Our products use optical microresonators to enhance the interaction between light and matter at the nanoscale.

Ultra-sensitive absorption microscope

Our microscope provides spatial-, spectral-, and time-resolved absorption measurements with exceptional sensitivity.

Measure spectrally and spatially resolved absorption of nanosystems at the parts-per-billion level. Gain new insight for material research and see what nobody else saw before.

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Cavity quantum optics platform

Our microscopic high finesse cavity enhances light-matter interactions for applications in quantum computation, single-photon sources, and other cutting edge research.

Use our quantum optics platform to sample thousands of inhomogeneous nanosystems like quantum dots, NV-centers, or 2D-Materials in a single run with the ability to perform quantum optics experiments on every single one of them.

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Scanning cavity technology

How our scanning cavity system works:

  1. An optical fiber with a small concave mirror.
  2. A large planar mirror.
  3. Place your sample.
  4. Find suitable nanoparticle.
  5. Couple to quantum systems / do spectroscopy.
  6. Publish!
  7. Repeat

Absorption microscope

Our novel microscope makes minuscule absorption of single nanoscale particles visible, which is not accessible otherwise. This enables researchers in nanotechnology, material science, and life sciences to get new label-free insight into nanoscale objects down to the single-particle level.


Measure absolute absorption cross sections of nanoscale matter. (Image: carbon nanotubes)


Reveal weak absorption signals and map tiny variations in absorption, e.g. in extended low dimensional materials (Image: 2D material heterostructure)

Spectrally resolved

Perform absorption spectroscopy at the parts-per-billion level on individual nanosystems (absorption below 0.0001% can be measured).


Absorption on the parts-per-million level can be imaged in real-time. Furthermore, time resolved measurements can be performed with 1µs time resolution.

Micro-cavity quantum optics platform

Our platform is a higly stable scannig micro-cavity system that can be operated in a closed cycle cryostat to strongly couple solid state quantum systems to light. The scanning approach enables you to look at thousands of different quantum systems, while the open cavity design greatly facilitates sample handling and exchange.

State of the art cavities

Finesse exceeding 100.000 and Q>106 with mode volumes of a few λ3.


We take care of the hard parts. Get ready to operate a cryogenic micro-cavity setup in weeks instead of years.

High stability

Passive and active stabilization reach length fluctuations below 1pm.


Get a cryogenic micro-cavity setup including mirrors, positioning, locking, readout, electronics, thermalization and user-friendly and customizable software.

Simple sample preparation and broadband measurements

Samples just need to be placed on the fused silica mirrors by stamping, spin-coating, drop casting or exfoliation. Many different quantum systems can be investigated using our various broadband coatings with Δλ=100nm.


Compatible with many closed-cycle and bath croystats


Qlibri is part of the project QR.X for developing a quantum repeater link based on color centers in diamond. We will contribute a stable and flexible micro-cavity that can be interfaced with microwave and RF-bias lines.

News from the lab: First complete hyperspectral microscopy image with noise floor well below 0.001% recorded in less than a second.

We received the prestigeous EXIST Forschungstransfer start-up grant from the German Federal Ministry for Economic Affairs and Energy (BMWi).

We had our first booth at the industry exhibition of the Quantum Science and Information Technologies Fall meeting of the German physical society (DPG). We showed a live demonstration of absorption microscopy of carbon nanotubes resolving absorption at the 0.0001% level.

We had our first booth at the industry exhibition of the Quantum Science and Information Technologies Fall meeting of the German physical society (DPG). We showed a live demonstration of absorption microscopy of carbon nanotubes resolving absorption at the 0.0001% level.

We received the prestigious Nano innovation Award from the Center for NanoScience (CeNS).

On the Single-Molecule Sensors and NanoSystems International Conference we showed the first life absorption measurement of our microscope.

On the European Quantum Technologies Conference in Grenoble we demonstrated 100fm resonator stability of our fully scannable cavity quantum microscopy platform (during the noisy poster session and at our hotel room).


During our work with fiber-based optical microresonators, we realized the enormous power of this technology and its great potential in many research areas. We want to cut down the complexity and time it takes to build and operate an optical fabry-perot microcavity to enable scientists from various fields to boost their research.

On this premise we develop complete setups including highly reflective mirros, mechanical design as well as electronics, software, and consulting to get our customers an operating microcavity setup in various enviroments as fast as possible. Our ultimate goal is to provide a "turn-key" solution that unlocks the power of optical microresonators in every laboratory.

Qlibri originates from the groups of David Hunger at KIT, Alexander Högele, and Theodor W. Hänsch at LMU Munich and the Max-Planck-Insitute of Quantum Optics, where research with fiber-based microresonators was pioneered.

Our team provides years of expertise in micro-cavity and nanophotonic research.

Dr. Thomas Hümmer
Dr. Jonathan Noé

We are lucky to be supported by excellent scientific advisors:

Prof. Theodor W. Hänsch, LMU
Prof. David Hunger, KIT
Prof. Alexander Högele, LMU

Awards and Funding

We are happy to be supported by the following institutions, prices and grants

Nano Innovation Award ERC LMU Max-Planck-Institut für Quantenoptik Bayern Innovativ BMBF Munich Center for Quantum Science and Technology EXIST


If you are interested to buy our cryogenic fiber optical micro-cavity quantum optics platform or cavity-enhanced microscope or have any question contact us by mail at [email protected] or telephone at +49 89 2180 2055.

We also offer fiber cavity mirrors for quantum optics experiments. You can buy stock or custom micro-cavity mirrors at