An air-spaced Fabry-Perot etalon has mirror spacing mm and each mirror has reflectance

PHYSICS · Multi-part · Fermi University Physics · Optics & Photonics · Interference and diffraction · Interference and diffraction

Optics and Photonics, Ch Multiple-beam interference: thin films, multilayers and the Fabry-Perot etalon

Problem

An air-spaced Fabry-Perot etalon has mirror spacing

d = 4.00

mm and each mirror has reflectance

\mathcal{R} = 0.95

. The air between the mirrors has

n = 1.00

. ((a)) Compute the free spectral range

\Delta\nu_{\rm FSR}

. ((b)) Compute the finesse

\mathcal{F}