Two-octave spanning supercontinuum generation in stoichiometric silicon nitride waveguides pumped at telecom wavelengths.
We demonstrate supercontinuum generation in stoichiometric silicon nitride (Si3N4in SiO2) integrated optical waveguides, pumped at telecommunication wavelengths. The pump laser is a mode-locked erbium fiber laser at a wavelength of 1.56 µm with a pulse duration of 120 fs. With a waveguide-internal pulse energy of 1.4 nJ and a waveguide with 1.0 µm × 0.9 µm cross section, designed for anomalous dispersion across the 1500 nm telecommunication range, the output spectrum extends from the visible, at around 526 nm, up to the mid-infrared, at least to 2.6 µm, the instrumental limit of our detection. This output spans more than 2.2 octaves (454 THz at the -30 dB level). The measured output spectra agree well with theoretical modeling based on the generalized nonlinear Schrödinger equation. The infrared part of the supercontinuum spectra shifts progressively towards the mid-infrared, well beyond 2.6 µm, by increasing the width of the waveguides.
Marco A G
MA
Porcel
Florian
F
Schepers
Jörn P
JP
Epping
Tim
T
Hellwig
Marcel
M
Hoekman
René G
RG
Heideman
Peter J M
PJ
van der Slot
Chris J
CJ
Lee
Robert
R
Schmidt
Rudolf
R
Bratschitsch
Carsten
C
Fallnich
Klaus-J
KJ
Boller