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Photonics Handbook®
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ARTICLE OF THE HOUR Bandpass Filters
The Transistor’s Optical Cousin
Bandpass filters are passive optical devices that control the flow of light, much as transistors control electricity but are active devices. They can be used either to isolate certain wavelengths or colors, or to control the wavelengths reaching a detector. Applications range from detecting the gaseous composition of a distant star to determining the chemical activity in a human cell. In their earliest form, bandpass filters were constructed of absorbing media in a solute, such as water or...

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