Broadband quasi-phase-matching in dispersion-engineered all-optically poled silicon nitride waveguides
Abstract
Quasi-phase-matching (QPM) has become one of the most common approaches for increasing the efficiency of nonlinear three-wave mixing processes in integrated photonic circuits. Here, we provide a study of dispersion engineering of QPM second-harmonic (SH) generation in stoichiometric silicon nitride ( Si 3 N 4 ) waveguides. We apply waveguide design and lithographic control in combination with the all-optical poling technique to study the QPM properties and shape the waveguide dispersion for broadband spectral conversion efficiency inside Si 3 N 4 waveguides. By meeting the requirements for maximal bandwidth of the conversion efficiency spectrum, we demonstrate that group-velocity matching of the pump and SH is simultaneously satisfied, resulting in efficient SH generation from ultrashort optical pulses. The latter is employed for retrieving a carrier-envelope-offset frequency of a frequency comb by using an f − 2 f interferometric technique, where supercontinuum and SH of a femtosecond pulse are generated in Si 3 N 4 waveguides. Finally, we show that the waveguide dispersion determines the QPM wavelength variation magnitude and sign due to the thermo-optic effect.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 20, 2020
- Source ID
- 10.1364/prj.396489
Entities
People
- Boris Zabelich
- Camille-sophie Brès
- Edgars Nitiss
- Junqiu Liu
- Ozan Yakar
- Rui Ning Wang
- Tobias Kippenberg
Organizations
- Air Force Materiel Command
- Air Force Office of Scientific Research
- Defense Advanced Research Projects Agency
- European Research Council
- Swiss National Science Foundation
- United States Air Force