Single-Crystal Wafers & Substrates
BaF₂ Optical Substrates
BaF₂ single-crystal substrates for infrared windows and FTIR spectroscopy, with dimensions and polished optical surfaces specified for the instrument.
- Germany-based supplier and manufacturing partner
- Manufacturing to customer specifications
- Optical inspection and measurement against specified requirements
- From single components and prototypes to repeat supply
Product overview
Custom BaF₂ substrates can be specified with customer-defined dimensions and optical surface finishes.
Barium fluoride (BaF₂) is a cubic, optically isotropic single-crystal material with broad transmission from the ultraviolet into the long-wave infrared (LWIR). Its broad optical transmission and relatively low refractive index make it suitable for infrared optics and broadband transmission applications.
Key advantages
- Cubic crystal structure with no intrinsic birefringence
- Broad optical transmission from the UV to the long-wave infrared (LWIR)
- Low refractive index, resulting in relatively low Fresnel reflection losses at uncoated surfaces
- Low optical dispersion, suitable for broadband optical applications
Properties
- Chemical formula
- BaF₂
- Crystal structure
- Cubic, fluorite-type; Fm-3m (No. 225)
- Molecular weight
- 175.32 g/mol
- Density
- 4.89 g/cm³
- Lattice constant
- 6.196 Å
- Cleavage plane
- (111)
- Melting point
- 1368 °C
- Mohs hardness
- 3
- Thermal expansion coefficient
- 18.1 × 10⁻⁶ K⁻¹ near room temperature
- Transmission range
- 0.15–12 µm, depending on material grade and thickness
- Refractive index
- 1.473 at 633 nm; 1.45 at 5 µm
Typical applications
- Infrared optical windows and instrument viewports
- Infrared spectroscopy, including FTIR systems
- Thermal imaging and thermography systems
- Infrared optical instrumentation and measurement systems
- UV–IR optical research
- Optical coating development and evaluation
View related products
CaF₂ Single-Crystal Substrates
For UV optics, spectroscopy, and thin-film research, with custom dimensions, crystal orientations, and surface finishes.
MgF₂ Single-Crystal Substrates
For VUV/UV optics, spectroscopy, and thin-film research, with options for custom crystal orientations, dimensions, and polished surfaces.
Optical Windows
Flat, wedged, tubular, and Brewster window configurations, including chip-free, unchamfered edge options.
RFQ PREPARATION
What to send for a quote
Please send your drawing or technical specification together with the following information.
- Required BaF₂ grade or operating wavelength range
- Dimensions, thickness, and dimensional tolerances
- Polished surfaces, surface quality, and flatness requirements
- Coating requirements
- Required quantity