February 23, 2015

Frequency combs in the molecular fingerprint region

(Feb.23, 2015)  Silicon nanowire optical waveguides dramatically broaden mid-infrared frequency comb spectra.

In an article published in Nature Communications (February 20th, 2015), an international collaboration of scientists around Dr. Nathalie Picqué (Max-Planck Institute of Quantum Optics and Ludwig-Maximilians-Universität München) describes a reliable new technique of producing a broadband optical frequency comb in the mid-infrared region. In a lithographically fabricated silicon nanowire waveguide, the spectrum of a short-pulse laser is significantly broadened. Even at low pulse energies, octave-spanning phase-coherent frequency combs are generated.