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  • TGG

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

     •   Large Verdet constant (35 Rad T-1 m-1)
      •  Low optical losses (<0.1%/cm)
      •  High thermal conductivity (7.4W m-1 K-1).
      •  High laser damage threshold (>1GW/cm2)

 

Main Properties:

Chemical Formula

Tb3Ga5O12

Lattice Parameter

a=12.355Å

Growth Method         

Czochralski

Density

7.13g/cm3

Mohs Hardness

8.0

Melting Point

1725℃

Refractive Index

1.954 at 1064nm             

 

CASTECH supply TGG crystal with:

Orientation

[111],±15′

Wavefront Distortion

<λ/8

Extinction Ratio

>30dB

Diameter Tolerance         

+0.00mm/-0.05mm               

Length Tolerance

+0.2mm/-0.2mm

Chamfer

0.10mm @ 45°

Flatness

<λ/10 at 633nm

Parallelism

<30″

Perpendicularity

<5′

Surface Quality

10/5

AR coating

<0.2%

 

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  • Magneto-Optical Crystals_Terbium Gallium Garnet (TGG) Crystal.pdf