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Coherent two-octave-spanning supercontinuum generation in lithium-niobate waveguides
Optics Letters
|March 2, 2019
Summary
We demonstrate broadband supercontinuum generation in a lithium-niobate waveguide, enabling direct detection of the carrier-envelope offset frequency (fCEO) with high signal-to-noise ratio.
Area of Science:
- Photonics and Optical Engineering
- Nonlinear Optics
- Integrated Photonics
Background:
- Supercontinuum generation (SCG) is crucial for various photonic applications.
- Integrated photonics offers miniaturization and enhanced control over nonlinear optical processes.
- Lithium niobate is a key material for nonlinear optical devices due to its strong nonlinear coefficients.
Purpose of the Study:
- To demonstrate coherent supercontinuum generation in a monolithically integrated lithium-niobate waveguide.
- To achieve broadband SCG covering more than two octaves of optical bandwidth.
- To enable direct detection of the carrier-envelope offset frequency (fCEO) within a single integrated device.
Main Methods:
- Utilizing a monolithically integrated lithium-niobate waveguide.
- Employing femtosecond laser pulses with 100-picojoule energy.
- Engineering waveguide dispersion to achieve spectral overlap between SCG and second harmonic generation.
- Leveraging second- and third-order nonlinear effects for SCG.
Main Results:
- Achieved coherent supercontinuum generation spanning over two optical octaves.
- Demonstrated SCG in a compact 0.5-cm-long lithium-niobate waveguide.
- Successfully enabled direct detection of the carrier-envelope offset frequency (fCEO).
- Measured the fCEO of the femtosecond pump source with a 30-dB signal-to-noise ratio.
Conclusions:
- Monolithically integrated lithium-niobate waveguides are effective platforms for broadband supercontinuum generation.
- Dispersion engineering in these waveguides facilitates direct fCEO detection.
- This integrated approach offers a compact and efficient method for characterizing femtosecond laser sources.
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