Fabry-Perot cavity finesse F = pi sqrt(R)/(1 - R); rational canonical form

Layer 1 — Physicsin the photonics subtree

Fabry-Perot cavity-finesse framework (Fabry-Perot 1899 Annales de Chimie et de Physique). Setup: a Fabry-Perot interferometer is two parallel partially-reflecting mirrors with reflectance R and round-trip phase delta = 2 k n L cos theta.…