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TGG - Terbium Gallium Garnet
- TGG is an excellent magneto-optical crystal used in various Faraday devices (Rotator and Isolator) in the range of 400nm-1100nm, excluding 475-500nm.
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Introduction
Terbium Gallium Garnet (Tb3Ga5O12, TGG) is an excellent magneto-optical crystal used in various Faraday devices (Rotators and Isolators) in the range of 400 nm-1100 nm, excluding 475 nm-500 nm.
CASTECH's magneto-optical crystal TGG is featured by • Large Verdet constant (35 Rad T-1 m-1)
• High thermal conductivity (7.4 W m-1 K-1)
• High laser damage threshold (> 1 GW/cm2)
Table 1. Basic Properties
|
Chemical Formula |
Tb3Ga5O12 |
|
Lattice Parameter |
a = 12.355 Å |
|
Growth Method |
Czochralski |
|
Density |
7.13 g/cm3 |
|
Melting Point |
1725℃ |
|
Mohs Hardness |
8 Mohs |
|
Refractive Index |
1.954 @1064 nm |
Specifications of TGG crystal from CASTECH
Table 2. Specifications
|
Orientation |
[111] within ±15′ |
|
Extinction Ratio |
＞ 30 dB |
|
Diameter Tolerance |
± 0.1 mm |
|
Length tolerance |
± 0.2 mm |
|
Surface Quality (Scratch/Dig) |
10/5 to MIL-PRF-13830B |
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Flatness |
＜ λ/8 @633 nm |
|
Wavefront Distortion |
＜ λ/8 @633 nm |
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Parallelism |
20 arc sec |
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Perpendicularity |
≦ 15 arc min |
|
Chamfer |
≦ 0.2 mm × 45° |
|
AR coating |
< 0.2% at 1064 nm |
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Magneto-Optical Crystals_Terbium Gallium Garnet (TGG) Crystal.pdf
Size:2020-11-19 10:57:32
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