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Ultra-flat electro-optic frequency comb based on a chirp-modulated lithium niobate resonator
Optics Express
|January 29, 2025
Summary
Chirp modulation in a lithium niobate resonator creates a highly flat electro-optic frequency comb (EO comb). This resonant approach expands bandwidth for enhanced sensing and spectroscopy applications.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
Background:
- Electro-optic frequency combs (EO combs) are valuable for high-precision sensing and spectroscopy.
- Conventional waveguide devices face limitations in modulation efficiency and bandwidth.
Purpose of the Study:
- To realize a high-flatness EO comb with small tooth spacing using chirp modulation resonance.
- To expand the comb bandwidth beyond conventional methods.
Main Methods:
- Utilized chirp modulation resonance in a lithium niobate resonator.
- Theoretically modulated the dispersion coupling term for phase chirp.
- Experimentally demonstrated comb generation with low repetition rate and bias voltage.
Main Results:
- Achieved a multistage flat comb with significantly expanded bandwidth.
- Demonstrated a comb bandwidth exceeding 150 MHz with over 2,000 flat comb teeth (3 dB).
- Measured a temperature sensitivity of 1505.00 MHz/K and instability of 1.13 mK/Hz1/2.
Conclusions:
- Resonant mode chirp modulation offers superior performance over waveguide-based EO combs.
- The developed EO comb shows great potential for high-precision temperature sensing applications.
