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Gisela Eckhardt
Gisela Eckhardt (28 October 1926 – 30 January 2020) was a German physicist and co-developer of the Raman laser. Early years Eckhardt grew up as a child of a Frankfurt electrical wholesaler, who died when she was only 13 years old. She became interested in physics at the age of 12 while at the Wöhler School in Frankfurt. After graduation she studied physics at the Johann Wolfgang Goethe University Frankfurt am Main. She graduated in 1952 with a diploma, with a diploma thesis on the extension of the scope of Christiansen filters to the infrared. In 1958 she received her doctorate. Career She then went to the United States together with her husband Wilfried, who also received his PhD in physics shortly before. There, they first worked for the electronics group RCA, where they had to go to another laboratory of the group, since married couples were not hired there at the time. While her husband was in Princeton's main lab, she was in the semiconductor lab in Somerville, at a s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frankfurt
Frankfurt, officially Frankfurt am Main (; Hessian: , " Frank ford on the Main"), is the most populous city in the German state of Hesse. Its 791,000 inhabitants as of 2022 make it the fifth-most populous city in Germany. Located on its namesake Main River, it forms a continuous conurbation with the neighboring city of Offenbach am Main and its urban area has a population of over 2.3 million. The city is the heart of the larger Rhine-Main metropolitan region, which has a population of more than 5.6 million and is Germany's second-largest metropolitan region after the Rhine-Ruhr region. Frankfurt's central business district, the Bankenviertel, lies about northwest of the geographic center of the EU at Gadheim, Lower Franconia. Like France and Franconia, the city is named after the Franks. Frankfurt is the largest city in the Rhine Franconian dialect area. Frankfurt was a city state, the Free City of Frankfurt, for nearly five centuries, and was one of the mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Power Electronics
Power electronics is the application of electronics to the control and conversion of electric power. The first high-power electronic devices were made using mercury-arc valves. In modern systems, the conversion is performed with semiconductor switching devices such as diodes, thyristors, and power transistors such as the power MOSFET and IGBT. In contrast to electronic systems concerned with the transmission and processing of signals and data, substantial amounts of electrical energy are processed in power electronics. An AC/DC converter (rectifier) is the most typical power electronics device found in many consumer electronic devices, e.g. television sets, personal computers, battery chargers, etc. The power range is typically from tens of watts to several hundred watts. In industry, a common application is the variable speed drive (VSD) that is used to control an induction motor. The power range of VSDs starts from a few hundred watts and ends at tens of megawatts. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Women Physicists
German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law ** Germanic peoples (Roman times) * German language **any of the Germanic languages * German cuisine, traditional foods of Germany People * German (given name) * German (surname) * Germán, a Spanish name Places * German (parish), Isle of Man * German, Albania, or Gërmej * German, Bulgaria * German, Iran * German, North Macedonia * German, New York, U.S. * Agios Germanos, Greece Other uses * German (mythology), a South Slavic mythological being * Germans (band), a Canadian rock band * "German" (song), a 2019 song by No Money Enterprise * '' The German'', a 2008 short film * " The Germans", an episode of ''Fawlty Towers'' * ''The German'', a nickname for Congolese rebel André Kisase Ngandu See also * Germanic (disambigu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2020 Deaths
This is a list of deaths of notable people, organised by year. New deaths articles are added to their respective month (e.g., Deaths in ) and then linked here. 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 See also * Lists of deaths by day * Deaths by year {{DEFAULTSORT:deaths by year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1926 Births
Events January * January 3 – Theodoros Pangalos declares himself dictator in Greece. * January 8 **Abdul-Aziz ibn Saud is crowned King of Hejaz. ** Crown Prince Nguyễn Phúc Vĩnh Thuy ascends the throne, the last monarch of Vietnam. * January 12 – Freeman Gosden and Charles Correll premiere their radio program ''Sam 'n' Henry'', in which the two white performers portray two black characters from Harlem looking to strike it rich in the big city (it is a precursor to Gosden and Correll's more popular later program, ''Amos 'n' Andy''). * January 16 – A BBC comic radio play broadcast by Ronald Knox, about a workers' revolution, causes a panic in London. * January 21 – The Belgian Parliament accepts the Locarno Treaties. * January 26 – Scottish inventor John Logie Baird demonstrates a mechanical television system at his London laboratory for members of the Royal Institution and a reporter from ''The Times''. * January 29 – Eugene O'Neill's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Applied Physics A
''Applied Physics A: Materials Science and Processing'' is a peer-reviewed scientific journal that is published monthly by Springer Science+Business Media. The editor-in-chief is Thomas Lippert ( Paul Scherrer Institute). This publication is complemented by ''Applied Physics B (Lasers & Optics)''. History The journal ''Applied Physics'' was originally conceived and founded in 1972 by Helmut K.V. Lotsch at Springer-Verlag Berlin Heidelberg New York.Heinz Götze: der Springer-Verlag: Stationen seiner Geschichte, Teil 2: 1945-1992, Springer, 2008, S.331 Lotsch edited the journal up to volume 25 and split it thereafter into the two part A26(Solids and Surfaces) and B26(Photophysics and Laser Chemistry). He continued his editorship up to the volumes A61 and B61. Starting in 1995 the two journals were continued under separate editorships. Aims and scope Applied Physics A journal covers theoretical and experimental research in applied physics, including surfaces, thin films, the conde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Q-switch
Q-switching, sometimes known as giant pulse formation or Q-spoiling, is a technique by which a laser can be made to produce a pulsed output beam. The technique allows the production of light pulses with extremely high (gigawatt) peak power, much higher than would be produced by the same laser if it were operating in a continuous wave (constant output) mode. Compared to modelocking, another technique for pulse generation with lasers, Q-switching leads to much lower pulse repetition rates, much higher pulse energies, and much longer pulse durations. The two techniques are sometimes applied together. Q-switching was first proposed in 1958 by Gordon Gould, p. 93. and independently discovered and demonstrated in 1961 or 1962 by R.W. Hellwarth and F.J. McClung at Hughes Research Laboratories using electrically switched Kerr cell shutters in a ruby laser. Optical nonlinearities such as Q-switching were fully explained by Nicolaas Bloembergen, who won the Nobel prize in 1981 for this ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malibu, California
Malibu ( ; es, Malibú; Chumash: ) is a beach city in the Santa Monica Mountains region of Los Angeles County, California, situated about west of Downtown Los Angeles. It is known for its Mediterranean climate and its strip of the Malibu coast, incorporated in 1991 into the City of Malibu. The exclusive Malibu Colony has been historically home to Hollywood celebrities. People in the entertainment industry and other affluent residents live throughout the city, yet many residents are middle class. Most Malibu residents live from a half-mile (0.8 km) to within a few hundred yards of Pacific Coast Highway (State Route 1), which traverses the city, with some residents living up to one mile (1.6 km) away from the beach up narrow canyons. As of the 2020 census, the city population was 10,654. Nicknamed "the 'Bu" by surfers and locals, beaches along the Malibu coast include: Topanga Beach, Big Rock Beach, Las Flores Beach, La Costa Beach, Surfrider Beach, Dan Blocker Beach, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ruby Laser
A ruby laser is a solid-state laser that uses a synthetic ruby crystal as its gain medium. The first working laser was a ruby laser made by Theodore H. "Ted" Maiman at Hughes Research Laboratories on May 16, 1960. Ruby lasers produce pulses of coherent visible light at a wavelength of 694.3 nm, which is a deep red color. Typical ruby laser pulse lengths are on the order of a millisecond. Design A ruby laser most often consists of a ruby rod that must be pumped with very high energy, usually from a flashtube, to achieve a population inversion. The rod is often placed between two mirrors, forming an optical cavity, which oscillate the light produced by the ruby's fluorescence, causing stimulated emission. Ruby is one of the few solid state lasers that produce light in the visible range of the spectrum, lasing at 694.3 nanometers, in a deep red color, with a very narrow linewidth of 0.53 nm.''Principles of Lasers'' By Orazio Svelto – Plenum Press 1976 Page 367–37 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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