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Gigahertz frequency comb offset stabilization based on supercontinuum generation in silicon nitride waveguides.
Optics Express
|July 14, 2016
Summary
Silicon nitride waveguides enable compact, energy-efficient supercontinuum generation. This research achieves unprecedented frequency comb stabilization, outperforming silica fibers by minimizing Raman scattering for advanced metrology.
Area of Science:
- Photonics
- Materials Science
- Nonlinear Optics
Background:
- Silicon nitride (Si3N4) waveguides offer unique properties for nonlinear optics.
- Supercontinuum generation is crucial for compact frequency comb sources.
- Existing silica-based systems face limitations like Raman scattering.
Purpose of the Study:
- To demonstrate frequency comb offset stabilization using Si3N4 waveguides.
- To achieve octave-spanning supercontinuum generation in Si3N4.
- To compare the performance of Si3N4 with silica photonic crystal fibers.
Main Methods:
- Utilizing Si3N4 waveguides for supercontinuum generation.
- Implementing frequency comb offset stabilization techniques.
- Direct comparison with silica photonic crystal fiber (PCF) using a 1 µm ultrafast laser.
Main Results:
- Achieved the first frequency comb offset stabilization in a Si3N4 waveguide.
- Generated octave-spanning supercontinuum.
- Demonstrated the lowest integrated residual phase noise for a diode-pumped gigahertz laser comb.
- Identified minimal Raman scattering in Si3N4 as a key advantage.
Conclusions:
- Si3N4 waveguides are a promising platform for energy-efficient, ultrabroadband nonlinear optics.
- Si3N4 overcomes limitations of silica fibers, particularly Raman-induced self-frequency shift.
- This work paves the way for highly integrated and compact frequency comb sources for sensing and metrology.
