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Free Laser Beam Profiler Software

Open Source Project
Beam Inspector​​
n2photonics-2 (1) (1).png

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C. Franke, K. Fritsch, O. Pronin , N. Chunosov

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Problem

We regularly need to measure the laser beam profile of femtosecond lasers in the lab at each workstation. This beam characterization is necessary to ensure that the mode-matching of our multipass cells fits accurately to our customers' lasers. Additionally, we frequently include beam profilers with our modules as a useful tool to facilitate the remote installation of our pulse shortening (MIKSs) modules. Unfortunately, ordering a new commercial-grade laser beam profiler in every case is not affordable, and the full feature set is mostly not required for our application. 

Solution

We decided to sponsor the development of minimalistic, easy-to-use laser beam profiler software for widely available industrial cameras and open source the whole project under the GNU GPL v3.0 license for you to use! 

 

Contributors

  • Nikolay Chunosov, known from his reZonator project [1], wrote the software.

  • The n2-Photonics team tested the software in the lab and financially supported the project. 

 

Hardware

Currently, only IDS cameras supporting the IDS peak software (GenICam) are supported. The following cameras are tested:

 

Important Note

Commercial-grade beam profilers usually remove the cover glass on top of the sensor since it can introduce measurement artifacts (secondary reflections or interference fringes for coherent radiation [4]). We usually do not remove the protective glass from IDS cameras since the coherence length of our femtosecond pulses (<300 fs) is short enough to avoid artifacts. However, your experience may vary.

Where to download

Beam Inspector can be downloaded here [5]

Documentation

The manual and user notes are currently being prepared and will be added here on the same webpage.​​

Beam Inspector interface.jpg

 

Current main features

  • Basic control of the camera exposure parameters (exposure time, analog & digital gain)

  • Laser beam width, position, and ellipticity measurements according to ISOs 11146-1, 11146-2 and 11146-3.

  • Background subtraction

  • Area of interest selection

  • Laser beam parameter tracking for stability measurements

  • Beam position reference overlay

  • Analysis of static images

  • Variable color maps (perceptually uniform ones are recommended [6])

 

Feedback is highly appreciated either on the github or under info@n2-photonics.de!

References

Feedback is highly appreciated either on the github or under info@n2-photonics.de!

[1] http://www.rezonator.orion-project.org/

[2] https://de.ids-imaging.com/store/u3-3680xcp-nir-rev-1-2.html

[3] https://de.ids-imaging.com/store/u3-3180cp-rev-2-2.html

[4] https://www.eureca.de/files/glasscoverremoval_2019-09-24.pdf

[5] https://github.com/orion-project/beam-inspector/releases

[6] Crameri, F., Shephard, G.E. & Heron, P.J. The misuse of colour in science communication. Nat Commun 11, 5444 (2020). https://doi.org/10.1038/s41467-020-19160-7

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