Faraday Rotator Glass

Faraday rotator glass is a kind of magneto-optical glasses with good transmittance in the visible and infrared range(520~1400nm). Faraday rotator glass is more suitable for medium and low power level lasers, and is cheaper compared with the other magneto-optic crystals such as TGG,TSAG. TG20 has been used widely in switch, modulator, sensor, magneto-optical isolator.

Parameter

Diameter Tolerance< λ/8 @ 633nm
Length Tolerance±0.05mm
Flatness<λ/8 @ 633nm
Surface Quality10/5 scratch/dig
Parallelism< 5 seconds
Clear Aperture>90%
Edge Chamfer0.1mm x 45°
MaterialsTG20TG28
Thermal Coefficient of Refractive Index (10-7 /℃)74
Thermal Coefficient of Optical Path (10-7 /℃)105
Transmission Window (nm)520-1400520-1400
Coefficient of Thermal Expansion (10-7 /℃)51.369
Transition Temperature (℃)760759
Sag Temperature (℃)800800
Density (g/cm 3 )4.324.99
Young’s Modulus GPa)108 
Poisson’s Ratio0.22 
Knoop Hardness (Kg/cm2 )760 
MaterialsTG20TG28
Refractive Index (1064nm)1.67211.736
Refractive Index (d 589.3nm)1.68881.75
Nonlinear Refractive Index (10-13 e.s.u .)2.462.42
Abbe Number53.1450.98
MaterialsTG20TG28
Verdet Constant V (min/Oe.cm): 632.8nm-0.258-0.361
Verdet Constant V (min/Oe.cm): 1064nm-0.075-0.106

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