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Home > Products > Mirrors > Dielectric HR Mirrors
Cylindrical Concave Dielectric Mirrors
Dielectric mirrors are made by alternately depositing two dielectric materials with different refractive indices (e.g., SiO₂/Ta₂O₅ or SiO₂/Nb₂O₅), with the optical thickness of each layer being 1/4 of a specific wavelength (λ.) When light is reflected multiple times at these interfaces, the light of a specific wavelength is reflected efficiently due to the interferometric phase length effect.
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What are the advantages of dielectric coating?
High reflectivity: in the designed wavelength range, the reflectivity can exceed 99.9%, much higher than metallic mirrors (usually 90%~98%).
Low absorption loss: the dielectric coating is virtually non-absorbing, making it suitable for high power laser applications.
What are the disadvantages of dielectric coating?
The reflection characteristics vary with the angle of incidence, and a large angle of incidence may result in a shift in the center wavelength.
High reflectivity: in the designed wavelength range, the reflectivity can exceed 99.9%, much higher than metallic mirrors (usually 90%~98%).
Low absorption loss: the dielectric coating is virtually non-absorbing, making it suitable for high power laser applications.
What are the disadvantages of dielectric coating?
The reflection characteristics vary with the angle of incidence, and a large angle of incidence may result in a shift in the center wavelength.
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