Distributed Bragg Reflector Bandgap Calculator
Nanophotonics & laser mirror design: Compute quarter-wave optical layer thicknesses ($d_1, d_2$), stopband spectral width ($\Delta\lambda$), maximum power reflectance ($R_{max}$), and optical penetration depth ($L_{pen}$).
DBR Materials & Center Wavelength
e.g. Nd:YAG (1064 nm) or Telecom (1550 nm)
e.g. TiO2 = 2.35, GaAs = 3.55
e.g. SiO2 = 1.45, AlAs = 2.95
Air = 1.00
Fused silica = 1.45, Glass = 1.52
Spectral Stopband & Optical Reflectivity
Peak Reflectance R_max:
--
%
High-Index Thickness d_H:
--
nm (λ₀ / 4n_H)
Low-Index Thickness d_L:
--
nm (λ₀ / 4n_L)
Stopband Width Δλ:
--
nm (photonic gap)
Fractional Gap:
--
Δω / ω₀
Penetration Depth:
--
nm (L_pen)
Laser Cavity Optical Performance
Refractive Index Contrast (n_H / n_L):
--
Residual Transmittance T = 1 - R:
-- ppm
Mirror Grade:
--
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