About: http://webisa.webdatacommons.org/45257910

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	However, in some cases such as laser beams from unstable resonators, the beam apertures are annulus or a holed-rectangle.
http://www.w3.org/ns/prov#wasQuotedFrom	opticsinfobase.org