Dispersive Filter
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United States of America Patent
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Issued Date -
Feb 12, 2009
app pub date -
Aug 7, 2007
filing date -
Aug 7, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A dispersive filter includes two dispersion systems with an intermediate slit between them. The two dispersion systems have similar but mirror image dispersion characteristics at the plane of the intermediate slit and are configured so that the entrance port of the dispersive filter is polychromatically imaged on the exit port. The intermediate slit passes blocks selected wavelengths and transmits the remaining dispersed wavelengths from the first dispersion system to the second dispersion system. The second dispersion system combines the dispersed beam that passes through the intermediate slit to form an output beam, which is focused on the exit port. In this manner, the radiance of the input radiation is preserved ignoring losses caused by the optical elements and the blocked wavelengths.
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