TG20 Faraday Rotator Glass
Faraday rotator glass was developed for magneto-optical isolators, switches, modulators and sensors. The TG20 glass series can be customized with the maximum size of 300 mm in diameter. Large aperture disks of TG20 have been used worldwide as isolator material for high power laser facilities.
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Verdet Constant
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V @ 632.8 nm (min / Oe. cm): ​- 0.258
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V @ 632.8 nm (min / Oe. cm): ​- 0.075​
Optical Specifications
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Refractive index (1064 nm): 1.6721
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Refractive index (d 589.3 nm): 1.6888
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Nonlinear refractive index (10^-13 e.s.u.): 2.46
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Abbe value: 53.14​​
Thermal Specifications
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Thermal coefficient of refractive index (10^-7 / K): 74
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Thermal coefficient of optical path (10^-7 / K): 105
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Transmission window (nm): 520 - 1400
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Coeff. of thermal expansion (10^-7 / K): 51.3
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Transition temperature (ºC): 760
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Sag temperature (ºC): 800​​
Other Specifications
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Density (g / cm^3): 4.32​
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Young’s modulus (G Pa): 108
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Posson’s ratio: 0.22
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Knoop hardness (kg / cm^2): 760​​​