Electro-Optic Modulator


This low-cost EOM is available at frequencies from 5 to 20 MHz (standard models listed below), with other frequencies possible on request. It is the perfect solution for researchers wishing to stabilise single-frequency lasers by modulating a probe beam in a Frequency Modulation spectroscopy set-up, while leaving the main beam unaffected. The EOM can be mounted in a standard 1”mirror mount, allowing for simple placement and alignment within your optical setup.

The unit may be supplied with a suitable optional low-voltage oscillator. Coatings for different wavelength ranges are available.


Generation of side-bands on single-frequency lasers for high resolution locking techniques, such as frequency modulation saturation spectroscopy or stabilization to an optical resonator.


Specifications EOM-01

Resonant Frequency (xx MHz) 5, 6.25, 10, 12.5, 15, 20 (choose)
A.R. Coated (yy = λ range) U = 400nm-700nm
V = 650nm-1000nm
IR = 1100nm-1500nm
Aperture Diameter 3 mm
Crystal Material Lithium Niobate
Crystal Flatness Lambda/10
SWR at resonance <1.1:1 (typical)
Impedance at resonance 50 Ω (nominal)
Modulation Bandwidth 600kHz (-3dB) typical
Diameter 25.4 mm (1”)
Length 35 mm

Optional Driver

Manufacturer Thurlby Thandar
Model TG120
Description Function Generator
Frequency 0.2Hz to 20MHz
Output Voltage 10mV to 20V (pk-pk)

Optional Amplifier

Frequency Response 0.4-150 MHz
Gain 20dB
Max Input 1
Max Output 10V
Input/Output Impedance 50 Ω/50 Ω
Dimensions (HxWxL) 67mm x 204mm x 180mm
Weight 1.6 kg
Power Supply 240Vac(Max power 50VA)
Connectors BNC Input and Output