Fabry-Pérot Etalon

Cavity spacing d: 5.00 μm Reflectivity R: 0.85 Refractive index n: 1.00 Tilt angle θ: 0.0°

Center λ: 550 nm

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Finesse ℱ

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FSR (nm)

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FWHM (nm)

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Transmission

T(δ) = 1 / (1 + F·sin²(δ/2))

F = 4R / (1−R)²

δ = 4πnd·cosθ / λ

FSR = λ² / (2nd·cosθ)

ℱ = π√R / (1−R)

FWHM = FSR / ℱ