Fabry–Perot Resonator calculator
Free spectral range and finesse of an etalon.
Category: Spectroscopy
Formula: FSR = c/(2·n·L) · ℱ = π/(2·asin((1−R)/(2√R))) ≈ π√R/(1−R) · δν = FSR/ℱ
Inputs
| Input | Parameter | Unit | Default |
|---|---|---|---|
| Length L | L | mm | 10 |
| Index n | n | 1 | |
| Mirror R | R | 0.95 |
Result with the default inputs
- FSR: 14.9896 GHz
- Finesse: 61.2342
- Linewidth: 244.7917 MHz
Open it with your own values: put each input in the address as a parameter, for example /calculators/fabry-perot-resonator?L=10. A unit other than the listed one goes in <parameter>_unit.
Read more: Wikipedia: Fabry–Pérot interferometer