# Finesse Value of Cavity Calculator

Free spectral range divided by the bandwidth of its resonances is called as the finesse of an optical resonator or cavity. Finesse value of cavity calculator calculates the finesse value based on cavity quality factor (Q). Finesse value using cavity calculator is a simple online calculator that helps to avoid vague manual calculations.

### Example:

Calculate the Finesse value using cavity quality factor with the free space wavelength of 20, cavity refractive index of 15, cavity width of 2 and quality factor of 10.

#### Solution:

Finesse value = ( 20 / 15 x 2) x 10

= 6.666666666666666