// multi-utility computation suite · offline · instant · precise
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sci.optical-Fabry-Perot-FSR Calculator
Calculates Fabry-Pérot etalon free spectral range FSR = c/(2nL), finesse F = π√R/(1−R), and transmission peak positions. At R = 0.99, finesse = 312 — this means the transmission peak FWHM is 1/312 of the FSR, enabling 0.003 pm wavelength resolution at 1,550 nm with a 10 mm cavity.
Inputs
L Mm
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
N Medium
Reference formula or conversion factor shown for context.
R Mirror
Reference formula or conversion factor shown for context.
Results
free spectral range FSR (GHz)
The difference between the maximum and minimum values.
cavity finesse F
Sample size or count used in the calculation.
resonance linewidth δν (MHz)
The computed width.
FSR = c / (2nL)
Sample size or count used in the calculation.
F = π√R / (1−R)
Reference formula or conversion factor shown for context.
Q-factor estimate
A dimensionless multiplier applied in the calculation.