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Dielectric mirror
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<p>A dielectric mirror, also known as a Bragg mirror, is a type of <a href="/facts/Mirror/wMu4u6BB">mirror</a> composed of multiple <a href="/facts/Thin_film/nSeoUT4Q">thin layers</a> of <a href="/facts/Dielectric/PnVt9P2G">dielectric</a> material, typically deposited on a substrate of <a href="/facts/Glass/hezRsAGf">glass</a> or some other optical material. By careful choice of the type and thickness of the dielectric layers, one can design an <a href="/facts/Optical_coating/pGnrNRn6">optical coating</a> with specified reflectivity at different <a href="/facts/Wavelength/kcJU0ymz">wavelengths</a> of <a href="/facts/Light/jeofpMn4">light</a>. Dielectric mirrors are also used to produce ultra-high reflectivity mirrors: values of 99.999% or better over a narrow range of wavelengths can be produced using special techniques. Alternatively, they can be made to reflect a broad <a href="/facts/Spectrum/wPUjkpqI">spectrum</a> of light, such as the entire visible range or the spectrum of the <a href="/facts/Ti-sapphire_laser/pUWECwSc">Ti-sapphire laser</a>. </p><p>Dielectric mirrors are very common in <a href="/facts/Optics/p0vq4S1T">optics</a> experiments, due to improved techniques that allow inexpensive manufacture of high-quality mirrors. Examples of their applications include <a href="/facts/Laser/jk6PTvvT">laser</a> <a href="/facts/Optical_cavity/BITPG3ga">cavity</a> end mirrors, <a href="/facts/Hot_mirror/WE137Wzc">hot</a> and <a href="/facts/Cold_mirror/jrPj4fMx">cold mirrors</a>, thin-film <a href="/facts/Beam_splitter/3PFoofER">beamsplitters</a>, high <a href="/facts/Laser_damage_threshold/cgBMrNg3">damage threshold</a> mirrors, and the coatings on modern <a href="/facts/Mirrored_sunglasses/mBXDTAmn">mirrorshades</a> and some <a href="/facts/Binoculars/DPHVmKIL">binoculars roof prism systems</a>. </p>