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MgF2 Crystal

18 Dec 2020

Magnesium Fluoride (MgF2) is commonly used for UV windows, lenses and polarisers. It is also useful in its transmission range for some IR spectroscopy applications. Magnesium Fluoride (MgF2) Windows offer excellent broadband transmission from the deep-UV to the mid-infrared. DUV transmission makes them ideal for use at the Hydrogen Lyman-alpha line and for UV radiation sources and receivers, as well as excimer laser applications. Windows, lenses, and prisms made of this material can be used over the entire range of wavelengths from 0.120 μm (vacuum ultraviolet) to 8.0 μm (infrared). MgF2 is tough and works and polishes well, but it is slightly birefringent and should be cut with the optic axis perpendicular to the plane of the window or lens, Generally, Magnesium Fluoride for laser use is recommended to be oriented along the optic axis to avoid birefringent effects. It is particularly useful for excimer laser application.

Parameter

Material and Specifications

Orientation [100] or [001] < ±0.5°
Orientation Tolerance < 0.5°
Parallelism 5〞
Perpendicularity
Surface Quality 10-5 (Scratch/Dig)
Wavefront Distortion <λ/4@632 nm
Surface Flatness <λ/8 @632 nm
Clear Aperture >90%
Chamfer <0.1×45°
Thickness/Diameter Tolerance ±0.05 mm
Maximum Dimensions Dia150 mm×60mm(C-cut)

Physical and Chemical Properties

Crystal Structure tetragonal
Lattice Constants 4.64
Density 3.18 g/cm3
Melting Point 1255°C
Thermal Conductivity /(W·m-1·K-1@25°C) 0.3
Specific Heat/ (J·g-1·K-1) 1.003
Thermal Expansion /(10-6·K-1@25°C ) 13.7
Hardness (Mohs) 4.15
Young`s Modulus /GPa 138.5

Optical characteristics

Transmission Range 0.11 … 7.5 µm  
Refractive Index   no = 1.3836, ne = 1.3957 @0.405 µm  
Reflective Loss  5.1% @4.0 µm; 11.2% @0.12 µm  
Poisson Ratio 0.271

Index of Refraction

μm No Ne μm No Ne μm No Ne
0.1137 1.7805   0.1149 1.742   0.1179 1.68  
0.1198 1.651   0.121 1.628 1.632 0.13 1.566 1.568
0.14 1.5095 1.523 0.15 1.48 1.494 0.16 1.461 1.475
0.17 1.448 1.462 0.18 1439 1.453 0.19 1.431 1.444
0.2 1.423 1.437 0.22 1.413 1.426 0.248 1.403 1.416
0.257 1.401 1.414 0.266 1.399 1.412 0.28 1.396 1.409
0.3 1.393 1.405 0.33 1.389 1.402 0.337 1.389 1.401
0.35 1.387 1.4 0.355 1.386 1.399 0.4 1.384 1.396
0.546 1.379 1.39 0.7 1.376 1.388 1.087 1.373 1.385
1.512 1.37 1.382 2 1.368 1.379 2.5 1.364 1.375
3.03 1.36 1.37 3.571 1.354 1.364 4 1.349 1.359
4.546 1.341 1.35 5 1.334 1.343 5.556 1.324 1.332

Spectrum 

Feature

  • Excellent transmission from 120nm to 7um
  • Chemically stable
  • Large resistance to thermal shock
  • Irradiation does not lead to color centers
  • Uniformly distributed Co

Application

  • Window and focusing mirror for deep uv and excimer lasers
  • Optical fiber communication,
  • Wave plate,High Energy WavePlate
  • Achromatic Waveplates
  • Glanprisms

CONTACT DETAILS
Nanjing Crylink Photonics Co.,Ltd
No.3, Hengda Road, Economic and Technological Development Zone, Nanjing, China
No.200,Zhaoxian Road,Jiading District,Shanghai City
Nanjing
Jiangsu
210038
China
Tel: (86)025-68790684
Fax: (86)025-68790685
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