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Jiaxing AOSITE Photonics Technology Co.,Ltd.
baf2 window
baf2 window
barium fluoride window

BaF2 Window Crystals

BaF2 crystals or Barium Fluoride crystals, with their extremely broad transmission range from the deep UV to LWIR spectrum, are prevalent for Infrared applications requiring additional transmission in the Ultraviolet region. BaF2 crystals windows are excellent when being used for IR spectroscopes and as viewport windows for thermal imaging inspection in electric power facilities and petroleum industries. A low refractive index of 1.48 implies BaF2 windows have high transmission rates without anti-reflection coating.


BaF2 has similar properties to CaF2, the difference mainly lies in that barium fluoride is more resistant to highly energetic radiation, and with an equivalent thickness, the transmission range of BaF2 extends approximately 1 micron further into the long-wave IR region than calcium fluoride. BaF2 could also accommodate high-temperature environments up to 800 ℃. However, exposure to moisture will increase its sensitivity to temperature and reduce its transmission rate to UV lights.



Application of BaF2 Window Crystals


  • Infrared and ultraviolet windows/prism

  • High energy physics

  • Nuclear physics

  • Nuclear medicine


Advantages of BaF2 Window Crystals


  • Excellent Transmission from 200nm–12μm

  • Resistant to High-Energy Radiation

  • Provide High Transmission without AR Coatings


Specifications of BaF2 Window Crystals


Orientation

Random or as requested

Size

Upon the customer’s request

Diameter Tolerance

+0/-0.1 mm

Thickness Tolerance

+/-0.1 mm

Aperture

>90%

Surface Quality

80/50~10/5 (S/D)

Parallelism

<1 arc minute

Chamfer

0.2-0.5mmx45°

Coating

Uncoated or upon customer’s request


Properties of BaF2 Window Crystals


Transmission Range

0.15 to 12 microns

Refractive Index

1.45 at 5 microns

Refractive Loss

6.5% at 5 microns

Crystal/Class Structure

Cubic CaF2

Cleavage Plane

(111), Perfect

Density

4.89 g/cc

Hardness(Knoop)

Knoop 82 with 500g indenter

Youngs Modulus

53.07 GPa

Shear Modulus

25.4 GPa

Bulk Modulus

56.4 GPa

Poisson Ratio

0.343

Elastic Limit

26.9 Mpa (300psi)

Molecular Weight

175.36

Thermal Expansion

18.1×10^-6/℃ at 273K

Thermal Conductivity

11.72 W m-1K-1 at 286K

Melting Point

1386 ℃

Specific Heat Capacity

410 J Kg-1K-1

Thermal Expansion

18.1×10^-6/℃ at 273K

Solubility

0.17g/100g water at 23℃


Technical Images of BaF2 Window Crystals

QQ图片20170625145738.png



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Head Office: No. 66, 8 Group, Chengbei Village, Yanguan Town, Jiaxing 314411, China;

Hangzhou Branch: Room 1012, Chunhua Bussiness Center, No. 159, Hangbo Street, Shangcheng District, Hangzhou 310009, Zhejiang, China
sales@ostphotonics.com; info@ostphotonics.com +86-0571-86780460