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. | EM200A | 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 | 45°y-cut | 45°y-cut | z-cut |
| Wavelength Range | 0.3 - 1.0µm | 0.2 - 1.2µm | 0.5 - 4.0µm |
| 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--- | ||
EM200 electro optic modulator drawing