High-speed modulation thanks to crystal symmetry

A team led by Giancarlo Soavi has developed a method for non-linear signal modulation. Image: Anne Günther (University of Jena) - Nonlinear optics is of paramount importance in numerous fields of science and technology, in particular for second harmonic generation, namely the process of frequency doubling of a light beam. For instance, this process turns invisible infrared light into the visible light cursor of a laser pointer. In spectroscopy, this method allows to reach new wavelengths that are otherwise not available using conventional laser sources. There are also important applications in the field of photonic data transmission, quantum communication and sensing technology. As an example, by switching on and off the second harmonic conversion efficiency one can store any information into a light beam. To fully exploit the potential of this technology, the second harmonic modulation must be as fast and efficient as possible.