etching a negative of a desired multiple discrete level diffraction pattern onto {HEAD ~ a molding surface} of {TAIL ~ a quartz master element} using photolithography 
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etching a negative of a desired multiple discrete level diffraction pattern onto { HEAD ~ a molding surface } of { TAIL ~ a quartz master element } using photolithography
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH