About: http://webisa.webdatacommons.org/89289207

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	A filtered arc-type lamp traversing a pin hole is a relatively weak source of coherent light so that the most obvious source of coherent light is a laser.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com