cavcalc.functions.resonance.Aext_of_R1R2

cavcalc.functions.resonance.Aext_of_R1R2(R1, R2)

The external resonance enhancement factor of a cavity where the first mirror has (power) reflectivity \(R_1\) and the second mirror has reflectivity \(R_2\).

\[A'_{\mathrm{circ}} = \frac{1 - R_1}{(1 - \sqrt{R_1 R_2})^2}\]