Manufacturers and Suppliers of Electro-Optic Components

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

EM200 low voltage elctro-optic modulator

EM 200A

This is a low voltage ADP transverse 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 therfore 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 ration 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.

Product Specification

Model No. EM 200A EM 200K EM 200L
Crystal Type ADP KD*P LiNb03
Aperture 2.2mm 2.2mm 2.2mm
Crystal Length 4 x 20mm 2 x 40mm 2 x 20mm
Half Wave Voltage at 633nm 220V 220V 220V
Crystal Orientation 45y-cut 45z-cut z-cut
Wavelength Range 0.3 - 1.0m 0.2 - 1.2m 0.5 - 4.0m
Windows BK7 BK7 Quartz
Max. Continuous Applied Voltage 250 250 400
Extinction ratio 100:1 200:1 200:1
Capacitance 60pf 40pf 60pf
Cell Diameter 40mm 40mm 40mm
Cell Length 110mm 110mm 110mm
Optical Transmission > 85% > 90% > 90%
Connectors ---BNC---

All modulators are supplied Dry Nitrogen Filled.
Download the Interface Drawing

Download Interface Drawing

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