Custom phase plate
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United States of America Patent
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Sep 20, 2011
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N/A
app pub date -
Sep 4, 2008
filing date -
Sep 4, 2008
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Abstract
A custom phase plate for a light beam of wavelength '.lamda.' includes a sheet of plastic material having a base refractive index 'n.sub.o'. Formed onto a surface of the sheet is a plurality of contiguous spots having different refractive indices. Together, the spots establish a diffraction pattern in a light beam that removes optical aberrations from the beam. Specifically, each spot has a selected Optical Path Difference (OPD) relative to the base index (n.sub.o) that is equal to k.lamda./10 (for k=1 to 10). Further, the OPD for each spot in the pattern is individually established by heating the plastic material with a laser beam of ultra-short pulses.
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