Microcavity platforms

Cavity physics made simple.

The Qlibri microcavity platform simplifies high-finesse cavity experiments, delivering unmatched stability even within a vibration-prone cryostat. With turnkey control, flexible signal collection, and expert support, it’s the fastest path from concept to breakthrough in cavity physics.

"It’s like having the master minds behind open fiber cavities right in our lab, helping us push the boundaries of our research."

Prof. Dr. Klaus Jöns
Universität Paderborn

Complete microcavity package

Get started immediately with a complete cutting-edge solution including electronics, mechanics and optics.

Stability

Planar–concave Fabry–Pérot microcavity on a custom-engineered, ultra-stiff positioning system.
Passive damping stage mechanically decouples the system from environmental vibrations.
Continuous cavity length and lateral tuning over millimeter ranges with sub-nanometer stability.

Software

Measurement and analysis modules in Python for easy and fast data acquisition and integration with your lab routines.
Easily extendable to support additional hardware (e.g., spectrometers, lock-in amplifiers)
FPGA-based, low-noise controller for fast, precise cavity control

Support

Guidance in experiment planning
Simulation and design of optimized cavity parameters
Hands-on troubleshooting and technical assistance

Versatility

Broad range of stock and custom cavity mirrors, all easily swappable to suit diverse applications

Performance specs

Spectral range

350 - 2000 nm

Broad VIS/NIR coverage with exchangeable mirrors

Scanning range room temperature

100 x 100 µm²

Fast room temperature imaging

Scanning range low temperature

10 x 10 µm²

Fast low temperature imaging

Cryostat compatibility

< 10 K

Reliable operation at cryogenic temperatures

Spectral bandwidth

Δλ > 150 nm

Broadband mirror coatings for variety of experiments

Magnetic field

Up to 150 mT

Optional Helmholtz coil integration

Stability

< 10 pm

Exceptional stability, even in a closed-cycle cryostat

Mode volume

V < 2λ³

Small mode volume for efficient interaction with single emitters

Finesse

F>10⁵ | Q>10⁶

Ultra-high reflectivity for strong light–matter coupling

What can be coupled?

Defects in diamond:

NVs, SiVs, SnVs...

Quantum dots:

Perovskites, epitaxial...

2D materials:

TMDs, HbN...

And many others

.................

How it Works

A microscopic concave fiber-based mirror and a planar macroscopic sample mirror create a high-finesse Fabry–Perot resonator.
The planar mirror doubles as the substrate, allowing direct placement of materials into the cavity mode.
Both mirrors are mounted on an ultra-stiff positioning system, mechanically decoupled from vibrations with a passive damping stage.
The system enables continuous cavity length tuning and lateral scanning over millimeter ranges with cryostat-ready stability
Light is coupled into the cavity via the fiber mirror, and signals are collected either in free-space transmission or fiber reflection allowing flexible readout.

Scanning cavity technology

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

Optional upgrades

Magnetic field integration

Optional Helmholtz coil module applies magnetic fields (hundred milliTesla) perpendicular to the resonator axis which is ideal for experiments requiring spin or magneto-optical control.