Coherence Length Calculator

Calculate coherence length and coherence time from source linewidth or wavelength bandwidth.

Input
Coherence Properties
Coherence length
L_c = c / Δν
19.99cm
Coherence time
τ_c = 1 / Δν
666.7ps
Equivalent Linewidth
Frequency linewidth
1.500GHz
Wavelength bandwidth
at λ₀ = 632.8 nm
2.004pm
Abridged Optics — Coherence Length Calculator v1.0L_c = c/Δν · τ_c = 1/Δν · c = 299 792 458 m/s (exact)

All information, equations, and calculations have been compiled and verified to the best of our ability. For mission-critical applications, we recommend independent verification of all values. If you find an error, please let us know.