An air-spaced ( ) etalon with mirror reflectance is used at nm
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 (n=1.00) etalon with mirror reflectance R=0.92 is used at λ=633 nm. Find the free spectral range, the finesse and the resolving power λ/Δλ for
((a)) a spacing d1=2.00 mm;
((b)) a spacing d2=4.00 mm (double the first);
((c)) State which of the three quantities changes when the spacing is doubled and which does not, and why.