Faraday Glass

Faraday Glass

Faraday rotating glass is a magneto-optical glass with good transmittance in the visible and infrared range (520-1400 nm). It can rotate the polarization plane of a beam of polarized light passing parallel to the magnetic field direction and is a glass functional material with a strong Faraday effect. Because of its “non-reciprocity,” it can rotate the polarization plane of both forward- and reverse-incident light of the same wavelength in the same direction by the same angle, regardless of the light beam propagation direction. This material is widely used to make Faraday rotators based on these properties. TG20 has been widely used in switches, modulators, sensors, and magneto-optical isolators.

Features of Faraday Rotating Glass:

  • Verdet constant high
  • Good chemical durability
  • Excellent transparency

Material Specifications

Diameter Tolerance< λ/8 @ 633nm
Length Tolerance ±0.05mm
Flatness
<λ/8 @ 633nm
Surface Finish
10/5 S/D
Parallelism
< 5‘’
Clear Aperture
>90%
Chamfer
0.1mm x 45°

Physical and Chemical Properties

MaterialTG20TG28
Refractive index thermal coefficient(10-7  /℃)74
Thermal coefficient of optical path(10-7 /℃)105
Transmission Window(nm)520-1400520-1400
Thermal Coefficient of Expansion(10-7 /℃)51.369
Transformation Temperature(℃)760759
Sag of temperature(℃)800800
Density(g / cm34.324.99
Young's Modulus (GPa)108
Poisson Ratio
0.22
Knoop Hardness(Kg/cm2 )760

Optical and Spectral Properties

MaterialTG20TG28
Refractive Index(1064nm)1.67211.736
Refractive Index(@589.3nm)1.68881.75
Nonlinear refractive index(10-13 e.s.u)2.462.42
Abbe Value53.1450.98

Spectrum

Faraday optically rotating glass transmittance -CRYLINK
Transmittance

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