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Yttrium alumate (YVO4) is an excellent birefringent crystal material, which is a negative uniaxial crystal. The crystal has good physical and mechanical properties, wide light transmission range, high transmittance, large birefringence coefficient and easy processing. YVO4 crystal can replace ice SPAR and crystal red stone in the field of optical fiber communication, is the key material in optical communication passive devices such as optical isolators, circulators, polarization splitters, polarizers.
Caicite Crystal is a kind of natural birefringent material, in the shape of diamond, birefringence coefficient is large, through the spectrum is wide, from visible to near infrared has relatively good optical properties. Although the mechanical strength of Iceland SPAR material is soft and easy to scratch, it still does not affect its wide application in polarization devices. Caicite is mainly used in Glan POLARIZER.
LiNbO3 is widely used in optical fiber communication as a birefringent crystal. The crystal has good physical and mechanical properties, wide light transmission range, high transmittance, easy processing, and lower material cost than other materials. Lithium niobate crystals are widely used in passive optical communication devices such as optical isolators, circulators, polarization splitters, polarizers, etc
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Mirror
Dielectric mirrors are usually more sensitive to the incidence Angle, and the default incidence Angle of dielectric Mirrors is 45° if not specified. Dielectric Mirrors are usually divided into: Laser mirrors, Broadband Mirrors, Ultra-Broadband Mirrors. Compared with Metal mirrors, Dielectric Mirrors have the advantages of high reflectance and high damage threshold. Main application areas: anti-high power laser reflection system of stage laser lamp, high precision optical instrument, etc.
In the near infrared, it has a very high reflectivity, and the average reflectivity Ravg is >96% in the range of 800-2000um.Because the gold film is relatively soft and easy to scratch, the outermost layer of these Mirrors is Coating with a 100nm thick SiO2 film.
In the visible to near infrared has a very high reflectivity, in the range of 450-2000um the average reflectivity Ravg>97.5%, it is the highest reflectivity of all metal mirrors, while in the band range of 2-20um has a high reflectivity, Ravg>96%.Because the silver film is soft and easy to scratch and oxidize, the outermost layer of these mirrors is plated with a 100nm thick SiO2 film, but it is still necessary to avoid a high humidity environment during use, and the wiping needs to be more careful. Due to their high reflectivity in the 450 nm-20 µm range, these mirrors are well suited for use in femtosecond lasers.
The coating of MgF2 protective layer on the outer layer of Aluminum Mirror enhances the reflectance of ultraviolet band, and has more than 90% reflectance in the wavelength range of 250-450nm. And the protective layer of MgF2 can also protect the strength of the aluminum film and extend the service life of the Mirror.
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