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