large aperture laser
61Spatial filter — A spatial filter is an optical device which uses the principles of Fourier optics to alter the structure of a beam of coherent light or other electromagnetic radiation. Spatial filtering is commonly used to clean up the output of lasers, removing …
62Search for extraterrestrial intelligence — The search for extraterrestrial intelligence is sometimes abbreviated as SETI. For other uses, see SETI (disambiguation). Screen shot of the screensaver for SETI@home, a distributed computing project in which volunteers donate idle computer power …
63Holography — (from the Greek, ὅλος hólos whole + γραφή grafē writing, drawing) is a technique that allows the light scattered from an object to be recorded and later reconstructed so that it appears as if the object is in the same position relative to the… …
64Defence Research and Development Organisation — Sanskrit: बलस्य मूलं विज्ञानम् Strength s Origin is in Science [1] Agency overvi …
65Iron sight — Sight picture through iron sights of an H K MP5 submachine gun. The annular shroud around the front post sight is aligned with the rear peep sight to ensure the weapon is properly trained. Iron sights are a system of shaped alignment markers… …
66History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …
67Rhinoplasty — For the album by Primus, see Rhinoplasty (album). Rhinoplasty Intervention Rhinoplasty: The lower lateral cartilage (greater alar cartilage) exposed for plastic modification via the left nostril …
68Canon New F-1 — The Canon New F 1 replaced the F 1n (an upgraded F 1) as Canon s top of the line 35mm single lens reflex camera in 1981. Like the earlier models, the New F 1 takes FD mount lenses. Although no date has ever been confirmed, it is thought that the… …
69Carl Zeiss AG — Infobox Company name = Carl Zeiss AG type = Aktiengesellschaft foundation = Jena, Germany (1846) location = flagicon|GEROberkochen, Germany slogan = We make it visible key people = Dr. Dieter Kurz, CEO and President num employees = 12,844 (March… …
70radar — /ray dahr/, n. 1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. 2. a means or sense of awareness or… …
