Electro-Optic Modulators

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We offers a line of highly efficient electro-optic modulators (EOM) for scientific and industrial applications mainly in laser frequency stabilization, laser spectroscopy and laser cooling. 



Our company represents QUBIG GmbH, QUBIG GmbH specializes in design and manufacturing of world-class electro-optic modulators (EOM) for scientific and industrial applications requiring optical sidebands on free space lasers. Large apertures, outstanding modulation efficiency and selected crystals make our supplier's EOMs the right choice even for high-power lasers from UV to IR wavelengths. Available in quick delivery standard models and challenging custom developments.



Electro-optic modulators (EOMs) are an easy to use and efficient tool to externally modify the phase, frequency, polarization or amplitude of a free-space laser. In contrast to acousto-optic modulators the spatial mode of the laser beam remains unaltered. So EOMs are an ideal choice when several frequency components are required in the laser spectrum. For instance in repumper frequency generation in laser cooling and quantum optics, spectral broadening to minimize stimulated Brillouin scattering (SBS) in high power fibers, and for frequency modulation (FM) techniques, like FM Spectroscopy, Modulation Transfer Spectroscopy or Pound-Drever Hall (PDH) Laser Frequency Stabilization. The modulation spectrum of our electro-optic modulators ranges from dc-coupled phase shifters to high-Q, resonant EOMs in the MHz to GHz range.


Specification Range

  • radio frequencies: 0.1 MHz - 3 GHz
  • wavelength range: 200 nm - 5 μm
  • crystal apertures: 3x3, 5x5 mm
  • standard AR coatings: broadband, single line
  • high optical damage threshold crystals
  • low residual amplitude modulation (RAM)
  • low rf drive power
  • easy alignment


Laser Spectroscopy & Optical Frequency Locking

EO - Fxyz - AR

Resonant, High-Q EOM

highly efficient modulation with low rf drive power when the exact modulation frequency (± 5%) is insignificant, as in most heterodyne techniques.

sample datasheet inquire
EO - Txyz - AR

Tunable, High-Q EOM

manually tunable resonance frequency (± 30%) for fine-tuning to a pre-defined frequency or fixed frequency source. High modulation efficiency.

sample datasheet inquire
EO - BByz - AR

Broadband EOM

multi-octave bandwidth (5-50MHz) with limited modulation depth (< 10% sidebands), but ideal for setting the phase of a heterodyne signal.

sample datasheet inquire
EO - Dxxyz - AR

Double-Resonance EOM

for two (or more) independent modulation frequencies, like in two-tone FM (TTFM) spectroscopy, or multiple PDH locks. Also good for extended tuning range.

sample datasheet inquire

Special Purpose – Electro-Optic Modulators

EO - X100yz - AR

Spectral Broadening EOM

to reduce unwanted nonlinear effects with intense lasers like stimulated Brillouin scattering (SBS), or to increase capture velocity in laser cooling.sample datasheet inquire
EO - ..xyz - AR

Custom Developments

UV wavelengths, temperature stabilization, individual housing or connectors, high laser and/or RF powers, heat-sinking options, custom coatings or crystals, ...please contact us for details

Alkali Repumper Frequencies for Spectroscopy and Laser Cooling

Resonance frequency
Tuning range
AR coating
228 MHz 
± 30 MHz 
671 nm 
813 MHz 
± 60 MHz 
671 nm
1713 MHz 
± 100 MHz 
589 nm
441 MHz 
± 40 MHz 
766 nm
1285 MHz 
± 100 MHz 
766 nm
241 MHz 
± 30 MHz 
766 nm
2915 MHz 
± 100 MHz 
780 nm
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Sample datasheets EO-Li6-yz EO-Li7-yz EO-Na23-yz EO-K39-yz EO-K40-yz EO-K41-yz EO-Rb85-yz


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