Waveguide LasersCopyright: Fraunhofer ILT
The Chair for Laser Technology works on the research and development of structured planar waveguide lasers.
For the first time it was possible to detect laser activities in structured waveguides consisting of amorphous Nd:Ga5Gd3O12. The basis for the development of waveguide lasers are structured ridge waveguides composed of laser active films, which get polished, equipped with resonator mirrors and pumped by diode lasers.
Planar, structured waveguide lasers allow direct pumping by high power diode lasers because of their adapted geometries and the high numerical aperture. Deposition and structuring of the active thin film in contact with the pump laser diode allows highly integrated laser sources and low-cost mass production. Therefore, the quality of deposition and structuring at low processing temperatures is tested, as well as the direct integration of the waveguides with mounted diode laser bars. In cooperation with industrial partners different additional laser materials for additional wavelengths are investigated, especially in the visual range. In quest for new laser materials, the flexibility in processing different materials typical for both Pulsed Laser Deposition and fs-laser micro-structuring is a striking advantage. Up to now, investigations have been performed for structured films made up of Er:BaTiO3, Nd:YAG, Nd:GGG, amorphous Nd:Ga5Gd3O12, Er:ZBLAN and Er,Yb:ZBLAN.