МAGNETOOPTIC STRUCTURES

  • Development of ferrite-garnet structures and based on them wave guiding elements for microwave frequency and extremely high frequency devices
  • Epitaxial nonmagnetic garnet structures for laser equipment
  • Epitaxial magnetooptic ferrite-garnet structures 

 

FIELDS OF APPLICATION

  • Garnet epitaxial structures production;
  • Magnetooptic devices for visualization and topography of magnetic fields spatial structure;
  • Magnetic field sensors and physical quantity transformers;
  • Lase equipment and fiber-optic communication lines;
  • Microwave frequency electronics.

SPECIFICATIONS

Garnet substrates

Parameters
Substrate material Gd3Ga5O12- GGG
Gd3-xCaxGa5-x-2yMgyZrx-yO12-CMZ GGG
Gd3Sc2Ga3O12-GSGG
Crystal lattice parameter, Å:
GGG
CMZGGG
GSGG
12,382 +- 0,001
12,496 +- 0,001
12,560 +- 0,001
Surface crystallographic orientation
GGG
CMZGGG
GSGG
(111); (100); (110)
(111); (100)
(111)
Surface crystallographic orientation deviation, degree +- 0,1
Surface diameter, mm
GGG
CMZGGG; GSGG
76; 100
76
Substrate thickness, mm 0,46 +- 0,03
Nonflatness, μm/cm From 0,5 per 80% of central region  

Magnetooptic epitaxial ferrite-garnet structures

Parameters
Structure diameter, mm 76; 100
Epitaxial film thickness, μm 1,0 - 100
Magnetic anisotropy type Uniaxial;
Planar («easy plane»)
Specific Faraday rotation per l=0,63 μm, degree/cm More than 104
Spatial resolution, μm To 0,5
Saturation magnetization,4nМs, gauss 50 - 1800
Magnetic saturation field intensity, oersted 10 - 1000;
300 - 10<sup4< sup="">
Sensitivity to magnetic field, oersted Not worse than 0,1;
Not worse than 10-5
Frequency range, Hz 0 - 106;
0 - 109
Operating temperature range, 0С 0 - 150;
-269 - 150

FIELDS OF APPLICATION

Magnetooptic visualization and topography of magnetic fields spatial structure

Magnetic field sensors and physical quantity transformers

Magnetooptical materials based on ferrite-garnet provide magnetic field linear and local transformation into optical signal. They are used as sensitive element in magnetic field sensors and in physical quantity transformers for sensors of:

  • spatial position;
  • linear translation;
  • rotation frequency;
  • acceleration;
  • electric current contact-free measurement.

Epitaxial structures of yttrium-ferrum garnet (YFG) and wave guiding elements based on them for microwave frequency devices

Parameters
Structure diameter, mm 76; 100
YFG epitaxial film thickness, μm 3,0 - 60
Saturation magnetization,4nМs, gauss 1750
Ferromagnetic resonance line width, oersted ‹ 0,5
Frequency range, GHz 3,5 - 18
Wave guiding element configuration and size Determined by photomask blank topology (provided by the customer)

Application of wave guiding elements based on YFG epitaxial structures

      Microwave frequency devices operating on magnetostatic waves (MSW) and produced by Russian industry.
    Convertible low-and-high-pass filter with electric frequency tuning. Operating frequency range – 4,0...20,0 GHz. Low-and-high-pass filter. Operating frequency range – 2,0...20,0 GHz.
    Quick-convertible low-and-high-pass filter. Operating frequency range – 8,0...10,1 GHz. Low-and-high-pass filter. Operating frequency range 8,0...11,5 GHz.

    Epitaxial garnet structures for laser equipment

    Epitaxial film chemical composition Substrate material Dopant Notes
    Gd3Ga5O12 GGG: Nd - Active laser element. Generation wavelength 1,062 μm
    Gd3Ga5O12 GGG Nd3+ Active laser element. Generation wavelength 1,062 μm
    Gd3Ga5O12 GGG: Yb Yb3+ Active laser element. Generation wavelength 1,038 μm
    Gd3Ga5O12 GGG Cr4+ и Ca2+ Active laser element. Generation wavelength 1,5 μm
    Gd3(Al,Sc)5O12 GGG Cr4+ и Ca2+ Active laser element. Generation wavelength 1,5 μm