Faraday rotator glass
Description:
Faraday rotator glass has been used in manufacturing of faraday rotational components based on Faraday character of the polarization plane, such as optical isolator, circulator, magneto-optical modulator, fast optical switches, interleavers, laser gyroscopes, goniometric devices, magneto-optic storage and optical information process system, current measuring transducers by magnetic field measuring and high-voltage transmission line, new generation current sensors, wave guides, free space light control, satellite survey and other functional devices.
Core Optronics can offer two kinds of faraday rotator glasses:
TG20 is a high Verdet constant glass in common uses.
TGP20 is characterized by a high Verdet constant and a lower nonlinear refractive index n2to avoid self-focusing in high power laser system.
Properties:
| TG20 | TG28 | |
| Verdet constant V(min/Oe.cm): 633nm | -0.258 | -0.361 |
| Verdet constant V(min/Oe.cm): 1064nm | -0.075 | -0.106 |
| Refractive lndex nd | 1.6888 | 1.75 |
| Abbe Number | 53.14 | 50.98 |
| Nonlinear refractive index(10-13e.s.u .) | 2.46 | 2.42 |
| Thermal coefficient of refractive index(10-7/℃) | 74 | - |
| Thermal coefficient of optical path(10-7/℃) | 105 | - |
| Transmission window(nm) | 520-1400 | 520-1400 |
| Coefficient of thermal expansion(10-7/℃) | 51.3 | 69 |
| Transition temperature(℃) | 760 | 759 |
| Sag temperature(℃) | 800 | 800 |
| Density(g/cm3) | 4.32 | 4.99 |
| Young's modulus GPa | 108 | - |
| Poisson's ratio | 0.22 | - |
| Knoop hardness(Kgf/cm2) | 760 | - |
| Chemical durability | Excellent | Excellent |
Specifications:
| Diameter Tolerance | < λ/8 @ 633nm |
| Length Tolerance | ±0.05mm |
| Flatness | <λ/8 @ 633nm |
| Surface quality | 10/5 scratch/dig |
| Parallelism | < 5 seconds |
| Clear Aperture | >90% |
| Edge chamfer | 0.1mm x 45° |