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Barium Fluoride

Product catalog summary

Overview: Hellma Materials provides Barium Fluoride (BaF2) for VIS/IR applications, known for its wide bandwidth and superior internal transmittance, making it ideal for thermal imaging and surveillance.

Specifications:

Forms: Cut/ground blanks, blocks, rods, prisms.
Crystallinity: Polycrystalline or monocrystalline.
Diameter: Up to 380 mm (polycrystalline), 200 mm (monocrystalline).
Thickness: Up to 250 mm (polycrystalline), 150 mm (monocrystalline).
Crystal Orientation: <111>, random, others upon request.

Optical Properties:

High transmittance (T > 99% @ 7µm).
Low spectral dispersion for aberration and color correction.
Refractive indices vary from 1.46861 at 1.0 µm to 1.38660 at 11.0 µm.
Sellmeier dispersion formula provided for refractive indices.

Chemical Properties:

Solubility in water: 0.17 g/100g at 23°C.
Molecular weight: 175.3.
Crystal structure: Cubic with cleavage planes (111).

Thermal Properties:

Melting point: 1386°C.
Specific heat capacity: 410 J/(kg K).
Thermal conductivity: 11.72 W/(m K) at 13°C.
Linear thermal expansion coefficient: 18.1 x 10^-6 / K at 0°C.

Mechanical Properties:

Young’s Modulus: 53.07 GPa at 25°C.
Shear Modulus: 25.4 GPa at 25°C.
Bulk Modulus: 56.4 GPa at 25°C.
Poisson Ratio: 0.343.
Knoop Hardness: 82.
Mohs Hardness: 3.
Density: 4.89 g/cm³.

Contact Information: Hellma Materials GmbH, Germany, with local representatives in China, North America, Japan, UK, France, Italy, and Israel.

Catalog excerpts

Barium Fluoride VIS/IR applications

Open the catalog to page 1

Hellma Materials Barium Fluoride is the material of choice for wide bandwidth applications covering the VIS, near-IR and mid-IR range. It is an optical crystal grown from highly purified synthetic raw material and features a superior internal transmittance (T > 99% @ 7pm) enabling advanced applications in thermal imaging, night vision and surveillance imaging using integrated VIS and IR detector channels. Low spectral dispersion makes BaF2 the preferred optical material for aberration and color correction.

Open the catalog to page 2

Properties of Barium Fluoride Refractive indices n (at 22.6°C (± 0.3°C )) 1 relative to air, tolerance of refractive indices: ± 1 x 10-4 Chemical properties Thermal properties (1) Handbook of Optics, 3rd edition, Vol. 4. McGraw-Hill 2009 (2) D.Girlich; Elastic Constants of BaF; Phys.Rev. Vol135, p1826, 1964 (5) B. Leviton et al, Proc. of SPIE Vol. 5904, 2005

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Hellma Materials GmbH Moritz-von-Rohr-StraRe 1 07745 Jena / Germany phone + 49 3641 2877-0 fax + 49 3641 2877-200 [email protected] www.hellma-materials.com For inquiries please contact our local Sales Representative North America Ms Dawn Jennings Silicon Sense, Inc. phone + 1 603 891 4248 fax + 1 603 891 4264 mobile + 1 603 566 8687 [email protected] For inquiries please contact our local Distributor Ms Judy Lim Hellma Asia Pte Ltd. phone + 65 6397 4138 fax + 65 6397 4139 [email protected] Mr Koichi Inaba Hellma Materials GmbH Japan Branch Office phone + 81 45 440 6617 fax + 81...

Open the catalog to page 4

Barium Fluoride

Barium Fluoride

Catalog excerpts

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