Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 72: Ultrashort Laser Pulses III
Q 72.3: Vortrag
Freitag, 4. März 2016, 16:00–16:15, a310
Broadband supercontinuum generation in high-confinement Si3N4 integrated optical waveguides — •Florian Schepers1, Marco Garcia Porcel2, Jörn Epping2, Tim Hellwig1, Klaus-Jochen Boller2, and Carsten Fallnich1,2 — 1Institute of Applied Physics, University of Münster, Germany — 2MESA+ Institute of Nanotechnology, University of Twente, The Netherlands
A novel approach for the fabrication of stoichiometric silicon nitride (Si3N4) waveguides allows the realization of Si3N4-waveguides with an increased thickness of up to 1.2 µm1. This thickness enables anomalous dispersion in the near-infrared range. In addition the modal confinement for waveguides of such dimensions increases with the size of the waveguides. These two aspects make these waveguides highly desirable for the generation of ultra-broadband supercontinua. The waveguides can be designed such that the zero-dispersion wavelengths are favorable for pumping at multiple common laser wavelengths, importantly, around 1030 nm and 1550 nm where Yb- and Er-fiber lasers are available.
Using ultrashort laser pulses at a wavelength of 1064 nm as a pump wave, a supercontinuum with a bandwidth of 495 THz has been obtained2, spreading from 470 nm up to 2130 nm. This corresponds to the broadest supercontinuum ever generated on a chip.
Similarly, using pump pulses in the telecommunication range near 1550 nm, a supercontinuum spanning from 560 nm to more than 2100 nm wavelength has been generated.
1 Epping J., et al., Opt. Express 23, 642 (2015).
2 Epping J., et al., Opt. Express 23, 19596 (2015).