About: http://webisa.webdatacommons.org/50150304

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	As is known in the art, Yb:YAG has an index of refraction n1 = 1.82 and Sapphire is a birefringent material having an average index of refraction n2 = 1.78.
http://www.w3.org/ns/prov#wasQuotedFrom	hypertextbook.com