Applications

Experimental setups in e.g. ultracold quantum gases allowing advances in modern Quantum Science & Technology are becoming increasingly complex machines, requiring reliable and specialized equipment. This technological need triggers "homegrown" custom developments of certain sophisticated components that are not readily available. However, these useful tools or gadgets are often outside the primary research focus. Therefore, it is not always possible to dedicate enough time and man power to fully develop such devices into a reliable prototype. Based on strong collaborations with several renowned research institutes, QUBIG GmbH refines those prototypes with the goal to make tested, reliable and very sophisticated tools available for other labs.


Our products are conceived for a broad application spectrum, ranging from optics, laser technology to eletronics. Below, each product and its main applications is described, for an efficient and simple integration of that product in your setup.

Electro-Optic Modulators

Pound-Drever-Hall Technique, Laser/Cavity Lock

The Pound-Drever Hall (PDH) technique is a popular and elegant technique to frequency stabilize lasers (e.g. diode lasers) to a reference optical cavity (e.g. Fabry-Perot cavity) in a so-called “laser lock”, thereby also drastically reducing the laser linewidth. Alternatively the PDH-lock can be used to actively stabilize the length of an ...

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FM Spectroscopy

Frequency Modulation (FM) Spectroscopy is a great and sophisticated method to enhance the sensitivity in laser spectroscopy. It is a heterodyne technique and determines the phase shift imposed on a probe beam by an atomic or molecular line rather than it’s typically very weak absorption signal. ...

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Electro-optic Effect

A tuned rf cavity (tank circuit) boosts the applied voltage by a factor of ~100 across the electro-optic crystal. The alternating voltage induces a change in the crystals refractive index, thereby modulating the phase of a linearly polarized laser field passing through it. Since a time-varying phase is equivalent to a frequency, this modulation is expressed in the formation of sidebands on a monochromatic laser at +/- the drive frequency...

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