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Copper Vapor Laser
Copper vapor laser (CVL) uses vapors of copper as the lasing medium in a 4-level laser. It produces green laser light at 510.6 nm and yellow laser light at 578.2 nm. The pulse width is typically from 5 to 60 ns, and peak power from 50 to 5000 kW. Its pulse repetition frequencies can be 2 to 100 kHz. The ''average power'' of CVLs can range from 25 W to more than 2 kW. It is one of the lasers that can be home built. W.T. Walter et al. were first who received laser generation of the copper vapour lasers (Walter W.T., Piltch M., Solimene N., Gould G. Pulsed laser action in atomic copper vapor. Bull. Amer. Phys. Soc., 1966, vol. 11, no. 1, p. 113.). In 1971 A.A.Isaev, M.A.Kazaryan and G.G.Petrash have invented a self-heating concept which allowed to tremendously increase efficiency of the cooper vapor laser and start their industrial production. (Isaev A.A., Kazaryan M.A., Petrash G.G. Effective Pulsed Copper-vapor Laser with High Average Generation Po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Analytical Instruments
A scientific instrument is a device or tool used for scientific purposes, including the study of both natural phenomena and theoretical research. History Historically, the definition of a scientific instrument has varied, based on usage, laws, and historical time period. Before the mid-nineteentcenturysuch tools were referred to as "natural philosophical" or "philosophical" apparatus and instruments, and older tools from antiquity to the Middle Ages (such as the astrolabe and pendulum clock) defy a more modern definition of "a tool developed to investigate nature qualitatively or quantitatively." Scientific instruments were made by instrument makers living near a center of learning or research, such as a university or research laboratory. Instrument makers designed, constructed, and refined instruments for purposes, but if demand was sufficient, an instrument would go into production as a commercial product. In a description of the use of the eudiometer by Jan Ingenhousz to show p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Laser Types
This is a list of laser types, their operational wavelengths, and their applications. Thousands of kinds of laser are known, but most of them are used only for specialized research. Overview Gas lasers Chemical lasers Used as directed-energy weapons. Dye lasers Metal-vapor lasers Solid-state lasers Semiconductor lasers Other types of lasers See also *Laser construction *List of laser articles This is a list of laser topics. A * 3D printing, additive manufacturing * Abnormal reflection * Above-threshold ionization * Absorption spectroscopy * Accelerator physics * Acoustic microscopy * Acousto-optic deflector * Acousto-optic modul ... Notes Further references *Silfvast, William T. ''Laser fundamentals'', Cambridge University Press, 2004. *Weber, Marvin J. ''Handbook of laser wavelengths'', CRC Press, 1999. {{DEFAULTSORT:Laser Types ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Division Bell
''The Division Bell'' is the fourteenth studio album by the English progressive rock band Pink Floyd, released on 28 March 1994 by EMI Records in the United Kingdom and on 4 April by Columbia Records in the United States. The second Pink Floyd album recorded without founding member Roger Waters, ''The Division Bell'' was written mostly by guitarist and singer David Gilmour and keyboardist Richard Wright. It features Wright's first lead vocal on a Pink Floyd album since ''The Dark Side of the Moon'' (1973). Gilmour's fiancée, the novelist Polly Samson, co-wrote many of the lyrics, which deal with themes of communication. It was the last Pink Floyd studio album to be composed of entirely new material, and the last recorded with Wright, who died in 2008. Recording took place in locations including the band's Britannia Row Studios and Gilmour's houseboat, '' Astoria''. The production team included longtime Pink Floyd collaborators such as producer Bob Ezrin, engineer Andy Jacks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pink Floyd
Pink Floyd are an English rock band formed in London in 1965. Gaining an early following as one of the first British psychedelic music, psychedelic groups, they were distinguished by their extended compositions, sonic experimentation, philosophical lyrics and elaborate Pink Floyd live performances, live shows. They became a leading band of the progressive rock genre, cited by some as the greatest progressive rock band of all time. Pink Floyd were founded in 1965 by Syd Barrett (guitar, lead vocals), Nick Mason (drums), Roger Waters (bass guitar, vocals), and Richard Wright (musician), Richard Wright (keyboards, vocals). Under Barrett's leadership, they released two charting singles and the successful debut album ''The Piper at the Gates of Dawn'' (1967). Guitarist and vocalist David Gilmour joined in December 1967; Barrett left in April 1968 due to deteriorating mental health. Waters became the primary lyricist and thematic leader, devising the concept album, concepts behind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tel-Hai Academic College
Tel-Hai College is a college located in Tel Hai in northern Israel, near Kibbutz Kfar Giladi and north of Kiryat Shmona. The college offers academic and continuing education programs for approximately 4,500 students, 70 percent of whom come from outside the Galilee. Minorities comprise about 10 percent of the student body. The college offers degrees in life sciences, social sciences, computer science, and the humanities. The college sees itself as "an agent of social and economic development in the highly strategic Upper Galilee region." Because of its location at the country's farthest northern border, Tel Hai's mandate extends beyond the area of education to include opportunities for individual and community development and closing social and economic rifts. Many biology science professors who teach at Tel Hai have research groups at MIGAL where many students also develop their bachelor or master projects. Center for Learning Disabilities In 1995, Tel Hai College opened the C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dani Karavan
Daniel "Dani" Karavan ( he, דני קרוון, 7 December 1930 – 29 May 2021) was an Israeli sculptor best known for site specific memorials and monuments which merge into the environment. Biography Daniel (Dani) Karavan was born in Tel Aviv. His father Abraham was the chief landscape architect of Tel Aviv from the 1940s to the 1960s.Pixel-Delight Dani Karavan website accessed 4 January 2007. At the age of 13, he began studying painting. In 1943, he studied with in Tel Aviv and from 1943 to 1949 at the Bezalel School of Art in . After living on a |
Colin Webb
Colin Edward Webb (born 9 December 1937) is a British physicist and former professor at the University of Oxford, specialising in lasers. Education Webb was educated at the University of Nottingham (BSc) and Oriel College, Oxford (DPhil). Career After working at Bell Labs in Murray Hill, New Jersey, Webb returned to Oxford as a research fellow in physics at the Clarendon Laboratory in 1968, and was appointed to a university lectureship in 1971, becoming reader in 1990 and professor in 1992. He served as head of Atomic and Laser Physics from 1995 to 1999, and became an emeritus professor in 2002. Jesus College, Oxford appointed him to a Fellowship in 1973; he became a senior research fellow in 1988 and an emeritus fellow in 2005. Webb has supervised more than 35 DPhil students. In 1977, he founded Oxford Lasers a company that began as a manufacturer of high-power copper lasers and that today focuses on high-speed imaging and laser micro-machining technology. Research Webb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dye Laser
A dye laser is a laser that uses an organic dye as the lasing medium, usually as a liquid solution. Compared to gases and most solid state lasing media, a dye can usually be used for a much wider range of wavelengths, often spanning 50 to 100 nanometers or more. The wide bandwidth makes them particularly suitable for tunable lasers and pulsed lasers. The dye rhodamine 6G, for example, can be tuned from 635 nm (orangish-red) to 560 nm (greenish-yellow), and produce pulses as short as 16 femtoseconds. Moreover, the dye can be replaced by another type in order to generate an even broader range of wavelengths with the same laser, from the near-infrared to the near-ultraviolet, although this usually requires replacing other optical components in the laser as well, such as dielectric mirrors or pump lasers. Dye lasers were independently discovered by P. P. Sorokin and F. P. Schäfer (and colleagues) in 1966. In addition to the usual liquid state, dye lasers are also availa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isotope Separation
Isotope separation is the process of concentrating specific isotopes of a chemical element by removing other isotopes. The use of the nuclides produced is varied. The largest variety is used in research (e.g. in chemistry where atoms of "marker" nuclide are used to figure out reaction mechanisms). By tonnage, separating natural uranium into enriched uranium and depleted uranium is the largest application. In the following text, mainly the uranium enrichment is considered. This process is crucial in the manufacture of uranium fuel for nuclear power plants, and is also required for the creation of uranium-based nuclear weapons. Plutonium-based weapons use plutonium produced in a nuclear reactor, which must be operated in such a way as to produce plutonium already of suitable isotopic mix or ''grade''. While different chemical elements can be purified through chemical reaction, chemical processes, isotopes of the same element have nearly identical chemical properties, which makes this ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AVLIS
Atomic vapor laser isotope separation, or AVLIS, is a method by which specially tuned lasers are used to separate isotopes of uranium using selective ionization of hyperfine transitions. A similar technology, using molecules instead of atoms, is molecular laser isotope separation (MLIS). Natural uranium consists of a large mass of 238U and a much smaller mass of fissile 235U. Traditionally, the 235U is separated from the mass by dissolving it in acid to produce uranium hexafluoride and then using gas centrifuges to separate the isotopes. Each trip through the centrifuge "enriches" the amount of 235U and leaves behind depleted uranium. In contrast, AVLIS produces much higher enrichment in a single step without the need to mix it with acid. The technology could, in principle, also be used for isotope separation of other elements, which is uneconomic outside specialist applications with current non-laser-based technologies for most elements. As the process does not require the feed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laser Cutting
Laser cutting is a technology that uses a laser to vaporize materials, resulting in a cut edge. While typically used for industrial manufacturing applications, it is now used by schools, small businesses, architecture, and hobbyists. Laser cutting works by directing the output of a high-power laser most commonly through optics. The laser optics and CNC (computer numerical control) is used to direct the laser beam to the material. A commercial laser for cutting materials uses a motion control system to follow a CNC or G-code of the pattern to be cut onto the material. The focused laser beam is directed at the material, which then either melts, burns, vaporizes away, or is blown away by a jet of gas, leaving an edge with a high-quality surface finish. History In 1965, the first production laser cutting machine was used to drilling, drill holes in diamond Die (manufacturing), dies. This machine was made by the Western Electric Engineering Research Center. In 1967, the British pi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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