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Other Crystals
optical crystal
TGG
TGG (Terbium Gallium Garnet) single crystal is the best magneto-optical material for making Faraday rotators and isolators, and it is suitable for wavelengths ranging from 400 to 1100 nm (excluding 47..
Product description
TGG (Terbium Gallium Garnet) single crystal is the best magneto-optical material for making Faraday rotators and isolators, and it is suitable for wavelengths ranging from 400 to 1100 nm (excluding 470 nm - 500 nm). A Faraday rotator consists of a TGG crystal rod and a specially designed magnet. The polarization direction of the light beam passing through the magneto-optical material will be deflected under the action of the magnetic field, and the deflection direction is only related to the direction of the magnetic field, not to the propagation direction of the light beam. An optical isolator is composed of a rotator with a 45-degree deflection and a pair of appropriately placed polarizers. It allows the light beam to pass only in one direction and blocks the light beam propagating in the opposite direction.
TGG single crystal has a large magneto-optical constant, low optical loss, high thermal conductivity, and a high laser damage threshold. It is widely used in multi-stage amplification, ring-shaped, and seed injection lasers such as YAG and Ti-doped sapphire lasers.
Advantages
- Large magneto-optical constant (35 Rad T⁻¹m⁻¹)
- High thermal conductivity (7.4 W m⁻¹K⁻¹)
- High laser damage resistance threshold (>1 GW/cm²)
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Chemical Formula
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Tb₃Ga₅O₁₂
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Unit Cell Parameter
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a = 12.355 Å
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Growth Method
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Czochralski method
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Density
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7.13 g/cm³
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Melting Point
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1725 °C
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Mohs Hardness
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8 Mohs
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Refractive Index
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1.954 @ 1064 nm
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Orientation
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[111] ±15′
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Extinction Ratio
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≥30 dB
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Diameter Tolerance
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±0.1 mm
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Length Tolerance
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±0.2 mm
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Surface Finish
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10/5, referring to MIL-PRF-13830B standard
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Flatness
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≤λ/8 @ 633 nm
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Transmitted Wavefront Distortion
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≤λ/8 @ 633 nm
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Parallelism
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20″
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Perpendicularity
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≤15′
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Chamfer
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≤0.2 mm×45°
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Reflectivity of Anti-reflection Coating
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R＜0.2% @ 1064 nm
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