Ultrabroadband Nonlinear Optics in Nanophotonic Periodically Poled Lithium Niobate Waveguides
Abstract
Quasi-phasematched interactions in waveguides with quadratic nonlinearities enable highly efficient nonlinear frequency conversion. In this article, we demonstrate the first generation of devices that combine the dispersion-engineering available in nanophotonic waveguides with quasi-phasematched nonlinear interactions available in periodically poled lithium niobite (PPLN). This combination enables quasi-static interactions of femtosecond pulses, reducing the pulse energy requirements by several orders of magnitude, from picojoules to femtojoules. We experimentally demonstrate two effects associated with second harmonic generation. First, we observe efficient quasi-phasematched second harmonic generation with <100 fJ of pulse energy. Second, in the limit of strong phase-mismatch, we observe spectral broadening of both harmonics with as little as 2-pJ of pulse energy. These results lay a foundation for a new class of nonlinear devices, in which co-engineering of dispersion with quasi-phasematching enables efficient nonlinear optics at the femtojoule level.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 19, 2019
- Accession Number
- AD1105112
Entities
People
- Alireza Marandi
- Boris Desiatov
- C. R. Phillips
- Carsten Langrock
- Cheng Wang
- M. M. Fejer
- Marc Jankowski
- Marko Loncar
- Mian Zhang
Organizations
- California Institute of Technology
- City University of Hong Kong
- Harvard University
- Stanford University