Terbium Gallium Garnet
TGG

Crystal properties

Growth Method

Czocralski 

Chemical Formula

Tb3Ga5O12 

Lattice Parameter

A = 12.355Å 

Density

7.13 g/cm3 

Mohs Hardness

8.0 

Melting Point

1725 o

Refractive Index

1.954 

at 1064 nm

Thermal Conductivity 

9.4x10-6oC-1

Verdet Constant 

0.12min / Oe.cm  at 1064nm

Crystal rod  parameters

Orientation

[111] within 5 degrees

Wave front Distortion (Measured at 633 nm)

< 1/8 wave total

Extinction Ratio

> 30 dB

Dimensional  Tolerances

Diameter

+0.00 mm / -0.05 mm

Length

+0.2 mm / -0.2 mm

Chamfer

 0.13mm (+0.00 mm, -0.08 mm)   at 45º +/- 5º

End Configuration

Flatness

< 1 / 10 wave at 633 nm

Parallelism

< 1 minutes of arc

Perpendicularity

< 1 degree

Scratch-dig

10-5 per MIL-O13830A