White light generation with ultra-short pulses in silicon nitride waveguides

When ultra-short laser pulses with extreme high peak intensities propagate through a medium it is possible that the monochromatic laser light evolves into white light due to nonlinear interactions with the material. These extremely broadened spectra are called supercontinua.

To generate efficiently a supercontinuum the laser light has to propagate through a waveguide, where it is confined in space as well as in frequency. In this project the waveguide has a higher index core made of Si3N4 which is surrounded by lower index material like SiO2 and air.

The goal of this project is to couple ultra-short laser pulses into silicon nitride waveguides with different cross sections and observe the spectral broadening of the laser pulses. The results can be compared to numerical simulations and lead to a better understanding of the nonlinear interactions in silicon nitride waveguides.

This project allows to gain insight into the research field of photonics and nonlinear optics. In addition, there is also the opportunity to work on numerical simulations of nonlinear processes.


Prof. Dr. Klaus Boller
Marco Garcia Porcel MSc.


White light generation with ultra-short pulses in waveguides