BaF2 Optical Crystals

BaF2 optical crystals BaF2 (Barium Fluoride) is used forwindows, lenses and prisms, particularly when transmission into the ultraviolet is desired. The transmission range of BaF2 is from 0.2 to 14µm. Transmission in the VUV is degraded by prolonged exposure to moist atmosphere.

Product Details

Barium FluorideBaF2

1 Description

Barium Fluoride (BaF2) crystals are transparent in wide spectrum band. The product finds use in windows, lenses of special types of objectives, as mirrors substrate in optical systems operating in UV and IR spectrum band.

Barium Fluoride is used for windows, lenses and prisms, particularly when transmission into the ultraviolet is desired. The transmission range of BaF2 is from 0.2 to 14µm. Transmission in the VUV is degraded by prolonged exposure to moist atmosphere, but it is not significantly degraded by exposure to high energy radiation. Barium Fluoride is the most resistant fluoride to high energy radiation but does not have VUV transmission of other types. Barium Fluoride is suitable for applications in the IR band (8 to 14 µm) and is often used as an IR viewport window for thermographs. The material is relatively hard but is very sensitive to thermal schock. Barium fluoride is grown by vacuum Stockbarger technique. In addition, BaF2 is usually used as scintillator for gamma detection. It is the fastest scintillating crystals up to now. Besides it can also be used as substrate for some applications.


2 Features

Excellent Transmission from 200nm to 7μm;

The most resistant fluoride to high energy radiation;

Sensitive to thermal shock


Applications

BaF2 lens

BaF2 wedges

BaF2 window

Infrared thermometer

Infrared thermal imager


3 Main Specifications

Main Specification

Conventional

High Precision

Materials

BaF2

BaF2

Orientation

<001> or <100>, <±0.5°

<001> or <100>, <±0.2°

Parallel

10〞

10〞

Perpendicular

10ˊ

surface Quality

40//20

10//20

Wavefront Distortion

λ/4@632nm

λ/8@632nm

Surface Flatness

λ/4@632nm

λ/8@632nm

Clear Aperture

>95%

>90%

Chamfer

<0.2×45°

<0.2×45°

Thickness/Diameter Tolerance

±0.1 mm

±0.1 mm

Maximum dimensions

dia200×50mm

dia200×50mm


4 Material characteristics

Physical and chemical characteristics

Properties (BaF2

 

Type of Material  

single crystal  

Crystal Structure  

cubic, CaF2 type structure     

Cleavage Planes  

(111)  

Density  

4.89 g/cm3  

Melting Point  

1386°C  

Molecular Weight  

175.36

Thermal Conductivity  

11.72 W/(m·K) @13°C  

Specific Heat  

410 J/(kg·K) @27°C  

Thermal Expansion  

18.1·10-6/°C (-100°C, +120°C)  

Hardness (Knoop)  

82(500g)

Young`s Modulus  

56.4 GPa  

Shear Modulus  

25.4 GPa  

Bulk Modulus  

268.89 GPa  

Rupture Modulus  

26.2 MPa  

Elastic Coefficient  

C11 = 90.4 ; C12 = 40.6 ; C44 = 25.3 GPa  

Apparent Elastic Limit

26.89 MPa

Dielectric Constant  

7.33 @f = 2 MHz  

Solubility in Water  

0.17g /100g @23°C  

Energy Gap:

9.1eV

Standard Diameter  

dia100 mm 


Optical characteristics

dn/dT

-15.2 x 10-6/oC

Poisson Ratio

0.343

Transmission Range

0.15 - 15 µm  

Refractive Index  

1.45 at 5 μm

Reflective Loss 

7.7% @0.6 µm; 6.0% @4.0 µm  


refractive Index




µm

n

µm

n

0.26

1.51

5.14

1.45

0.3

1.5

6.5

1.44

0.36

1.49

8

1.43

0.48

1.48

8.6

1.42

0.85

1.47

9.2

1.41

3.24

1.46

9.8

1.4


image001.jpg

Transmittance of BaF2 crysta


5 Standard products


Orientation

   Thickness, mm

  End configuration, mm

 Refractive index

<0 0 1>

0.5

10×10

1.45 @ 5000nm

<1 0 0>

<0 0 1>

1

<1 0 0>

<0 0 1>

1.5

<1 0 0>

<0 0 1>

2

<1 0 0>

<0 0 1>

2.5

<1 0 0>

<0 0 1>

3

<1 0 0>

* Customer designed products available



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