Magneto-optical crystals for rotator


Magneto-optical crystals for rotator

When a beam passes through a magnetic medium, the Faraday impact causes a rotation towards the light's polarization, that is, the light beam's polariz

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When a beam passes through a magnetic medium, the Faraday impact causes a rotation towards the light’s polarization, that is, the light beam’s polarization axis rotates clockwise by an Angle seen from the observer’s perspective. If the outward bound light is reflected back to the original tool, the observer will notice that the polarization axis of the light has been turned clockwise by the same Angle. An optical rotator made of this Faraday effect is a Faraday rotator.

Magneto-optical crystals are crystalline materials with magneto-optical effect. Magneto-optical crystals can be divided into 3 classifications:

  • ferromagnetic magneto-optical crystals
  • paramagnetic magneto-optical crystals
  • diamagnetic magneto-optical crystals

Magneto-optical crystals are commonly utilized in optical interaction, computer system storage, microwave tools and also other areas because of their big Faraday result, low wavelength absorption coefficient, high permeability and high magnetization. Magneto-optical crystals can be commonly made use of in optical tool production areas such as optical modulator, optical isolator, optical ring, optical phase shifter, optical switch, in addition to optical storage, optical display screen, optical recorder, microwave gadgets, laser gyro and also other storage space and also microwave gadget production areas.


Faraday isolators and spinners based on Terbium gallium garnet (TGG) have remained the industry standard previously, as TGG has actually been used in the isolators as well as rewriters sector as Faraday crystals with modern crystal development approaches as well as exact control of resources.

TGG solitary crystal is the very best magneto-optical product for making Faraday optometer and isolator, appropriate for wavelength 400-1100nm (omitting 470nm-500nm). TGG solitary crystal has high magneto-optical continuous, reduced light loss, high thermal conductivity and high laser light damage threshold, as well as is widely utilized in YAG, Ti-doped sapphire and other multistage boosting, ring kind, seed injection laser.

The Main Advantages:

  • Large magneto-optical continuous (35 Rad T-1 m-1)
  • Low light loss (< 0.1%/ cm)
  • High thermal conductivity (7.4 W m-1K-1)
  • High laser damage limit (> 1GW/cm2)
  • Huge Verdet Continuous (35 Rad T-1 m-1)
  • Reduced optical losses (< 0.1%/ centimeters)
  • High thermal conductivity (7.4 W m-1K-1)
  • High laser damages limit (> 1GW/cm2)


TSAG is the key isolation product of the next generation fiber laser. As a suitable noticeable and also infrared magneto-optical crystal, TSAG has the advantages of high Verdet constant, superb thermal and also mechanical residential or commercial properties.

Terbium-scandium-aluminum garnet (TSAG) crystals are excellent magneto-optical materials for both visible as well as infrared wavelengths (wavelength variety: 400-1600nm). TSAG crystal has the advantages of high security, excellent thermal and also mechanical properties, and also is a necessary crystal for the future generation of high power laser.

Compared with TGG crystals, TSAG has higher field constant and lower absorption loss, which can make the isolator smaller sized, and is an optimal material for optical isolators with high power.

The Main Advantages:.

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


Rare earth trifluoride crystals, such as CeF3 and also PrF3, are outstanding brand-new magneto-optical materials without “core” as well as have high utilization price of crystal blanks.

The Verdet consistent value of CeF3 crystal is the same as that of TGG crystal at 1310nm wave length, which indicates that the crystal can be suitable for Faraday isolator in close to infrared band, as well as becomes one of the potential prospects to replace commercial magneto-optical materials.

Faraday turning glass

Faraday magneto-optical glass (RAre-earth Faraday magneto-optical glass) is a new sort of functional material, which has a wide application possibility in the field of fiber optics interaction and noticing as a result of its great anisotropic uniformity, outstanding magneto-optical residential or commercial properties and low cost.

Magnetically turning glass, also called Faraday revolving glass, is a new clear optical useful material created in recent years. It can turn the polarization plane of a light beam of linearly polarized light alongside the magnetic field. Magnetic optically rotating glass is the core product of high-tech extensive products, which is commonly utilized in the high-tech areas of optics, electrical energy and magnetism. For example, this material can be utilized to make optical isolator, magneto-optical modulator, magneto optical attenuator, magneto optical switch, magneto optical sensing unit and a range of high-precision gyroscope in fiber interaction.

Verdet consistent

Verdet consistent is a very crucial criterion in magneto-optical materials. Although YFeOGdBiFeOz and other rare earth iron garnet crystals (YIG) have incredibly high Verdet continuous as well as high passage in the infrared region, they are not clear to visible light, and can only be used in the infrared region when they are used as Faraday turning components, with tough development and long period. The Verdet constant of magneto-optical glass is smaller sized than that of crystal collection, but it shows solid vitality in the application of magneto-optical tools as a result of a series of advantages such as excellent light transmittance, great optical uniformity, low price, preferred resources, especially easy to create large-size products.

In addition to identifying the function of the isolator and the versatility of the front and rear end user interfaces, many criteria such as precision, output ripple, temperature drift, noise and also response time require to be very carefully picked by the customer.