Laser technology is used in many areas, where precise measurements are required and in communication. This means that they are important for everything from self-driving cars to the fibre optic internet and for detecting gases in the air.
Now, a research group has come up with a new type of laser that solves several problems associated with cuurent-day lasers. The group is led by Associate Professor Johann Riemensberger at the Department of Electronic Systems at the Norwegian University of Science and Technology (NTNU).
"Our results can give us a new type of laser that is both fast, relatively cheap, powerful and easy to use," says Riemensberger.
A new article about the findings has now been published in an article in Nature Photonics.
The work is a collaboration between NTNU and the Swiss École Polytechnique Fédérale de Lausanne (EPFL) and Luxtelligence SA.
Conventional precision lasers can be large, expensive, and difficult to adjust.
"Our new laser solves several of these problems," says Riemensberger.
This means that the laser can be used in self-driving cars, for example. These cars use an optical remote sensing technique called Lidar to detect and judge the distance to objects in their surroundings.
The technique measures time differences or changes in the wave phase between the light emitted from the laser and what is reflected back. This laser measures with high precision, around four centimeters.
The researchers also got good results when they used the laser to detect hydrogen cyanide gas in the air. This is a chemical compound that is often called "hydrocyanic acid". It is highly toxic in small doses, so it can be important to detect it quickly.
The researchers created the new laser with advanced materials and microscopic light circuits.
The laser emits a powerful and stable beam of light. Also, among the advantages is that users can easily adjust the frequency quickly and smoothly, without sudden jumps.
"You can also easily control it with just one control instead of many," Riemensberger points out.
The laser is built using chip technology that is already available. This makes it possible to mass-produce it cheaply.
"Our findings make it possible to create small, inexpensive and user-friendly measuring instruments and communication tools with high performance," Riemensberger said.
The work was a collaboration between EPFL (experiments), Luxtelligence SA (chip production) and NTNU (design and simulations). It started when Riemensberger was still a postdoctoral fellow at EPFL. The collaboration continues through an EIC Pathfinder OPEN scholarship called ELLIPTIC.
Reference:
Siddharth, A., Bianconi, S., Wang, R.N., Qiu, Z., Voloshin, A.S., Bereyhi, M.J., Riemensberger, J. and Kippenberg, T.J., Ultrafast tunable photonic-integrated extended-DBR Pockels laser . Nature Photonics. 05 June 2025. DOI: 10.1038/s41566-025-01687
Nature Photonics
Experimental study
Not applicable
Ultrafast tunable photonic-integrated extended-DBR Pockels laser
5-Jun-2025