Descriptions:
TGG crystal Terbium
Gallium Garnet is an
essential magneto-optical crystal l for faraday polarizer. Faraday polarizer is composed of the
TGG crystal rod and a specially designed magnet. The polarization of the beam
through the magneto-optical materials deflexed and direction of the deflection
only has some relations with the direction of the magnetic field and has
nothing to do with the direction of the beam propagation. An optical isolator
is an optical component which allows the transmission of polarized light in
only one direction.
Main
application:
1)
Faraday Isolators
2)
Faraday Polarizer
Advantages:
3)
Large Verdet constant (35 Rad T-1 m-1)
4)
Low optical losses (<0.1%/cm)
5)
High thermal conductivity (7.4W m-1 K-1).
6)
High laser damage threshold (>1GW/cm2)
Basic
properties of TGG crystal:
|
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
|
HGO offers TGG specifications:
|
Orientation:
|
<111> crystalline direction
|
|
Wavefront Distortion:
|
λ/10 per inch @ 632.8 nm
|
|
Dimension Tolerances：
|
rods with diameter: +0.0/-0.05 mm , Length: ±0.1
mm
|
|
Extinction Ratio
|
>30dB
|
|
Surface Quality:
|
10/5 Scratch/Dig MIL-O-1380A
|
|
Parallelism:
|
< 10″
|
|
Perpendicularity:
|
< 5′
|
|
Clear Aperture:
|
> 90%
|
|
Surface Flatness:
|
< λ/10 @ 632.8 nm
|
|
Chamfer:
|
< 0.1 mm @ 45o
|
|
Size
|
Upon customer request
|
|
Coating
|
AR coating upon customer’s request
|
|
Damage Threshold
|
750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz
|
|
Quality Warranty Period
|
One
year under proper use
|
Why
Choose HGO ?
HG
OPTRONICS.,INC. has the ability to supply high quality Terbium Gallium
Garnet TGG Crystal in mass production quantity. TGG crystal is an essential
parts of isolators so strict quality control is applied to our TGG’s inclusions, absorption, scattering
loss, bulk loss, bulk stress and most importantly ER value. All the necessary
and essential specs can be physically measured in house.
In the past few years, the quantity of TGG crystals
increasing largely and we have become key supplier of top isolator manufactures
in world and HGO has a mass-production line for TGG crystals and have wide
experiences and strong ability to supply such crystals with large quantity and
in short delivery time.
