From UV to blue - reliable laser sources for environmental monitoring (RelyLa)

Emission spectra of a DFB and RW laser diode
Emission spectra of a DFB laser diode compared to an RW laser diode in pulsed mode.

The joint project will develop (Al, Ga, In)N based laser systems emitting in the ultraviolet (UV) to blue spectral band. The emission properties of the semiconducting material are tuned to detect environmental pollutants while maintaining high reliability of the devices, thus making them ideal for environmental monitoring in an industrial context. Depending on the field of application in environmental monitoring, distributed feedback (DFB) laser diodes, ridge waveguide (RW) laser diodes and optical amplifiers (SOA: Semiconductor Optical Amplifier) ​​with narrow linewidth, high optical power and high beam quality are realized.

The laser systems are designed to target wavelengths of 389 nm, 405 nm and 434 nm and can therefore be used for the excitation of lead, mercury and ammonia (after frequency doubling to 217 nm) in atomic, fluorescence or gas absorption spectroscopy. In addition to the above-mentioned applications, further fields of application are in medical technology, communication technology, production technology or metrology. The high reliability of the laser is mandatory and thus the key objective of the joint project.

The work is shared between two partners in Berlin, the company Eagleyard Photonics GmbH (eyP) and Ferdinand-Braun -Institut (FBH), and two partners in Poland, the company TopGaN and the Institute of High Pressure Physics of the Polish Academy of Science (Unipress). Production and optimization of the semiconductor layer structures and chip processing are performed by Unipress, TopGaN and FBH. Assembly and packing development as well as reliability tests are carried out by the system integrator eyP. The partners share the results of the different target wavelengths and device types. At the end of the project, reliable laser systems of the mentioned types and wavelengths will be available as test samples for industrial customers.

This project is co-financed by the European Regional Development Fund (ERDF)

Project time: Jan 1, 2018 – Dec 31, 2020