An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the infrared, visible, ultraviolet, or X-ray regions of the spectrum
Optical wave guides -- Mathematics. : Numerical investigation of a trapezoidal cross-section ridge optical waveguide / Gong Yue-Jin, Lin De-Jun & Anthony D. Klemm
Opticians Act 1958 Great Britain : Opticians Bill : report on the consolidation of legislation relating to opticians / The Law Commission and the Scottish Law Commission
Opticians -- Legal status, laws, etc : Optometry : professional, economic, and legal aspects / by H.W. Hofstetter, Associate Professor of Optometry, The Ohio State University, Columbus, Ohio
Optics, Adaptive -- Industrial applications. : Adaptive optics for industry and medicine : proceedings of the 4th international workshop, Münster, Germany, Oct. 19-24, 2003 / U. Wittrock (ed.)
Optics and Photonics -- Congresses : Advances in biomedical photonics and imaging : proceedings of the 6th International Conference on Photonics and Imaging in Biology and Medicine (PIBM 2007), Wuhan, P.R. China, 4-6 November 2007 / editors, Qingming Luo, Lihong V. Wang, Valery V. Tuchin