Coefficient of Finesse (F) Calculator

Calculate Your Optical Resonator Finesse

Enter the Free Spectral Range. (e.g., 100 for 100 MHz)
Please enter a valid FSR.
Enter the Full Width at Half Maximum. (e.g., 5 for 5 MHz)
Please enter a valid FWHM.

Quickly calculate the Coefficient of Finesse (F) for optical resonators and Fabry-Perot interferometers. Understand how free spectral range (FSR) and full width at half maximum (FWHM) influence resonator performance. Our easy-to-use tool provides instant results for physicists and engineers.

Formula:

F = FSR / FWHM

Where:

  • F = Coefficient of Finesse (dimensionless)
  • FSR = Free Spectral Range (in consistent units, e.g., MHz)
  • FWHM = Full Width at Half Maximum (in consistent units, e.g., MHz)

Note: FSR and FWHM must be in the same units for a valid calculation.

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