{TAIL ~ The second diffractive structure} may be adapted to output light having {HEAD ~ corkscrew wave} 
{ TAIL ~ The second diffractive structure } may be adapted to output light having { HEAD ~ corkscrew wave }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD