Magneto-optical crystal

/TGG crystal Terbium Gallium Garnet

TGG crystal Terbium Gallium Garnet

TGG is an excellent magneto-optical crystal used in various Faraday devices(Polarizer and Isolator) in the range of 400nm-1100nm, excluding 475-500nm.

  • Product Origin:

  • Shipping Port:

    Fuzhou, China
  • Lead Time:

Share To : f t y b l ins
  • Product Detail


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


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:


Lattice Parameter


Growth Method




Mohs Hardness


Melting Point


Refractive Index

1.954 at 1064nm

HGO offers TGG specifications:


<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


Surface Quality:

10/5 Scratch/Dig MIL-O-1380A


< 10


< 5

Clear Aperture:

> 90%

Surface Flatness:

< λ/10 @ 632.8 nm


< 0.1 mm @ 45o


Upon customer request


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.

Leave A Message
If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.
Related Products
retardation plates or phase shifters

Waveplates (retardation plates or phase shifters) are made from materials which exhibit birefringence. The velocities of the extraordinary and ordinary rays through the birefringent material varies inversely with their refractive indices. This difference in velocities gives rise to a phase difference when the two beams recombine.

Read More
high laser induced damage threshold Er:Yb:glass
Er:Yb:glass crystal Erbium and ytterbium co-doped phosphate glass

Er3+, Yb3+ co-doped phosphate glass is a well-known and commonly used active medium for lasers emitting in the “eye-safe” spectral range of 1,5-1,6 µm. As an eye-safe wavelength laser, 1540um ,Er3+/Yb3+ co-doped phosphate glass lasers have attracted much attention for their compactness and low cost, such as laser generation and signal amplification because the wavelength of 1540nm is just at the position of the eye-safe and the fiber optic communication window. 1540nm lasers have used in ranging finder, radar, target recognition. Er3+/Yb3+ co-doped phosphate glass cooperate with passive Q-Switch crystal cospinel can get 1540nm pulse solid-state laser.

Read More
High purity Nd:YVO4 laser crystals
Nd:YVO4 Neodymium Doped Yttrium Orthovanadate laser crystals

Nd:YVO4 (Neodymium Doped Yttrium Orthovanadate) crystals is one of the most promising commercially available diode pumped solid state laser materials, especially, for low to middle power density. This is mainly for its higher absorption and emission features than Nd:YAG crystal. Pumped by laser diodes, Nd:YVO4 crystal has been incorporated with high NLO coefficient crystals ( LBO, BBO, or KTP) to frequency-shift the output from the near infrared to green, blue, or even UV. This incorporation to construct all solid state lasers is an ideal laser tool that can cover the most widespread applications of lasers, including machining, material processing, spectroscopy, wafer inspection, light displays, medical diagnostics, laser printing, and data storage, etc. It has been shown that Nd:YVO4 based diode pumped solid state lasers are rapidly occupying the markets traditionally dominated by water-cooled ion lasers and lamp-pumped lasers, especially when compact design and single-longitudinal-mode outputs are required.

Read More
MgF2 crystal window
MgF2 crystal Magnesium Fluoride

MgF2 or Magnesium Fluoride is positive uni-axial crystal with a very high optical transmittance from the vacuum UV to IR. It is regularly used for optical elements where extreme ruggedness and durability is required. It also has a large resistance to mechanical and thermal shock, to optical radiation, and is chemically stable, making it a very useful materials for UV and IR optics.

Read More
LiNbO3 LN nonlinear crystal
LiNbO3 crystal Lithium niobate

LiNbO3 is widely used as electro-optic modulators and Q-switches for Nd:YAG, Nd:YLF and Ti:Sapphire lasers as well as modulators for fiber optics.

Read More
Pure YVO4 Yttrium Orthovanadate crystals
YVO4 crystal Yttrium Orthovanadate

The Yttrium Orthovanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method. It has good temperature stability and physical and mechanical properties. It is ideal for optical polarizing components because of its wide transparency range and large birefringence. It is an excellent synthetic substitute for Calcite (CaCO3) and Rutile (TiO2) crystals in many applications including fiber optic isolators and circulators, interleavers, beam displacers and other polarizing optics.

Read More
IAD EB  IBS Coating service
Crystals and Optics coating service

HGO have advanced coating machines which can meet endusers’different application requirement. We can very high laser induced damaged threshold coating with IAD, EB and IBS coating techniques , also Cr-Au, Aluminum and silver mental coating can also be available in HGO. Customers are very welcome to contact with us for further information.

Read More
Pure YAG window crystal
YAG window crystals Yttrium Aluminum Garnet

Pure YAG Yttrium Aluminum Garnet is a new substrate and window material that can be used for both UV and IR optics. It is particularly useful for high-temperature and high-energy applications. The mechanical and chemical stability of YAG is comparable to sapphire crystal, but YAG is unique with no birefringence which is extremely important for some optical applications.

Read More
Leave A Message
Leave A Message
If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.