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Magneto Optical

Introduction

Terbium Gallium Garnet (Tb3Ga5O12, TGG) is an excellent magneto-optical crystal used in various Faraday devices (Rotators and Isolators) in the range of 400 nm-1100 nm, excluding 475 nm-500 nm.

 

CASTECH's magneto-optical crystal TGG  is featured by    •   Large Verdet constant (35 Rad T-1 m-1)
    •  High thermal conductivity (7.4 W m-1 K-1)
    •  High laser damage threshold (> 1 GW/cm2)

 

Table 1. Basic Properties

Chemical Formula

Tb3Ga5O12

Lattice Parameter

a = 12.355 Å

Growth Method

Czochralski

Density

7.13 g/cm3

Melting Point

1725℃

Mohs Hardness

8 Mohs

Refractive Index

1.954 @1064 nm

 

 Specifications of TGG crystal from CASTECH

 

Table 2. Specifications

Orientation

[111] within ±15′

Extinction Ratio

> 30 dB

Diameter Tolerance

± 0.1 mm

Length tolerance

± 0.2 mm

Surface Quality (Scratch/Dig)

10/5 to MIL-PRF-13830B

Flatness

< λ/8 @633 nm

Wavefront Distortion

< λ/8 @633 nm

Parallelism

20 arc sec

Perpendicularity

≦ 15 arc min

Chamfer

≦ 0.2 mm × 45°

AR coating

< 0.2% at 1064 nm