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Home / Interferometry / Fabry-Pérot Cavity Resonators: Finesse Factors and Free Spectral Range Calculations
Interferometry

Fabry-Pérot Cavity Resonators: Finesse Factors and Free Spectral Range Calculations

Multiple-beam interference between parallel high-reflectance mirrors for sub-gigahertz spectral resolution.

By Dr. Sophie Mercier, Quantum Optics Researcher October 03, 2026 • 9 min read
Fabry-Pérot Cavity Resonators: Finesse Factors and Free Spectral Range Calculations

Multiple-Beam Interference Resonance Peaks

Multiple reflections inside the optical cavity produce constructive interference transmission peaks defined by integer multiples of half-wavelengths.

Cavity Finesse as a Function of Mirror Reflectivity

Cavity finesse directly reflects mirror reflectivity; mirrors with R = 99.5% deliver finesse factors exceeding 600.

Free Spectral Range and Ambiguity Spacing

Free Spectral Range (FSR) determines the frequency spacing between adjacent resonant modes without overlapping ambiguities.

⚠️ Technical & Safety Verification

The empirical methods outlined in this study reflect verified photonic systems, laser kinematics & waveguide physics protocols and field measurements. Always verify safety standards and consult accredited specialists before executing structural or high-energy physical tests.

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