The SPIE Digital Library is the most extensive resource available on optics and photonics. Researchers have unprecedented access to 200,000 technical papers from SPIE Journals and Proceedings, including full coverage from 1990 to the present. New papers from SPIE Journals and Proceedings go online as they complete the necessary approvals and production. Print publications follow completion of the online volume. For e-First publications, the electronic version is the publication of record, and citation information indicates the online publication date. The SPIE Digital Library is part of Scitation, AIP’s secure, reliable, online publishing platform.