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Octave-spanning supercontinuum generation in nanoscale lithium niobate waveguides
Optics Letters
|March 16, 2019
Summary
We achieved octave-spanning supercontinuum generation in lithium niobate waveguides. This breakthrough enables a compact supercontinuum source for precision frequency metrology.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
Background:
- Supercontinuum generation is crucial for various applications, including optical metrology.
- Lithium niobate (LiNbO3) is a promising material for nonlinear optics due to its high nonlinear coefficients.
Purpose of the Study:
- To demonstrate octave-spanning supercontinuum generation in unpoled lithium niobate waveguides.
- To explore the tunability of dispersive waves and second-harmonic generation by controlling waveguide width.
- To provide a pathway towards integrated supercontinuum sources for precision measurements.
Main Methods:
- Fabrication of engineered lithium niobate waveguides with anomalous dispersion.
- Pumping waveguides with a turn-key femtosecond laser at 1560 nm.
- Numerical modeling using the generalized nonlinear Schrödinger equation (GNLSE).
Main Results:
- Successful generation of octave-spanning supercontinua in unpoled LiNbO3 waveguides.
- Observation of tunable dispersive waves and phase-matched second-harmonic generation.
- Experimental spectra accurately reproduced by GNLSE simulations.
Conclusions:
- Unpoled lithium niobate waveguides are suitable for broadband supercontinuum generation.
- Waveguide engineering allows for spectral tailoring and control of nonlinear processes.
- This work presents a viable route for developing simple, integrable supercontinuum sources on a nanophotonic platform, advancing precision frequency metrology.
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