Magneto-optical crystal for faraday rotator

Faraday rotator

When a beam passes through a magnetic medium, the Faraday result causes a rotation in the direction of the light’s polarization, that is, the beam’s polarization axis revolves clockwise by an Angle seen from the onlooker’s perspective. If the outgoing light is reflected back to the original medium, the viewer will observe that the polarization axis of the light has been revolved clockwise by the very same Angle. An optical rotator made from this Faraday impact is a Faraday rotator.

Magneto-optical crystals

Magneto-optical crystals are crystalline materials with magneto-optical impact. The Magneto-optical crystals can be divided into three classifications:

  • Ferromagnetic magneto-optical crystals
  • Paramagnetic magneto-optical crystals
  • Diamagnetic magneto-optical crystals

Magneto-optical crystals are widely made use of in optical interaction, computer storage space, microwave devices as well as other areas because of their large Faraday effect, reduced wavelength absorption coefficient, high permeability and also high magnetization. Magneto-optical crystals can be widely made use of in optical device manufacturing fields such as optical modulator, optical isolator, optical ring, optical stage shifter, optical button, as well as optical storage space, optical display, optical recorder, microwave devices, laser gyro and various other storage space as well as microwave tool manufacturing areas.

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Faraday isolators and spinners based upon Terbium gallium garnet (TGG) have remained the sector requirement until now, as TGG has actually been made use of in the isolators as well as rewriters market as Faraday crystals with modern-day crystal growth techniques and precise control of basic materials.

TGG crystal is the very best magneto-optical material for making Faraday optometer as well as isolator, suitable for wavelength 400-1100nm (omitting 470nm-500nm). TGG single crystal has high magneto-optical constant, reduced light loss, high thermal conductivity and also high laser light damage limit, and also is widely made use of in YAG, Ti-doped sapphire as well as other multistage amplification, ring type, seed injection laser.

The main advantages:

  • Big magneto-optical constant (35 Rad T-1 m-1).
  • Reduced light loss (<0.1%/ cm).
  • High thermal conductivity (7.4 W m-1K-1).
  • High laser damages threshold (>1GW/cm2).
  • Large Verdet Constant (35 Rad T-1 m-1).
  • Low optical losses (<0.1%/ centimeters).
  • High thermal conductivity (7.4 W m-1K-1).
  • High laser damages threshold (>1GW/cm2).


TSAG is the key isolation material of the future generation fiber laser. As a perfect visible and also infrared magneto-optical crystal, TSAG has the advantages of high Verdet constant, excellent thermal and mechanical properties.

Terbium-scandium-aluminum garnet (TSAG) crystals are ideal magneto-optical products for both visible and infrared wavelengths (wavelength array: 400-1600nm). TSAG crystal has the advantages of high stability, great thermal as well as mechanical residential properties, as well as is a crucial crystal for the next generation of high power laser.

Compared with TGG crystals, TSAG has higher area continuous and also reduced absorption loss, which can make the isolator smaller sized, and is an ideal material for optical isolators with high power.

The main advantages:

  • Verdet constant 20% more than TGG (65radT-1m-1 at 1064nm).
  • Reduced Absorption(<3000ppm/cm at 1064nm).
  • High power compliant.
  • Reduced thermally-induced birefringence.
  • Make isolator a lot more compactand smaller.


Rare earth trifluoride crystals, such as CeF3 and also PrF3, are exceptional brand-new magneto-optical products without “core” as well as have high use price of crystal spaces.

The Verdet constant worth of CeF3 crystal coincides as that of TGG crystal at 1310nm wave size, which suggests that the crystal can be suitable for Faraday isolator in close to infrared band, and becomes one of the potential prospects to replace business magneto-optical products.

Faraday rotating glass

Faraday magneto-optical glass (RAre-earth Faraday magneto-optical glass) is a brand-new type of useful material, which has a broad application possibility in the field of fiber optics interaction as well as picking up because of its excellent anisotropic harmony, excellent magneto-optical properties and affordable.

Magnetically revolving glass, additionally referred to as Faraday turning glass, is a brand-new transparent optical useful material created in current decades. It can turn the polarization plane of a beam of linearly polarized light parallel to the electromagnetic field. Magnetic optically rotating glass is the core material of high-tech intensive products, which is widely made use of in the sophisticated fields of optics, electricity and magnetism. As an example, this product can be made use of to make optical isolator, magneto-optical modulator, magneto optical attenuator, magneto optical switch, magneto optical sensing unit as well as a selection of high-precision gyroscope in fiber communication.

Verdet constant

Verdet constant is an extremely important specification in magneto-optical products. Although YFeOGdBiFeOz and also other rare earth iron garnet crystals (YIG) have exceptionally high Verdet consistent and also high transmittance in the infrared region, they are not transparent to visible light, and can just be applied in the infrared area when they are made use of as Faraday rotating components, with tough growth as well as long period. The Verdet constant of magneto-optical glass is smaller than that of crystal series, yet it shows strong vitality in the application of magneto-optical devices due to a collection of benefits such as good light transmittance, good optical uniformity, small cost, prominent resources, particularly simple to create large-size items.

Along with identifying the function of the isolator as well as the adaptability of the front and back side user interfaces, many criteria such as accuracy, result surge, temperature level drift, sound and also feedback time require to be very carefully picked by the customer.


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