Ultrabroadband nonlinear optics in nanophotonic periodically poled lithium niobate waveguides

• DOI: 10.1364/optica.7.000040
• Publication Date: 2020-01-06T15:20:56Z
• Authors: Marc Jankowski; Carsten Langrock; Boris Desiatov; Alireza Marandi; Cheng Wang; Mian Zhang; Christopher R. Ph...; Marko Lončar; M. M. Fejer
• Keywords: Nanophotonics

Quasi-phase-matched interactions in waveguides with quadratic nonlinearities enable highly efficient nonlinear frequency conversion. In this paper, we demonstrate the first generation of devices that combine dispersion engineering available nanophotonic quasi-phase-matched periodically poled lithium niobate (PPLN). This combination enables quasi-static femtosecond pulses, reducing pulse energy requirements by several orders magnitude compared to conventional devices, from picojoules femtojoules. We experimentally two effects associated second harmonic (SHG). First, observe SHG <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>&lt;</mml:mo> </mml:mrow> <mml:mn>100</mml:mn> <mml:mspace width="thickmathspace"/> <mml:mi mathvariant="normal">f</mml:mi> mathvariant="normal">J</mml:mi> </mml:math> energy. Second, limit strong phase-mismatch, spectral broadening both harmonics as little 2 pJ These results lay a foundation for new class which coengineering quasi-phase-matching optics at femtojoule level.