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🔬 Thin-Film Optical Coating Calculator
Calculate thin-film thickness, reflectivity, and interference effects
📐 Thin-Film Formulas
Optical Path Length = n × d
Phase Shift = (2π × n × d) / λ
Constructive Interference: 2nd = mλ
Destructive Interference: 2nd = (m + ½)λ
n = refractive index, d = thickness, λ = wavelength, m = order
Film Thickness:
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Optical Path Length:
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Phase Shift:
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Reflectivity:
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💡 Tips & Information
- Quarter-wave coatings (λ/4) provide maximum reflectivity
- Half-wave coatings (λ/2) act as if no film is present
- Multi-layer coatings can achieve >99% reflectivity
- Consider absorption losses in real materials
- Temperature affects refractive indices and thickness