The magneto-optical crystal TGG is an optimum material for Faraday devices
(Rotator and Isolator) in the range from 400nm-1100nm, excluding 470-500nm.The
Faraday rotator consists of a TGG rod contained inside a special designed magnet.
The rotation sense of the polarization of a light beam passing through the
rotator only depends on the direction of the magnetic field and not on the
direction of propagation of the light beam. The optical isolator is a Faraday
rotator set between two suitably aligned polarizers
which allows a light beam to pass through in one
direction only. TGG has a combination of excellent properties such as large Verdet constant, low light loss, high thermal conductance
and high light damage threshold which makes it a unique material for Faraday devices particularly suitable for YAG lasers and
Ti: sapphire tunable lasers, ring lasers and seed injected lasers.
Crystal Parameters:
|
Chemical Formula
|
Tb3Ga5O12
|
|
Lattice Parameter
|
a=12.355Å
|
|
Growth Method
|
Czocralski
|
|
Density
|
7.13g/cm3
|
|
Mohs Hardness
|
8.0
|
|
Melting Point
|
1725oC
|
|
Refractive Index
|
1.954 at 1064nm
|
|
Thermal Conductivity
|
9.4x10-6oC-1
|
|
Verdet Constant
|
0.12min/Oe.cm at 1064nm
|
Standard TGG rod
specification:
|
Crystal rod parameters:
|
|
Orientation
|
[111] within 5 degrees
|
|
Wave front Distortion(Measured at 633nm)
|
< 1/8 wave total
|
|
Extinction Ratio
|
> 30dB
|
|
Dimensional Tolerances:
|
|
Diameter
|
+0.00mm/-0.05mm
|
|
Length
|
+0.2mm/-0.2mm
|
|
Chamfer
|
0.13mm (+0.00mm,-0.08mm) at 45º +/- 5º
|
|
End Configuration:
|
|
Flatness
|
< 1/10 wave at 633nm
|
|
Parallelism
|
< 1 minutes of arc
|
|
Perpendicularity
|
< 1 degree
|
|
Scratch-dig
|
10-5 per MIL-O13830A
|
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