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Anti-reflection (AR) coatings are designed to reduce significantly the reflection of an optical component for desired range of wavelengths at desired range of incident angles.
Optida Co offers several types of AR coatings, having different structure and working spectral range: V-coatings, Multiwavelength, Broadband, Single layer or custom design acording your requirments. All these coatings are sensitive to incident angle and to polarization of the beam. In order to make the best possible solution, these parameters should be known prior to designing of the coating. The coating could be provided on customer substrates or our own.
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V-coatings consist of a pair of high and low refractive index dielectric layers and are designed to use with narrowband light beams. Typically, reflection is reduced down to 0.1-0.25% in a narrow spectral range around target wavelenght at normal incidence and down to 0.5% at AOI=450 incidence angle.
V-coatings are the perfect solution for various laser applications, where resistance to intensive laser radiation is important and minimum possible reflection should be achieved at specific wavelength.
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Multiwavelength AR coatings achieve very low reflection at two, three or more selected narrowband spectral ranges. Typically reflection does not exceed 0.5% for normal incidence for couple of different target wavelengths and could be a bit higher for other target wavelengths.
Typical example is AR coating for Nd:YAG laser applications which reduces reflectance down to 0.5% at 355 nm, 532nm and 1064 nm.
Other examples of multiwavelength AR coatings:
266+355 nm,
355+532 nm,
355+1064 nm,
532+1064 nm,
532+633 nm,
633+1064 nm,
808+1064 nm,
266+532+1064 nm, etc. |
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Broadband AR coatings usually consist of three or more dielectric layers and are suited for considerably wider spectral ranges, like 400-700 nm. Typically reflection is reduced down to 0.5 % - 1.5% at normal incidence depending on the selected spectral region, or to 1-2% at AOI=450 incidence.
Typical spectral ranges covered by these coatings at normal incidence are:
250-350 nm (R<1%),
350-900 nm (R<1.5%),
400-700 nm (R<0.5%),
400-800 nm (R<1.2%),
500-800 nm (R<0.5%),
700-1000 nm (R<0.7%),
800-1200 nm (R<0.7%),
1200-1600 (R<0.5%),
1200-2000 (R<0.7%).
Coatings could be optimized for average, S, P or both polarizations. |
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Single layer AR coatings are used for moderate supression of the reflectance down to 2.5% for a very broad spectral range, like 450-1100 nm at normal incidence.
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