About: http://webisa.webdatacommons.org/12421901

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	In order that the threshold power is comparable with the power available from commonly used light sources such as light-emitting semi-conductor diodes and laser diodes, the dimensions of the beam 1 must be small.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com