Optimization of a fiber Fabry-Perot resonator for low-threshold modulation instability Kerr frequency combs.

Area of Science:

• Nonlinear optics
• Quantum optics
• Optical cavity physics

Background:

• Kerr frequency combs are crucial for spectroscopy and optical communications.
• Fiber Fabry-Perot cavities offer enhanced light-matter interaction.
• Modulation instability (MI) is a key mechanism for Kerr frequency comb generation.

Purpose of the Study:

• To theoretically and experimentally investigate fiber Fabry-Perot cavities for enhanced Kerr frequency comb generation.
• To predict optimal cavity parameters for MI Kerr frequency comb generation.
• To understand the relationship between cavity properties and MI dynamics.

Main Methods:

• Linear stability analysis of a generalized Lugiato-Lefever equation to derive the MI power threshold.
• Incorporation of power enhancement factor (PEF) and optimal coupling concepts.
• Experimental verification by measuring MI power threshold across different detunings and cavities.

Main Results:

• A theoretical framework predicting ideal manufacturing parameters for MI Kerr frequency comb generation in FFP cavities.
• Demonstration of a distinction between optimal coupling for MI and cold cavity resonance.
• Experimental validation of theoretical predictions for MI power threshold as a function of detuning.

Conclusions:

• Mirror reflectivity in FFP cavities needs specific adjustment for MI Kerr frequency comb generation, differing from cold cavity optimal coupling.
• The study provides guidelines for designing FFP cavities tailored for efficient Kerr frequency comb generation.
• Theoretical predictions are experimentally verified, confirming the importance of cavity parameter optimization.