Magneto-Optic Design Calculator
Calculate Faraday rotation, required crystal length, isolator performance, and estimate Verdet constants at different wavelengths.
The Faraday effect rotates the polarization plane of light passing through a magnetized medium by θ = V × B × L, where V is the material's Verdet constant, B is the applied field, and L is the crystal length. This rotation is non-reciprocal — it does not reverse on back-propagation — which is the basis of optical isolators and circulators. This calculator covers four design tasks using tabulated Verdet constants for TGG, TSAG, fused silica, BK7, SF-6, and SF-57 at 532, 632.8, and 1064 nm. Faraday Rotation computes θ for a given V, B, and L. Crystal Design finds the required crystal length to achieve a target rotation angle (45° for a standard isolator) at a specified field. Isolator Performance reports isolation in dB and insertion loss from the actual rotation angle and polarizer extinction ratio. Verdet Dispersion estimates V at a new wavelength using the λ⁻² scaling approximation.