About: http://webisa.webdatacommons.org/5261648

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, when using a semiconductor material, such as silicon or CdS, the grating period is preferably less than half the wavelength of the incident beam 11.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com