Magneto-optical Crystal

Terbium Gallium Garnet (TGG) Crystal

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Introduction:

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


Main Advantages:

• 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)


Main Properties:

Chemical Formula

TB3Ga5O12

Lattic Parameter

a=12.355Å

Growth Method

Czochralski

Density

7.13g/cm3

Mohs Hardness

8.0

Melting Point

1725℃

Refractive Index

1.954 at 1064nm


CRYSTRO supply TGG crystal with:


Orientation

[111] within ±15 arc min

Wave Front Distortion

<1/8 wave

Extinction Ratio

>35dB

Diameter Tolerance

+0.00mm/-0.05mm

Length Tolerance

+0.2mm/-0.2mm

Chamfer

0.10mm@45º

Flatness

<1/10 wave at 633nm

Parallelism

< 30 arc Seconds

Perpendicularity

< 5 arc min

Surface Quality

10/5 Scratch/Dig

AR Coating

<0.2%

Large Dimensions of Crystals

2.8--100 mm in diameter




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