Transmissivity of glass

Transmission. The spectral transmission of glass is determiaed by reflectioa at the glass surfaces and the optical absorption within the glass. Overall transmission of a flat sample at a particular wavelength is equal to (1 — R), where P is the absorption coefficient, t the thickness of glass, and... 

Abstract The principles of coatings to either enhance reflectivity of mirrors or to enhance transmission of glass optics are described. Then the ion assisted deposition and ion beam sputtering techniques are addressed. Performances of these technique-sand their limitations are illustrated with the characteristics of the VIRGO mirrors coated at LMA. The importance of metrology is emphasized. 

Figure 17. Chronology of improvement in light transmission of glasses over periods of history leading to introduction of photonics technology in the information age. Polymer protection of glass surfaces is an essential present feature.

Krogerus VE, Nieminen Elna, Savolainen UM. Light transmission of glass containers used in pharmacy. Farm Aikak 1970 79 101-107. 

For an air/glass interface, tan 0b = n, the refractive index of glass. In a gas laser, the light must be reflected back and forth between mirrors and through the gas container hundreds of times. Each time the beam passes through the cavity, it must pass through transparent windows at the ends of the gas container (Figure 18.10b), and it is clearly important that this transmission be as efficient as possible. 

Optical connectors ate used to terminate and interconnect fiber optic cables (see Fiber OPTICS). Transmission of information by light through optical fibers made of glass or plastic is less expensive in many cases than transmission of electric signals through wire. An advantage of fiber optic technology is that it is... 

When a substance is transparent to visible light, such as single crystals of simple inorganic solids which do not contain uansition metal ions, or some glasses, anotlier significant component in the thermal conductivity is the transmission of photons in the infra-red region, which becomes more important with... 

Yet another alternative is the thin-film solar cell. This cannot use silicon, because the transmission of solar radiation through silicon is high enough to require relatively thick silicon layers. One current favourite is the Cu(Ga, InjSci thin-film solar cell, with an efficiency up to 17% in small experimental cells. This material has a very high light absorption and the total thickness of the active layer (on a glass substrate) is only 2 pm. 

Detailed information on the emission characteristics of various sources and the transmission properties of glasses and filter solutions can be found in A J. Gordon and R. A. Ford, The Chemist s Companion, Wiley-Interscience, New York, 1972, pp. 348-368 and in S. L. Murov, I. Carmichael, and G. L. Hug, Handbook of Photochemistry, 2nd ed., Marcel Dekker, New Vbrk, 1993. 

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