title: Gigahertz frequency comb offset stabilization based on supercontinuum generation in silicon nitride waveguides.
abstract: Silicon nitride (Si3N4) waveguides represent a novel photonic platform that is ideally suited for energy efficient and ultrabroadband nonlinear interactions from the visible to the mid-infrared. Chip-based supercontinuum generation in Si3N4offers a path towards a fully-integrated and highly compact comb source for sensing and time-and-frequency metrology applications. We demonstrate the first successful frequency comb offset stabilization that utilizes a Si3N4waveguide for octave-spanning supercontinuum generation and achieve the lowest integrated residual phase noise of any diode-pumped gigahertz laser comb to date. In addition, we perform a direct comparison to a standard silica photonic crystal fiber (PCF) using the same ultrafast solid-state laser oscillator operating at 1 µm. We identify the minimal role of Raman scattering in Si3N4as a key benefit that allows to overcome the fundamental limitations of silica fibers set by Raman-induced self-frequency shift.
authors.forename: Alexander
authors.initials: A
authors.lastname: Klenner
authors.forename: Aline S
authors.initials: AS
authors.lastname: Mayer
authors.forename: Adrea R
authors.initials: AR
authors.lastname: Johnson
authors.forename: Kevin
authors.initials: K
authors.lastname: Luke
authors.forename: Michael R E
authors.initials: MR
authors.lastname: Lamont
authors.forename: Yoshitomo
authors.initials: Y
authors.lastname: Okawachi
authors.forename: Michal
authors.initials: M
authors.lastname: Lipson
authors.forename: Alexander L
authors.initials: AL
authors.lastname: Gaeta
authors.forename: Ursula
authors.initials: U
authors.lastname: Keller