In particular, {TAIL ~ Bessel beams} are light beams having {HEAD ~ properties} most similar to those of LG beams, however, currently known generating techniques can only generate approximate Bessel beams 
In particular , { TAIL ~ Bessel beams } are light beams having { HEAD ~ properties } most similar to those of LG beams , however , currently known generating techniques can only generate approximate Bessel beams
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH