Magneto-optical crystal

/TGG crystal Terbium Gallium Garnet

TGG crystal Terbium Gallium Garnet

TGG is an excellent magneto-optical crystal used in various Faraday devices(Polarizer and Isolator) in the range of 400nm-1100nm, excluding 475-500nm.

  • Product Origin:

  • Shipping Port:

    Fuzhou, China
  • Lead Time:

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  • Product Detail


TGG crystal Terbium Gallium Garnet is an essential magneto-optical crystal l for faraday polarizer. Faraday polarizer is composed of the TGG crystal rod and a specially designed magnet. The polarization of the beam through the magneto-optical materials deflexed and direction of the deflection only has some relations with the direction of the magnetic field and has nothing to do with the direction of the beam propagation. An optical isolator is an optical component which allows the transmission of polarized light in only one direction.

Main application:

1) Faraday Isolators

2) Faraday Polarizer


3) Large Verdet constant (35 Rad T-1 m-1)

4) Low optical losses (<0.1%/cm)

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

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

Basic properties of TGG crystal:

Chemical Formula:


Lattice Parameter


Growth Method




Mohs Hardness


Melting Point


Refractive Index

1.954 at 1064nm

HGO offers TGG specifications:


<111> crystalline direction

Wavefront Distortion:

λ/10 per inch @ 632.8 nm

Dimension Tolerances

rods with diameter: +0.0/-0.05 mm , Length: ±0.1 mm

Extinction Ratio


Surface Quality:

10/5 Scratch/Dig MIL-O-1380A


< 10


< 5

Clear Aperture:

> 90%

Surface Flatness:

< λ/10 @ 632.8 nm


< 0.1 mm @ 45o


Upon customer request


AR coating upon customer’s request

Damage Threshold

750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz

Quality Warranty Period

One year under proper use

Why Choose HGO ?

HG OPTRONICS.,INC. has the ability to supply high quality Terbium Gallium Garnet TGG Crystal in mass production quantity. TGG crystal is an essential parts of isolators so strict quality control is applied to our TGG’s inclusions, absorption, scattering loss, bulk loss, bulk stress and most importantly ER value. All the necessary and essential specs can be physically measured in house.

In the past few years, the quantity of TGG crystals increasing largely and we have become key supplier of top isolator manufactures in world and HGO has a mass-production line for TGG crystals and have wide experiences and strong ability to supply such crystals with large quantity and in short delivery time.

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