Finesse Value of Cavity Calculator

Finesse Value of Cavity Calculator

Calculate the finesse \(F\) of a Fabry–Pérot cavity using the formula:
\( F = \frac{\pi\sqrt{R}}{1-R} \)
where \(R\) is the mirror reflectivity (0 < \(R\) < 1).

* Enter the mirror reflectivity as a decimal (e.g., 0.99).

Step 1: Enter Mirror Reflectivity

Enter a value between 0 and 1 (e.g., 0.99).

Derived Formula: \( F = \frac{\pi\sqrt{R}}{1-R} \)


Practical Example:
For \( R = 0.99 \), \( F \approx \frac{\pi\sqrt{0.99}}{1-0.99} \approx 312.0 \).