Gigahertz frequency comb offset stabilization based on supercontinuum generation in silicon nitride waveguides

Publication Type:

Journal Article


Opt. Express, OSA, Volume 24, Number 10, p.11043–11053 (2016)



Raman effect, Supercontinuum generation, Ultrafast lasers, Ultrafast optics, Waveguides


<p>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 Si3N4 offers 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 Si3N4 waveguide 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 &amp;\#x00B5;m. We identify the minimal role of Raman scattering in Si3N4 as a key benefit that allows to overcome the fundamental limitations of silica fibers set by Raman-induced self-frequency shift.</p>

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