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BaF2 Crystal

18 Dec 2020

Barium fluoride (BaF2) is a general-purpose optical window material that offers a wide range of transparency, from the ultraviolet to the long-wave infrared, with low reflectance loss and low dispersion. BaF2 single crystal is an intensively studied scintillator for the detection of gamma radiation due to its relatively high stopping power, radiation hardness and extremely fast response. BaF2 possesses the fast cross-luminescence component at 195 and 220 nm with a lifetime of several hundred picoseconds. However, this component coexists with slow one at 310 nm related to the self-trapped exciton (STE). BaF2 is a broad band gap crystal with Eg=10:9 eV. It is currently regarded as the fastest inorganic scintillator which has cross-luminescence bands peaked at 195 and 220 nm and a broad band peaking at about 300 nm due to self-trapped excitons. Much attention has been focused on the luminescent properties of rare earth ions activated BaF2.

Parameter

Material and Specifications

Orientation [100] or [111] < ±0.5°
Angle Tolerance < 0.5°
Parallelism <20〞
Perpendicularity
Surface Quality 10-5 (MIL-O-13830A)
Wavefront Distortion <λ/4@633 nm
Surface Flatness <λ/8 @633 nm
Clear Aperture >90%
Thickness/Diameter Tolerance ±0.05 mm

Physical and Chemical Properties

Crystal System Isometric
Habit Cubic
Space Group Fm3m(Oh5
Lattice Constants 6.2001 Å
Specific mass 4.886 g/cm3
Melting Point 1354°C
Flexure Strength (MPa) 27
Tenacity Brittle
Thermal Conductivity /(W·cm-1·K-1@25°C) 0.07
Specific Heat/ (J·g-1·K-1) 1.003
Thermal Expansion /(10-6·K-1@25°C ) 13.7
Hardness (kg/mm2@Knoop) 78
Young`s Modulus /GPa 138.5
Fracture  {111} and {100}

Optical characteristics

Transmission Range 0.15 … 12 µm  
Reflective Loss  6 … 16%@0.2 … 10 µm 
Thermo-optic coefficient(10-6·K-1@30…90°C ) -18.8
Poisson Ratio 0.31
Dielectric Constant 7.33@f=2MHz

Index of Refraction

λ(μm) n λ(μm) n λ(μm) n
0.2 1.5573 4 1.4558 9 1.4144
0.5 1.4779 5 1.4511 10 1.4011
1 1.4686 6 1.4441 11 1.3865
2 14647 7 1.4357 12 1.3696
3 1.4612 8 1.4258 12.5 1.3585
        15 1.305

Spectrum 

Feature

  • Excellent transmission from 150nm to 12um
  • Chemically stable
  • Low reflectance loss and low dispersion 
  • High stopping power, radiation hardness and extremely fast response
  • Broad band gap
  • Susceptible to thermal shock
  • Possesses the fast cross-luminescence component at 195 and 220 nm with a lifetime of several hundred picoseconds

Application

  • Window and focusing mirror for deep uv and excimer lasers
  • Scintillator,IR optics
  • Inorganic scintillator for subnanosecond timing

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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