Terbium gallium garnet factory
China Terbium gallium garnet company


TGG is an excellent magneto-optical crystal material, which is used in all kinds of Faraday isolators and rotators. The applicable wavelength is 400nm-1100nm (except 475-500nm).

Product Description

Terbium gallium garnet (TGG) is a kind of high performance magneto-optical crystal in the visible and near infrared spectrum, which is widely used in laser technology, optical communication and optical information processing technology. It has high feld constant, low optical absorption coefficient, high laser damage threshold and good optical properties. These excellent properties make TGG crystal an ideal material for magneto-optical isolator. Crystro could provide φ4 inch TGG boule.

Main Advantages:

Large Verdet Constant (40 Rad T-1 m-1)

Low optical loss (<0.1%/cm)

High thermal conductivity (7.4W m-1K-1).

High laser damage threshold (>1GW/cm2).

Typical application:

Faraday rotator

Optical isolator

Material Properties

Chemical FormulaTb3Ga5O12
Lattice Constanta=12.355Å
Growth MethodCzochralski
Melting Point1725 ℃
Refractive Index1.954 @ 1064nm

Technical Parameter

Crystro offers:

Orientation[111] ±15′
Wave Front Distortion<λ/8
Extinction Ratio>35dB
Diameter Tolerance+0.00mm/-0.05mm
Length Tolerance+0.2mm/-0.2mm
Flatness<λ/10 @ 633nm
Parallelism< 30"
Perpendicularity< 5'
Surface Quality(S/D)10-5
CoatingAR, R<0.2%
DimensionsMax Φ101.6 mm (4’inch)
Note: Above parameters for reference only, please contact our sales Rep. for your specific requirement.


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