The free spectral range of a Fabry–Pérot interferometer (or a Lyot filter) often limits the optical frequency range in which it can be used as a spectrometer.Ī large free spectral range can thus be desirable.
![spectral resolution calculator spectral resolution calculator](https://uk.mathworks.com/help/examples/audio/win64/SpectralKurtosisOfTimeDomainAudioExample_01.png)
for an optical resonator containing different transparent media, the free spectral range is the inverse of the round-trip time (more precisely, the round-trip group delay) of a light pulse. After you have modified some inputs, click the "calc" button to recalculate the output.Īttention: The buttons do not work, as Javascript is turned off in your browser! Calculator for the Free Spectral Range Length:Įnter input values with units, where appropriate.
![spectral resolution calculator spectral resolution calculator](https://www.mathworks.com/help/examples/audio/win64/SpecifyNondefaultParametersFluxExample_01.png)
![spectral resolution calculator spectral resolution calculator](https://slidetodoc.com/presentation_image/488f5990351263974c9f7d846ed53a22/image-14.jpg)
#Spectral resolution calculator full
This follows from the fact that the round-trip phase shift 2 k L = 2 L n ω/ c must change by 2 π from one resonance to the next one, and only through the group index one considers the full frequency dependence of the round-trip phase shift (including the frequency dependence of the refractive index).ĭue to chromatic dispersion, the group index can substantially deviate from the refractive index, and it generally is frequency-dependent.įor a waveguide resonator, one would have to calculate the group index using the frequency-dependent effective refractive index.