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TGG
Terbium Gallium Garnet (TGG) is the rightcrystal material for Farady devices(Rotator and Isolator). The Farady ratatoris made up of a TGG rod contained in a special designed magnet. Thepolarization of a light beam passing through the rotator makes rotation.Thedirection of rotation is only dependent on the direction of the magnetic fieldand not on the direction of propagation of the light beam.The optical isolatorconsists of a 45 degree rotator set between two suitably arrayed polarizerswhich allow a light beam to pass through in one direction only. With acombination of excellent properties, such as large verdet constant,low lightloss, high thermal conductance and high light damage threshold,TGG is theunique material for Farady devices. It is widely used for YAG lasers andTi:sapphire tunable lasers,ring
Lasers,etc.
Basic Properties:
|
Chemical formula |
Tb3Ga5O12 |
|
Lattice parameters |
a=12.355Å |
|
Growth method |
CZ |
|
Density |
7.13g/cm3 |
|
Mohs hardness |
8.0 |
|
Melting point°C |
1725°C |
|
Refractive index |
1.954 at 1064nm |
|
Thermal conductivity W/( °C*cm) |
7.4W cm-1K-1 |
|
Polarized light magnetic constant rotation |
0.12min/Oe.cm at 1064nm |
Specifications:
|
Orientation |
[111] within 5 degrees |
|
Wavefront Distortion (per inch of rod length) |
λ/8 lambda@633nm |
|
Extinction Ratio |
30 dB over 2/3 clear aperture |
|
Diameter tolerance |
+0.000" / -0.002" |
|
Length tolerance |
+0.010 / -0.010" |
|
Chamfer |
0.005" ± 0.003" @ 45°± 5° |
|
Flatness |
λ / 10 wave @ 633 nm |
|
Parallelism |
< 1 minutes of arc |
|
Perpendicularity |
< 10 minutes of arc |
|
Surface Quality |
10 - 5 scratch-dig per MIL-0-13830A |
|
Reflectivity |
< 0.25% at 1064 nm |
Note: Kinds of sizes, cut angle, coating are available upon request.
