TGG (Terbium Gallium Garnet) Crystal
Keywords:
Scintillation Crystals
- Product Introduction
- Key advantages
- Application areas
- Product Features
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- Commodity name: TGG (Terbium Gallium Garnet) Crystal
TGG (Terbium Gallium Garnet) Crystal, with chemical formula Tb₃Ga₅O₁₂, is a high-performance magneto-optic crystal used across the visible and near-infrared spectra (400-470 nm and 500-1500 nm), finding extensive applications in laser technology, optical communications, and optical information-processing systems
Product Introduction
TGG (Terbium Gallium Garnet) Crystal, with chemical formula Tb₃Ga₅O₁₂, is a high-performance magneto-optic crystal used across the visible and near-infrared spectra (400-470 nm and 500-1500 nm), finding extensive applications in laser technology, optical communications, and optical information-processing systems.TGG boasts several advantageous properties in the visible and near-infrared regions, including a high Verdet constant, low transmission loss, exceptional thermal conductivity, and an impressive laser damage threshold. Additionally, it excels in the ability to grow large-sized crystals easily. As a result, TGG is currently considered the optimal magneto-optic material for fabricating Faraday rotators and isolators within this wavelength range (400~1100 nm), excluding the 470~500 nm region. These unique characteristics make TGG ideal for producing magneto-optic isolators, switches, and modulators, which are extensively employed in multi-stage amplifiers, ring lasers, and seed-injected lasers based on materials such as YAG and titanium-doped sapphire.
Key Advantages
- High magneto-optic constant (35 Rad T) -1 m -1 )
- Low light loss (<0.1% / cm)
- High thermal conductivity (4 W/m) -1 K -1 )
- High laser camage threshold (> 1 GW/cm²)
- Absorption coefficient (<0.1%/cm)Application Areas
- Ion irradiated magneto-optical waveguides
- Faraday rotators
- Fiber optic isolator
- Free-space isolator
- Magneto-optic switches and magneto-optic modulatorsProduct Features
Material Properties
Chemical Formula
Tb₃Ga₅O₁₂
Crystal Structure
Cubic
Growth Method
Czochralski Method
Density
7.13 g/cm³
Mohs Hardness
8 Mohs
Lattice Constant
a=12.355 Å
Transparency Range
400-1100 nm
Verdet Constant (rad/T/m)
40@1064nm
Refractive Index
1.954@1064 nm
Melting Point
1725°C
Product Processing Indicators
Orientation
[111] ±15′
Extinction Ratio
≥30 dB
Effective Aperture
>90%
Maximum Size
<∮100 mm
Diameter Tolerance
+0/-0.05 mm
Length Tolerance
±0.2 mm
Chamfer
≤0.2×45°
Surface Quality
10-5 S-D
Flatness
≤λ/8@632.8 nm
Wavefront Distortion
≤λ/8@632.8 nm
Parallelism
<20"
Perpendicularity
≤15′
Chipped Edge
<0.1 mm
Coating
AR:R<0.2%@1064 nm
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- High magneto-optic constant (35 Rad T⁻¹m⁻¹).
- Low light loss (<0.1% / cm)
- High thermal conductivity (4 W m⁻¹K⁻¹).
- High laser damage threshold (> 1 GW/cm²).
- Absorption coefficient (<0.1%/cm) -
- Ion-Irradiated Magneto-Optic Waveguide
- Faraday Rotator
- Fiber optic isolator
- Free-space isolator
- Magneto-optic switches and magneto-optic modulators -
Material Properties Molecular formula Tb3Ga5O12 Crystal structure Cubic crystal system Production method Tiraf Method Density 7.13g/cm3 Mohs Hardness 8Mohs Unit cell parameters a = 12.355 Å Transmittance range 400 nm to 1100 nm Wiedemann constant (rad/T/m) 40 at 1064nm Refractive index 1.954 @ 1064 nm Melting point 1725°C Product Processing Metrics Directional [111] ±15′
Extinction Ratio ≥30dB Effective Aperture >90% Maximum size <∮100mm Diameter Tolerance +0 / -0.05 mm Length Tolerance ±0.2 mm Protective Chamfer ≤0.2 × 45° Surface finish 10-5 S-D Flatness ≤λ/8 @ 632.8 nm Analyzing wavefront distortion ≤λ/8 @ 632.8 nm Parallelism <20" Verticality ≤15′ Chipped edge <0.1 mm Coating AR:R < 0.2% @ 1064 nm
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