// multi-utility computation suite · offline · instant · precise
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sci.fabry-perot-finesse Calculator
Calculates the finesse, free spectral range, and transmission peaks of a Fabry-Pérot optical resonator from mirror reflectivity and cavity length. Finesse F = π√R/(1−R) — at R = 0.99, finesse = 312, meaning cavity linewidth is 312× narrower than the free spectral range.
Inputs
Reflectivity Pct
Reference formula or conversion factor shown for context.
Mirror Spacing Mm
Reference formula or conversion factor shown for context.
Wavelength Nm
Distance between successive wave crests. Related to frequency: λ = speed / frequency.
Results
finesse F
Sample size or count used in the calculation.
free spectral range FSR (GHz)
The difference between the maximum and minimum values.
cavity linewidth (MHz)
The computed width.
Q factor
A dimensionless multiplier applied in the calculation.
F = π√R/(1-R)
Reference formula or conversion factor shown for context.
reflectivity
Reference formula or conversion factor shown for context.