Polycrystalline magnesium fluoride can be infrared polycrystalline or ultraviolet polycrystalline material, often used for protection windows or analytical instruments to transmit the signal of the lens, or coating target material. However, polycrystalline magnesium fluoride cannot be used as a lens because of its birefringent properties, which will produce two or more images when focused.

Magnesium fluoride is often used as achromatic bonded waveplates because of its birefringence property. Our magnesium fluoride is made of 4N grade raw material, specific growth and rejection process, and ultra-precise cutting and orientation process, which can reduce the difficulty of precision control in the manufacturing process of your wave sheet and the precision of phase delay in use more effectively.

Grain boundary stress is the stress acting on the grain boundary. On the grain boundary surface, the atomic arrangement transitions from one orientation to another, so the atomic arrangement at the grain boundary is in a transition state. The contact interface between the grain and the grain is called the grain boundary. Low stress magnesium fluoride refers to the maximum stress less than 15NM for magnesium fluoride with length greater than 40mm or less than 3NM for 2mm thickness. The low stress is directly related to the crystal growth process, annealing process, and post-processing and treatment.

Magnesium fluoride is widely used in excimer lasers of argon fluoride, krypton fluoride and xenon chloride because of its high transmission rate, long service life and low light energy loss. Theoretically and experimentally, it is proved that the more ultraviolet wavelength lasers have higher material requirements, which means that the magnesium fluoride materials used in these three wavelength lasers can be different. As the world’s leading supplier of magnesium fluoride crystals, we have a good understanding of the material requirements for excimer lasers at different wavelengths.

The extreme ultraviolet magnesium fluoride material must be high purity material, and the crystal growth process must be controlled by atmosphere to obtain higher transmittance, and because of the complexity of the photoion welding process, the crystal orientation, microstructure, lens processing and annealing requirements are extremely demanding. We are currently the world’s leading supplier of this product, specializing not only in materials but also in applications.

Magnesium fluoride is a tetragonal crystal system, characterized by each anisotropy. So it must be considered as single crystal in precision imaging and signal transmission.
The main dissociation plane of magnesium fluoride is 110, but the smallest birefringence is 001 plane. Single crystal means the direction is random, it may be 110,100,001 or other direction; this varies a lot in practical application. If the customer does not specify the direction, the intrinsic crystals are processed according to the direction.