IUPAC - free spectral range (08607)

free spectral range symbol: $Δ \tilde{ν}$ , unit: $m^{- 1}$

https://doi.org/10.1351/goldbook.08607

For a Fabry-Perot or laser cavity, wavenumber interval between successive longitudinal cavity modes of vibration;

Δ \tilde{ν} = 1 / (2 n l)

, where

l

is the cavity spacing and

n

is the refractive index of the material in the cavity.

Note:
SI unit:

m^{- 1}

Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 747 [Terms] [Paper]

Citation: 'free spectral range' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08607 RIS BibTex EndNote

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Version 3.0.1 (7233 Terms)

free spectral range symbol: $Δ \tilde{ν}$ , unit: $m^{- 1}$

Alphabetical Index

Additional Indexes

Version 3.0.1 (7233 Terms)

free spectral range symbol: Δν~, unit: m−1

free spectral range symbol: $Δ \tilde{ν}$ , unit: $m^{- 1}$