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TGG

(Terbium Gallium Garnet Crystal)

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

 

Advantages

· TGG has twice the Verdet constant of a terbium-doped glass.

· The thermal conductivity of crystalline TGG is an order of magnitude greater than a typical glass.

· Optical losses are lower for TGG than Tb-doped glasses.

· The combination of the above factors make TGG better suited to high average power applications. The principal limiting factor is thermally induced beam distortion. Beam distortion is less for TGG than Tb-doped glasses under the same power loading level.

 

Properties:

Formula

Tb3Ga5O12

Crystal Structure

[111]

Verdet Constant (632 nm)

-134 RadT-1m-1

Verdet Constant (1064 nm)

-40 RadT-1m-1

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

 

 

Specifications:

Orientation

[111] within ±15 arc min

Wave Front Distortion

< 1/8 wave

Extinction Ratio

> 30dB

Diameter

+0.00mm/-0.05mm

Length

+0.2mm/-0.2mm

Chamfer

0.1mm @ 45°

Flatness

< 1/10 wave at 633nm

Parallelism

<10 arc secs

Perpendicularity

< 5 arc min

Surface Quality

10/5 Scratch/Dig

AR coating

R<0.2%  AR @1064nm

Barrel Finish (10-6 inches)

55 ± 5

 

Attached following Extinction Ratio measurement reports: