TGG Crystal
Terbium gallium garnet (Tb3Ga5O12, TGG) is a crucial category of magneto-optical materials for use in the visible and the near-infrared spectral regions((400-470nm and 500-1500nm)). The TGG crystal possesses a large Verdet constant (35 RadT−1m−1 at 1064 nm), high thermal conductivity (7.4 Wm−1K−1), low optical losses (< 0.1%/cm) and high laser damage threshold (> 1 GW/cm2). Therefore, it is an attractive Faraday-rotating crystal suitable for constructing magneto-optical isolators, magneto-optical switches, magneto-optical modulators and so on，widely used in YAG, Ti-doped sapphire and other multi-stage amplification, ring type, seed injection laser
Parameter
| Chemical Formula | Tb3Ga5O12 |
| Lattice Parameter | a=12.355Å |
| Growth Method | Czocralski |
| Density | 7.13g/cm3 |
| Mohs Hardness | 8 |
| Melting Point | 1725 ℃ |
| Refractive Index | 1.954 at 1064nm |
| Crystal Structure | [111] |
| Extinction Ratio (over 2/3 clear aperture) | 30 dB |
| Thermal Conductivity: | 7.4 W cm-1 K-1 |
| Refractive Index: | 1.95 |
| Nonlinear Index, n2: | 8 |
| Figure of Merit, V/a: | 27 |
| Figure of Merit, V/n2: | 5 |
| Verdet Constant (632 nm) | -134 RadT-1m-1 |
| Verdet Constant (1064 nm) | -40 RadT-1m-1 |
TGG crystal case (1) for Faraday rotator and isolator
Size: φ13×4 mm / 10×10×10 mm;
Orientation: 111;
Clear Aperture >90%
TGG crystal case (2)
Size: φ10×1 mm;
Orientation: [111]
TGG crystal case (3)
Size: Ø3.2×25 mm;
Antireflection coating: 1064 nm both sides
TGG crystal case (4)
Size: Ø2×5 mm, Ø2×10 mm;
2-side polishing on end face;
Uncoated
- Large Verdet Constant (35 Rad T-1m-1).
- Low optical losses (<0.1%/cm)
- High thermal conductivity (7.4W m-1K-1).
- High laser damage threshold (>1GW/cm2).
- TGG has twice the Verdet constant of a terbium-doped glass.
- Thermal conductivity is an order of magnitude greater than typical glass.
- Optical losses are lower for TGG than Tb-doped glasses.
magneto-optic waveguide
Famagneto-optic waveguide based on TGG crystal via 15 MeV C3+ ion irradiation. The ion irradiation process leads to the optical anisotropy in the as-irradiated TGG waveguide,which hinders the magneto-optical rotation in the waveguide. To remove the irradiation-induced optical anisotropy, we annealed the as-irradiated TGG waveguide under different conditions. After annealing at 400°C for one hour, the magneto-opticalrotation of 14° per centimeter is observed in the waveguide at the wavelength of 632.8nm, under the magnetic field of 0.24T, which is comparable to that observed in the TGG crystal under the same magnetic field.
【Ref】Ion irradiated magneto-optic waveguide based on TGG crystal
| Growth of terbium gallium garnet (TGG) magneto-optic crystals by edge-defined film-fed growth method |
| High magneto-optical characteristics of Holmium-doped terbium gallium garnet crystal |
| Complete Stokes polarimetry of magneto-optical Faraday effect in a terbium gallium garnet crystal at cryogenic temperatures |
| Large-aperture Faraday isolator based on a terbium gallium garnet crystal |
| Room-temperature inverse Faraday effect in terbium gallium garnet |
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| Growth and characterization of Tb3Ga5xAlxO12 single crystal |
| Investigation of the thermal lens effect of the TGG crystal in high-power frequency-doubled laser with single frequency operation |
| Fabrication and characterization of TGG crystals containing paramagnetic rare-earth ions |
| Use of scanning Hartmann sensor for measurement of thermal lensing in TGG crystal |
| Temperature dependence of thermo-optic effects of single-crystal and ceramic TGG |
| Effect of terbium gallium garnet crystal orientation on the isolation ratio of a Faraday isolator at high average power |
| Highly transparent terbium gallium garnet crystal fabricated by the floating zone method for visible–infrared optical isolators |
| Growth of Tb3 Ga5 O12 fiber and bulk crystals using micro-pulling-down apparatus |
| Preparation and characterization of highly transparent Ce3+ doped terbium gallium garnet single crystal |
| Improving characteristic of Faraday effect based on the Tm3+ doped terbium gallium garnet single crystal |
| Study of the properties and prospects of Ce:TAG and TGG magnetooptical ceramics for optical isolators for lasers with high average power |
| Thermal lensing analysis of TGG and its effect on beam quality |
| Fabrication and characterizations of a Erbium doped terbium gallium garnet crystal for Faraday rotators |
| Low-temperature time-domain terahertz spectroscopy of terbium gallium garnet crystals |
| High power single-frequency and frequency doubled laser with active compensation for the thermal lens effect of terbium gallium garnet crystal |
| Photon self-induced spin-to-orbital conversion in a terbium-gallium-garnet crystal at high laser power |
| Influence of the Orientation of a Crystal on Thermal Polarization Effects in High-Power Solid-State Lasers |
| Wavelength dependence of Verdet constant of Pr doped terbium gallium garnet crystal |
| Investigation of the Variations in the Crystallization Front Shape during Growth of Gadolinium Gallium and Terbium Gallium Crystals by the Czochralski Method |
| Terbium Gallium garnet for Faraday Effect Devices |
| Magneto-elastic properties of Tb3Ga5O12 (TGG) |
| Magneto-optical property of terbium-lutetium-aluminum garnet crystals |
| Fabrication and characterization of cerium-doped terbium gallium garnet with high magneto-optical properties |
| Magneto-optical switching in microcavities based on a TGG defect sandwiched between periodic and disordered one-dimensional photonic structures |
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