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Unformatted text preview: Interference Filter Selection and Operation An interference filter consists of a "one-half-wavelength" thick resonant layer of refractive index n sandwiched between two relatively thick slabs each of refractive index n1 . Two interference filters are available for a particular application. The first is specified to pass 600 nm wavelength light at normal incidence. The second is specified to pass 650 nm wavelength light at normal incidence. By selecting one of these filters and by rotating the filter such that the angle of incidence, , is increased (as shown in the figure), it is desired to pass only red 632.8 nm wavelength light from a helium-neon laser. The "one-half-wavelength" thick layer has a refractive index of n = 1.500. The surrounding regions have a refractive index of n1 = 1.550. Determine, showing all work, which interference filter should be used to pass 632.8 nm light. Calculate, showing all work, the required angular rotation in degrees as measured in air that is required. Calculate, showing all work, the thickness of the "one-half-wavelength" thick region of the interference filter used. Express all of your answers accurately to four significant figures. Put your final answers in the space provided. The normal-incident pass wavelength of the interference filter to be used = nm Angle of incidence to pass above wavelength = Thickness of "one-half-wavelength" center region = nm ...
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This note was uploaded on 04/29/2008 for the course ECE 4500 taught by Professor Gaylord during the Spring '08 term at Georgia Tech.
- Spring '08