Low Voltage Electro-Optic Light Modulators
Type: EM 200A, EM 200K & EM 200L
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.
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.
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.||EM200A||EM 200K||EM 200L|
|Crystal Length||4 x 20mm||2 x 40mm||2 x 20mm|
|Half Wave Voltage at 633nm||220V||220V||220V|
|Wavelength Range||0.3 - 1.0µm||0.2 - 1.2µm||0.5 - 4.0µm|
|Max. Continuous Applied Voltage||250||250||400|
|Extinction ratio||> 100:1||> 200:1||> 200:1|
|Optical Transmission||> 85%||> 90%||> 90%|
EM200 electro optic modulator drawing