Qubig GmbH(德国)


Greimelstr. 26 83236 Übersee Germany
+49 152 21 83 36 48
+49 8665 37 40 37
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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 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

Electro-optic modulators (EOMs) are efficient and easy to use tools to 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. Therefore, EOMs are the ideal choice when several frequency components are required in a laser spectrum. For instance, in laser cooling repumper frequency generation, ion trapping and quantum optics, for spectral broadening to suppress stimulated Brillouin scattering (SBS) in high power fibers, and for heterodyne 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 kHz, MHz and GHz range. Large apertures and a range of selected crystals materials (AR-coated or Brewster-cut) permit the use of high power lasers at UV to IR wavelengths.

Key Features

  • Modulation Frequencies: DC - 14.7 GHz (DC-coupled, Resonant, and Traveling-Wave Models)

  • Wavelength Range: UV - MIR (190nm - 10.6 μm, with a selection of dedicated crystals)

  • Large Apertures for easy Alignment and High Laser Power (Standard: 3x3mm, 5x5mm)

Product Matrix

Laser Spectroscopy & PDH Frequency Stabilization Optical Frequency Locking

High Efficiency EOMs

Resonant, high-Q phase modulators with resonance frequencies from kHz - 250MHz and ultra-low RAM for PDH, FM and MT.
Options: Tunable, T-control, DC-port, ...


High Frequency, GHz Modulators

Resonant, high-Q EOMs up to 2.5GHz with tunable resonance frequency and thermal crystal mount for high power operation.
Dedicated repumper models.

EO-T412L3 EO-F1000M3 EO-T1055M3-TXC


High efficiency and high frequency GHz EOMs with dedicated UV crystals and sealed housings for ultraviolet wavelengths from 190 - 400nm e.g. for trapped ions.



Resonant phase modulators for the infrared (IR and MIR > 10.6μm) with high efficiency crystals up to 5μm for QCL spectroscopy and PDH. (GHz models on request)

EO-T0.5L3-IR2 EO-T50T3-IR4

Special Purpose Electro-Optic Modulators

Spectral Broadening EOMs

kHz, MHz and GHz EOMs with high efficiency and high power options (heat-sink) for strong modulation (> 2.6rad, up to 40rad) to suppress SBS or increase capture velocities.

EO-F200M3 EO-F1100L3

Phase Shifter

DC-coupled electro-optic phase shifter (Brewster or AR) with high bandwidth for fast intra-cavity feedback of narrow linewidth lasers. Miniature models available.


Polarization / Amplitude Modulators

High damage threshold polarization modulators (DC-coupled or resonant up to 100MHz) with large acceptance angle. Amplitude modulation with ext. polarizer.

AM-F0.1R4 AM-T70R3

Microwave EOMs

Broadband traveling-wave type or tunable, resonant electro-optic modulators for microwave frequencies up to 14.7GHz. Please contact us for details.


Alkali Repumper Frequencies for Spectroscopy and Laser Cooling of neutral Atoms

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

Sample datasheetsEO-Li6EO-Li7EO-Na23EO-K39EO-K40EO-K41EO-Rb85

Repumper Frequencies for Spectroscopy and Laser Cooling of Ions

Resonance frequency
Tuning range
AR coating
1250 MHz 
± 100 MHz 
313 nm
1789 MHz 
± 100 MHz 
280 nm 
1938 MHz 
± 100 MHz 
397 nm
5.00 GHz 
± 100 MHz 
422 nm
2105 MHz 
± 100 MHz 
369 nm

Sample datasheetsEO-Be9+EO-Mg25+EO-Ca43+EO-Sr87+EO-Yb171+


Advanced Driver Unit - ADU

The Advanced Driver Unit (ADU) is a user-friendly RF driver specifically designed for resonant EOMs. It combines a precision radio-frequency source (DDS) with optional power amplifier and several useful features needed for laser spectroscopy and frequency stabilization (PDH). It’s simple, push-button operation and automatic lock & track function, make it an ideal solution for users requiring a stand-alone, trouble-free EOM driver always operating on the EOMs optimal working point. Besides ensuring stable operation (amplitude & phase of the optical modulation) this potentially saves expensive analytical equipment, like an optical spectrum analyzer (e.g. scanning Fabry-Perot cavity). For more complex applications the ADU offers several input and output ports as well as PC control software (free) which can be embedded in experiment control sequences.

ADU - Dedicated Resonant EOM Driver (1 - 200 MHz)

  • DDS based precision RF Synthesizer (resolution: 0.1Hz, stability: 100ppm (internal) or external reference)

  • RF Power: 20dBm (resolution: 0.1dB), high power version ADU/HP with Pout: 30dBm, more on request

  • Plug-in unit (3HU, 28TE) for 19” systems (req. 5/12VDC) or standalone bench-top version, fanless = silent

  • provides clean 12V supply for fast, trans-impedence amplified photodetector (PD-AC100)

  • automatic resonance frequency locking & tracking (ditherless)

  • internal heterodyne frequency mixing circuit (PDH), precision phase adjust (< mrad), high conversion, 3xf0

  • front-panel & remote PC controllable (USB), free software, digital in-/outputs, interlock, auto-recovery

  • EMC shielded with ultra-low noise linear power supplies (optional, for mains voltage 110/220VAC)

Main Applications:

  • Frequency Modulation (FM) Spectroscopy, Modulation Transfer (MT) Spectroscopy

  • Laser Frequency Stabilization, Optical Cavity locking, Pound-Drever Hall lock (PDH)

  • Spectral Broadening

  • Precision Optical Phase Control (e.g. for Dynamic Optical Lattices)

  • Resonant Electro-Optic Amplitude Modulators

ADU - standalone versiontypical application: Pound-Drever Hall lock

Extended Driver Unit - EDU

With the Extended Driver Unit (EDU) Series Qubig offers an economic and user-friendly solution for high power radio-frequency sources in the GHz-range as ideal drivers for high-frequency and GHz EOMs. It features a compact, modular design with a wideband, RF generator module along with a suitable RF power amplifier module. Both modules can be used independently and can packaged in a stand-alone benchtop version or up to 6 modules in a 19” rack system for mains voltage 110/220VAC with ultra-low noise linear power supplies.

EDU - High Frequency EOM Driver Module (0.1 - 4.4 GHz)

  • Wideband RF Generator, PLL based (resolution: 10 kHz, stability: 2.5ppm)

  • RF Power: 19dBm (resolution: 0.5dB) - seed signal for AMP RF amplifier modules

  • Plug-in unit (3HU, 14TE) for 19” systems (requires 5VDC), SMA connector

  • compact, modular design

  • full front-panel control (encoder & display), manual & digital (TTL) on/off

  • intuitive operation with auto-save and auto-recovery

AMP - RF Amplifier Modules (0.01 - 3.2 GHz)

  • broadband (up to 0.9, 2.2, 2.8 GHz) and narrow-band (1.6-1.8, 2.0-2.2, 2.4-2.7, 2.9-3.2 GHz) versions

  • RF Power: 2W, 5W or up to 10W (40 dBm) - designed for EDU seed signal

  • Plug-in unit (3HU, 14TE) for 19” systems (requires 24VDC), SMA connectors

  • compact, modular design

  • highly efficient with passive heat-sink (fanless = silent)

  • fully protected (unmatched load, over-temperature)

BOX - Standalone Benchtop Box or 19” Rack System

  • full (84TE), half (42TE) or 1/3 (28TE) 19” rack or benchtop box for 2, 3 or 6 modules (EDU, AMP)

  • matched ultra-low noise linear power supplies for mains voltage 110/220VAC

  • EMC shielded, fanless = silent

Example: High Frequency EOM Driver for a Double-Resonance EOM
2 EDU modules + 1 AMP module packaged in a BOX standalone benchtop version


Fiber Modulators / Photline

Qubig GmbH is proud to announce a strategic partnership with Photline Technologies, France to mutually strengthen its portfolios by distributing each others products in France and Germany, respectively. This allows us to always offer the best solutions for each customers particular electtro-optic modulation application. Whereas Qubigʼs free-space resonant EOMs satisfy with ultra-low optical loss (<1%), high laser power handling (>10W cw) and wide wavelength ranges down to UV, the integrated fiber modulators by Photline technologies offer uncompromising bandwitdh (>10 GHz) and modulation efficiency in both phase/- and intensity modulator (Mach-Zehnder) configurations.

Fiber Modulators

Photline Technology electro-optic fiber modulators offer wide bandwidth (>10GHz), high efficiency (low halfwave voltage Vpi), excellent extinction ratios (Mach-Zehnder Modulators) and good optical power handling in the NIR - IR wavelength range.

Phase ModulatorsIntensity Modulators
780 – 850nmNIR-MPX800-LN Series
-0.1: 150 MHz, Vpi: 2V
-05: 5 GHz, Vpi: 3V
-10: 10 GHz, Vpi: 4V
optical insertion loss: 3.5dB
max. optical power: 25mW
NIR-MX800-LN Series
-10: 10 GHz, optical IL: 3.5dB
-20: 20 GHz, optical IL: 4.5dB
Vpi: 3.5V
max. optical power: 20mW
980 – 1150nmNIR-MPX-LN Series
-0.1: 150 MHz, Vpi: 2.5V
-02: 2 GHz, Vpi: 3V
-05: 5 GHz, Vpi: 4.5V
-10: 10 GHz, Vpi: 5.5V
optical insertion loss: 3 dB
max. optical power: 100mW
10 GHz, Vpi: 4V
optical insertion loss: 5 dB
max. optical power: 100mW
extinction ratio: 30dB
1290 – 1330nm
10 GHz, Vpi: 4.5V
optical insertion loss: 3.5dB
max. optical power: 100mW
extinction ratio: 22dB
1530 – 1580nmMPX-LN Series
-0.1: 150 MHz, Vpi: 3.5V
-05: 4 GHz, Vpi: 9V
optical insertion loss: 3.5 dB
max. optical power: 100mW

MPZ-LN Series
-10: 12 GHz, Vpi: 7V
-20: 20 GHz, Vpi: 9V
-40: 32 GHz, Vpi: 10V
optical insertion loss: 2.5 dB
max. optical power: 100mW
MX-LN Series
-10: 12 GHz, IL: 2.7dB, Vpi: 4.7V
-20: 20 GHz, IL: 2.7dB, Vpi: 6.5V
-40: 30 GHz, IL: 4dB, Vpi: 6.5V
max. optical power: 100mW
extinction ratio: 22dB

MXAN-LN Series (for analog signals)
-10: 12 GHz, IL: 2.7dB, Vpi: 6.5V
-20: 20 GHz, IL: 2.7dB, Vpi: 8V
max. optical power: 100mW
extinction ratio: 22dB
1900 – 2200nmMPX2000-LN-0.1
150 MHz, Vpi: 4.5V
optical insertion loss: 3 dB
max. optical power: 100mW

10 GHz, Vpi: 10.5V
optical insertion loss: 3.5 dB
max. optical power: 100mW
MX2000-LN Series
-01: 2 GHz, Vpi: 5.5V
-10: 10 GHz, Vpi: 9.5V 
optical insertion loss: 4dB
max. optical power: 100mW
extinction ratio: 22dB

RF Amplifiers/Drivers

Wideband, linear RF amplifiers with low noise and flat group delay and gain curves. Optimized for analog modulation (phase/intensity) or pulse applications with low and high repetition rate. Single supply voltage with gain control.

10 GHzDR-AN-10 Series
gain: 30dB
supply: 12Vdc (1.2Vc) 350mA

-MO: 9 Vpp
-HO: 12.5 Vpp
DR-PL-10-MO Series
gain: 20dB, 6.5Vpp, rise/fall: 25 ns
supply: 12Vdc (0.4Vc), 370mA

-LR: 10Hz - 100MHz (rep.rate)
-HR: 50kHz - 1GHz (rep.rate)
20 GHzDR-AN-20 Series
gain: 30dB
supply: 12Vdc (1.2Vc) 350mA
-MO: 9 Vpp
-HO: 12.5 Vpp
several dedicated telecom drivers

Modulator Bias Controllers

Modulator Bias Controllers (MBC) are required to stabilize the operating point of Mach-Zehnder Modulators (Intensity-Modulators). For critical applications and to achieve high extinction ratios (ER) the use of an external tap-coupler (e.g. OP-PD/TAP-800, -1000, 1550) and the MBC’s internal photodiode is recommended.

DitherlessContinuously tunable
MBC-AN Series
-12/+12V bias
locking range: Quad Points
internal photodiodes & tap couplers
MBC-DG Series
-10/+10V bias
locking range: 360 degree
internal photodiode & tap coupler
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