Transmission Coeff of Window Glass vs Wavelength?

AI Thread Summary
Ordinary window glass transmits visible light but significantly blocks ultraviolet (UV) light, which is why tanning through a window is ineffective. Transmission below 250 nm is nearly nonexistent, while near-infrared wavelengths around 1000 nm are transmitted reasonably well. However, transmission coefficients for glass decrease sharply above 3 or 4 microns. The discussion highlights the varying transmission properties of glass across different wavelengths, emphasizing its limited UV transmission and better performance in the near-infrared range. Understanding these characteristics is crucial for applications involving light filtration and energy efficiency.
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Does anyone know how ordinary window glass behaves at different wavelengths? It obviously passes the optical band, but does it pass ultra violet and infrared wavelengths equally well? How about wavelengths above 1000nm? Below 250nm?
 
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Most glasses will transmit UV light very little. That's why you can't get a tan through a window. Below 250 nm, you'll probably see almost no transmission. From the transmission curves listed on http://www.sinclairmfg.com/datasheets/transmission.htm , it appears that the near infrared transmits reasonably well for most glasses, so 1000 nm light would probably be transmitted. Above 3 or 4 microns, it looks like the transmission coefficients drop off.

Edited by moderator, Nov. 2011 -- current working link:
http://www.sinclairmfg.com/datasheets/optical3.html
 
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