Barium Fluoride(BaF2) Dome
Barium fluoride (BaF2) crystals belong to the cubic crystal system, good moisture resistance, melting point of 1280°C, high operating temperature, refractive index in a wide range of wavelengths does not change much, wide range of light transmission, in the 0.2μm to 10μm wavelength range can reach more than 90%, but the mechanical strength is poor Mohs hardness of 87. In the aircraft guidance head or EO/IR platform, can be made into a dome The spheres can be made into spheres for aircraft guidance heads or EO/IR platforms.
Low stress or delayed calcium fluoride
Low stress and low delay are often positively correlated, with low stress representing a more uniform and homogeneous material, but with differences in crystal orientation, which can lead to differences in delay during multiple round trips or long distance transport. To obtain this material requires a consistent process of control of the raw material, crystal growth, crystal cutting and processing, crystal ultra-precision annealing, crystal grinding and polishing to remove as much internal thermal and external mechanical stress as possible, so that a maximum stress of 15 NM is involved.
Non-fluorescent(Raman) Calcium Fluoride
Calcium fluoride itself is also called fluorite, so non-fluorescence is only a relative concept, while most are also called Raman grade calcium fluoride, and the wavelength of the material applied and the laser energy are directly related, for example, 450NM non-fluorescence does not mean 355NM non-fluorescence, 2W laser non-fluorescence does not mean 5W laser non-fluorescence. Fluorescence can cause strong absorption, resulting in energy loss, signal distortion or imaging disturbances. Fluorescence is produced on the one hand by the elemental composition of the crystal material itself and also by defects created during the growth of the material. Therefore, fluorescent products are either selected materials or custom-made products, which are monitored by fluorescence spectrometers, energy spectrometers or extreme ultraviolet irradiation and are relatively expensive.
Large size Calcium Fluoride
Calcium fluoride is used for the development or bulk requirements of polycrystalline materials over 150 mm and single crystals over 120 mm.
These products are mostly used in astronomical observation, high-altitude imaging, satellite communications, public safety and high-energy laser transmission.
They require high stress and uniformity in the material itself, as well as high precision in the processing of the material, and are mostly recommended for CNC or DTM processing.
If openings and special shapes are involved, it is recommended to provide requirements for material stress.
UV vacuum Calcium Fluoride
It should be used in the wavelength range 130-200NM, sometimes up to 110NM.
The material is mostly used in UV spectral analysis and in KF/CF vacuum windows, requiring high transmittance and good irradiation resistance below 200NM.
Vacuum grade calcium fluoride requires high purity of the raw material and control of the mixing of other elements in the crystal growth process, and try to improve the transmittance below 200 NM.
Excimer Calcium Fluoride
for use on lasers in the 193/248/366NM wavelength band.
Can be used as a laser light source, lighting equipment and imaging equipment, where the light source requirements mainly require high internal transmittance, no colour core, laser damage threshold to be good, so that the life of the light source can be greatly extended; laser external light path system on the material uniformity and consistency requirements are higher, at the same time because of the ultra-precision characteristics of the workpiece, the material often requires precision annealing, all the excimer grade materials are All excimer grade materials are custom-made products, which are the high-end products in calcium fluoride materials.
Calcium fluoride belongs to the cubic crystal system of the high-grade crystal family and is typically isotropic.
However, this is often only theoretical. In practical applications in complex and high-precision optoelectronic systems or for high-power laser purposes,
or in applications such as gyroscopes and high-precision microscope lenses, calcium fluoride in specific orientations is often the preferred solution for optical designers and applicators,
based on the nuances of the material and the cumulative errors in material processing.