Electro-optic modulators 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. RELATED PRODUCTS Q-Switches / Pockels Cells High voltage modulator drivers 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. 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 45°y-cut 45°z-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--- Download drawing All modulators are normally supplied Dry Nitrogen Filled. Electro-optic Phase Modulators For fixed frequency operation electro-optic phase modulators can be designed to operate up to at least 2 GHz. By making the electro-optic crystal part of a tuned circuit, relatively low drive voltages can be used to achieve up to p radians of phase modulation. For the range 50 MHz to 1 GHz the optical element is made part of a lumped tuned circuit and above 1 GHz the optical element is made part of a re-entrant tuned cavity or the active component in a traveling wave system. For the tuned circuit arrangements the drive power required from the source is usually less than one watt. These phase modulators can currently only be supplied without a drive source. General Specifications for electro-optic phase modulators 1. PM50-500 (50 MHz to 500 MHz version) Outline Drawing of Phase Modulator Head Optical wavelength range 600 - 1300 nm (Lithium Tantalate) Crystal Configuration Brewster cut or ar/ar normal incidence rod Aperture 2mm RF Drive power 2 watt maximum for p radians Tuning range of optical head ± 15% of center frequency Voltage gain from tuned circuit ~ 100 Input impedance of head ~ 50 Ω Note: These are typical specifications taken from a phase modulator operating at 100 MHz. 2. PM1000-2000 (1 - 2 GHz version) Optical Wavelength range 600 - 1300 nm Lithium Tantalate 200 - 600 nm (ADP) Typical Crystal Configuration 15mm long, 2mm Æ rod, ar/ar Aperture 1.5mm maximum Tuning range of cavity ± 5% of design frequency Cavity Q > 100 Cavity design impedance ~ 50Ω Cavity overall dimensions 50mm Ø x 50mm length (2 GHz version) Drive Power 0.5 - 2.5 watts

 

ELECTRO OPTICAL COMPONENTS, Inc.

Low voltage electro-optic light modulators and phase
modulators manufactured by LEYSOP are distributed exclusively
in North America by ELECTRO OPTICAL COMPONENTS, Inc.

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Name (Required) Title Company (Required) Email address (Required) Phone (Required) Fax  What, specifically, would you like to know? Please provide your complete mailing address to receive literature package: Address: Bldg/Suite/Mail Stop City State Zip Code     ELECTRO OPTICAL COMPONENTS, Inc. is the exclusive North American  distributor for FEMTO, InfraTec, IFW, Laser Beam Products, LEYSOP, NOC, Frankfurt Laser Co., IMM Photonics GmbH, INTEX, SDS (Systems Development & Solutions), UralAlmazInvest, Oehler & Fischer AG and Wavelength Technology. EOC is also a distributor for Dexter Research.