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BaF₂ Crystal

POC-OC-122471-BaF₂ Crystal

  • Wide transmittance range from UV to IR (150 nm to 14 µm).
  • High transmittance of >94% at 350 nm to 10.8 µm.
  • Excellent scintillation properties for high-energy physics applications.
  • Low absorption coefficient suitable for precision optical components.
  • Custom crystal dimensions and orientations available upon request.

Customizable Components Available for This Material to Meet Your Specific Needs!

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General Description

BaF₂ (Barium Fluoride) is a high-performance optical material belonging to the cubic crystal system. Known for its excellent optical transmittance across a wide spectral range from UV to IR wavelengths, BaF₂ crystals are widely utilized in optical windows, lenses, and prisms. These crystals exhibit excellent radiation resistance and scintillation properties, making them highly desirable in applications like high-energy physics, nuclear medicine, and spectroscopy.

BaF₂ also demonstrates remarkable thermal and mechanical stability, which enhances its performance in demanding environments. Its high UV transmittance is particularly suited for ultraviolet spectrometry and related fields. Additionally, BaF₂ is available in both monocrystalline and polycrystalline forms, ensuring versatility for diverse applications.

General Applications and Examples

BaF₂ crystals are utilized in a variety of fields due to their outstanding optical and scintillation properties:

  1. Optical Components: Fabrication of optical windows, prisms, and lenses for UV and IR applications.
  2. Scintillation: Used as scintillation crystals in high-energy physics experiments, nuclear medicine imaging, and radiographic detectors.
  3. Infrared Thermography: Ideal for IR viewport windows ranging from 8 µm to 14 µm.
  4. UV Spectroscopy: Employed in ultraviolet spectrometry due to high transmittance in the UV range.
  5. Custom Optical Devices: OEM services for tailored BaF₂ crystal blanks, ensuring compatibility with specific optical system requirements.

Chemical and Structural Properties

Properties

Details

Material Grade

VIR, UV, Scintillating Crystals

Crystal Structure

Cubic System

Cleavage Plane

(111)

Density

4.89 g/cm³

Melting Point

1280 °C

Thermal Conductivity

11.72 W/m·K at 286 K

Thermal Expansion

18.1 × 10⁻⁶ /°C at 273 K

Knoop Hardness

82 kg/mm²

Solubility

0.0017 g @ 23 °C

Young’s Modulus (E)

53.07 GPa

Shear Modulus (G)

25.4 GPa

Bulk Modulus (K)

56.4 GPa

Apparent Elastic Limit

26.9 MPa (3900 psi)

Poisson Ratio

0.343

Optical Properties

Properties

Details

Transmittance Range

0.15 µm – 14 µm

Transmittance

>94% at 350 nm – 10.8 µm

Refractive Index

1.4624 at 2.58 µm / 1.3936 at 10.35 µm

Reflection Loss

6.8% at 2.58 µm / 5.3% at 10.35 µm

Radiation Length

20.6 mm

Residual Radiation Peak

47 nm

Decay Constant

620 ns (slow), 0.6 ns (fast)

Emission Peak

310 nm (slow), 220 nm (fast)

Light Output

20% (slow), 4% (fast)

Absorption Coefficient

3.2 × 10⁻⁴ @6 µm

dn/dT

-15.2 × 10⁻⁶

Standard Fabrication Specifications

Specification

Details

Maximum Diameter

Up to 300 mm

Clear Aperture

>85%

Surface Quality

20/10

Surface Flatness

λ/4 @ 633 nm

Crystal Orientation

<111>, <100>, or custom

Mount

Upon Customer’s Specification

Spectrum Transmission Curve

Transparency Range: BaF₂ exhibits high transmittance from UV to IR, with >94% transmittance in the range of 150 nm to 10.8 µm.

 

 

POC-Barium Fluoride (Baf2) Crystal Spectrum Transmission Curves
POC-BaF2 Crystal Spectrum Transmission Curves

Coating Specification

  • Coating Options: AR coating (350-1200 nm) and custom coatings available upon request.
  • Surface Quality: 20/10.
  • Flatness: λ/4 @ 633 nm.

 

  • Adhesion Test: Compliant with MIL-C-675C military standards, an adhesion test involved applying a tape that meets LT-90 specifications onto the lens film layer. The tape was affixed fully and then removed vertically. This procedure was performed three times, resulting in no blistering or peeling.
  • Temperature Test: In line with MIL-C-675C specifications, test pieces were subjected to temperatures of -62±1℃ and 71±1℃. After maintaining them at room temperature (16℃~32℃) for two hours, the adhesion test was repeated, confirming no film detachment.
  • Abrasion Resistance Test: Conforming to MIL-C-675C and CCC-C-440 standards, the abrasion resistance test involved a gauze tester applying a minimum force of 1.0 lbs (0.45 kg) to the film. This was repeated 25 times with gauze widths of 1/4 inch (6.4mm) and 3/8 inch (9.5mm), ensuring no damage occurred to the film surface.
  • Humidity Test: Under MIL-C-675C criteria, the test piece was placed in a controlled temperature and humidity chamber set to 49 ±2℃ and 95%~100% humidity for 24 hours. The film remained intact, with no peeling, scratches, or other defects.
  • Solvent and Cleaning Testing: Following MIL-C-675C specifications, test pieces were exposed to room temperature conditions (16℃~32℃) and tested with acetone and alcohol for at least 10 minutes each. After air drying and subsequent cleaning with a cotton cloth soaked in alcohol, the film surface showed no signs of peeling or scratches.
  • Salt Spray Test: After 100 hours in a 35°C environment with a 5% saltwater concentration, the film showed no signs of damage.
Face Dimensions (mm) Length (mm) Coating SKU Price (USD)
15 x 15 15 Uncoated 7273 440
30 x 30 30 AR (450-800 nm) 7276 600
50 x 50 50 AR (450-800 nm) 31051 900
Customization Available On Request As per demand N/A Varies

POC-OC-122471-BaF₂ Crystal

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