Non-planar optical diffraction grating having an arbitrary parallel groove profile
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United States of America Patent
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Jun 1, 2010
Grant Date -
Jan 4, 2007
app pub date -
Jul 1, 2005
filing date -
Jul 1, 2005
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Abstract
An optical diffraction grating having a superior ultra-precise non-planar surface shape desired in extremely sensitive and complex optical imaging devices (e.g. spectrometers or hyperspectral imagers) is provided. The optical diffraction grating comprises a substrate having a plurality of substantially parallel grooves, wherein each of the grooves includes a plurality of substantially parallel sub-grooves. A non-planar substrate surface shape is defined by a combination of the grooves. A groove profile is defined by a combination of the sub-grooves within a corresponding one of the grooves. In a preferred method of manufacturing the optical diffraction grating, a rotating spindle technique would be employed.
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