Faraday Rotaor Glass

Faraday Rotator Glass/ Magneto Optical Glass/ Faraday Rotator Glass Elements It is the terbium doped borosilicate glass and key component of Faraday Rotators and Optical Isolators for visible and near-IR spectral range in fiber-optic communication system.

The polarized laser light will be rotated a certain angle in the magnetic field while going through the Faraday Rotator Glass to prevent the damage caused by the reflective laser light. The amount of polarization rotation is at θ=VHL θ is the polarization rotation angle.

V is the Verdet Constant of Faraday Rotator Glass H is the axial strength of magnetic field L is the path length of optical beam in the medium It is a new important transparent optical glass material in high-tech area. It can be used to produce Optical Isolators, circulators, magneto-optical modulators, optical switches, new generation current sensors etc.

Above devices have the characteristics of advance technology, stable performance, high sensitivity, high anti-interference, high insulation etc, furthermore, the size is bigger, but the cost is much lower compared with crystal materials TGG or YIG.

Paramagnetic Faraday Rotator Glass MOE-1: Verdet Constant: -0.33 min/Oe*cm or -96 rad/T*m at 632.8 nm Verdet Constant: -0.11 min/Oe*cm or -31.4 rad/T*m at 1064 nm

Transmission window:400nm-1600nm Transparence rate ≥ 85% (Uncoated)

Index of Refraction nD( at 589.3 nm) =1.7551 Optical Quality(△n) /cm < 2x10*-6

Abbe number: vD: 53.4

Non-linear refractive index n2 (x10*-13 e.s.u.)=2.55

Density (g/cm*3):4.97

Transformation temperature Tg: 788℃

Sag temperature Ts: 825℃

Coefficient of linear thermal expansion: 63.2×10*-7/℃

Absorption coefficients < 0.001/cm at 632.8nm and 1064nm.

Bulk laser damage threshold > 10 (J/cm*2) 3 ns pulse width at 1064 nm

Chemical properties: excellent Available in very large rods/ plates / disks Flatness of two faces: λ /4 wavelength at 632.8nm

Surface quality of two faces: 20-10 scratch/dig (MIL-0-13830A)

Diamagnetic Faraday Rotator Glass MOE-2: Diamagnetic materials generally offer lower Verdet constant, hence lower measurement resolution, but they have better environmental stability, particularly temperature stability comparing to paramagnetic Faraday Rotator elements.

For that reason, diamagnetic materials, especially diamagnetic glasses in bulk and fiber for, are commonly chosen as the sensing element in high stability Faraday effect sensor(Williams et al., 1991) Verdet Constant: 0.073 min/Oe-cm Refractive index Nd: 1.91075