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.

 

Verdet Constant: -0.313 min/Oe*cm or -91 rad/T*m at 632.8 nm
Verdet Constant: -0.096 min/Oe*cm or -29 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)