visible and is entirely free from piezo-electric resonances. This modulator has a high degree of temperature stability, but where long term d.c. amplitude is required it should be operated in a constant temperature environment. The modulation frequency is not limited by the device characteristics other than by its electrical capacitance and therefore depends on the drive circuit used. Wide band ar-coatings are used on all components.

EM 200K

This is a low voltage transverse KD*P electro-optic modulator designed to give maximum thermal stability beyond that obtained by the ADP type. Its transmission range is extended into the infra-red and its extinction ratio is also better than that obtained from its ADP counterpart. It does however display piezo-electric characteristics.

EM 200L

This is a low voltage transverse electro-optic modulator using high damage threshold lithium niobate. It has similar characteristics to the EM 200K with an optical range extended further into the infra-red.

Low voltage electro-optic light modulators specifications

Model No.EM200AEM 200KEM 200L
Crystal TypeADPKD*PLiNb03
Crystal Length4 x 20mm2 x 40mm2 x 20mm
Half Wave Voltage at 633nm220V220V220V
Crystal Orientation45°y-cut45°y-cutz-cut
Wavelength Range0.3 - 1.0µm0.2 - 1.2µm
0.5 - 4.0µm
Max. Continuous Applied Voltage250250400
Extinction ratio> 100:1> 200:1> 200:1
Cell Diameter40mm40mm40mm
Cell Length110mm110mm110mm
Optical Transmission> 85%> 90%> 90%
All modulators are supplied Dry Nitrogen Filled.
EM200 electro optic modulator drawing

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