SPIE Digital Library Society of Photo-Optical Instrumentation Engineers' journals and proceedings; covers optics, photonics, medical imaging, and many areas of nanotechnology, including MEMS. Provides access to 200,000 technical papers from SPIE Journals and Conference Proceedings from 1990 to the present. More than 17,000 new technical papers are added annually. The Proceedings of SPIE comprise nearly 6000 volumes from conferences sponsored or cosponsored by SPIE since 1963. The SPIE Digital Library includes Proceedings from 1990 to the present, beginning with Volume 1200, with more than 17,000 new technical papers added.