standard wavemeter
1Essen, Louis — ▪ 1998 British physicist (b. Sept. 6, 1908, Nottingham, Nottinghamshire, Eng. d. Aug. 24, 1997, Great Bookham, Surrey, Eng.), built the cesium beam atomic clock, a device that ultimately changed the way time is measured. Atomic clocks… …
2Louis Essen — Infobox Scientist name = Louis Essen box width = image width =150px caption = Louis Essen (left center) with Udo Adelsberger (extreme left) birth date = September 6, 1908 birth place = Nottingham death date = August 24, 1997 death place = Great… …
3Speed of light — The speed of light in the vacuum of free space is an important physical constant usually denoted by the letter c . [NIST and BIPM practice is to use c 0 for the speed of light in vacuum in accord with international standard ISO 31 5. See… …
4Fabry-Pérot interferometer — In optics, a Fabry Pérot interferometer or etalon is typically made of a transparent plate with two reflecting surfaces, or two parallel highly reflecting mirrors. (Technically the former is an etalon and the latter is an interferometer, but the… …
5Fabry–Pérot interferometer — Étalon redirects here. For the commune in Somme, France, see Étalon, Somme. Interference fringes, showing fine structure, from a Fabry–Pérot etalon. The source is a cooled deuterium lamp. In optics, a Fabry–Pérot interferometer or etalon is typic …
