Cavity Locker

Control system for experiments on optical resonators for use in lasers

Laser cavity locker
The request

Our client needed a tool to maintain resonance in an optical cavity in a laboratory setting. During the experiments, measurements were taken of light absorption by rarefied gases.

In consultation with CNR researchers, we decided to control the resonance through piezoelectric transducers. Resonance was monitored through an optical pulse counter.

Due to the rapid speed of the signals being detected by the analog components, a great deal of effort went into tuning the mechanism for reading them.

Challenges faced
Solutions implemented

The requirements
  • Design a tool for the acquisition of weak signals for scientific research
  • Implement a firmware with real-time guarantees
  • Production of samples
Develer’s contribution
  • Electronic schematics, master PCB
  • Tested and built prototypes
  • Embedded real-time C code
  • Documentation for production and tests
  • Higher than expected performance
  • Highly configurable and flexible firmware
  • Simple and productive interface
Advantages of our solution

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Advantages of our methodology

We quickly created a series of prototypes of the most important components. This let us tune and perfect these critical parts before having the tool ready. As a result, the first version of the tool performed to specification, saving the client time and money.

Advantages of Open Source

The tool’s firmware is based on BeRTOS, our open source real-time operating system. The ready-to-use services and drivers provided by this foundation save time by letting us quickly incorporate third-party peripherals (LCD, keyboard, USB, etc).


CNR – Istituto per le Scienze dell’Atmosfera e del Clima


“It is very satisfying to be able to contribute tools used in scientific research.”

Daniele Basile Embedded developer @Develer