This invention relates to a compound
potassium fluoroiodate and a linear birefringent optical
crystal of
potassium fluoroiodate, as well as their preparation methods and uses. The
chemical formula of the compound is KI4O. 10 F, with a molecular weight of 725.70, was prepared by hydrothermal or
room temperature solution methods. This compound belongs to the
triclinic crystal system,
space group P1(_), with
cell parameters a=7.1685(3) Å, b=7.4967(3) Å, and c=10.9225(4) Å. α =102.823(1)°, β =90.704(1)°, gamma =114.431(1)°, Z =2, V=517.50(4)Å 3 The
crystal is grown using a hydrothermal method or a room-temperature solution method. It has a low
ultraviolet cutoff edge and a large
birefringence of 0.133@1064nm. Its excellent performance and good
chemical stability make it suitable for fabricating polarizing prisms, phase
delay devices, and electro-optic modulation devices for various applications, such as Glan prisms, polarization
beam splitters, compensators, optical isolators, circulators, and optical modulators. It plays an important role in the fields of
optics and communications.