|
Chen Chuangtian
Chen Chuangtian (; 18 February 1937 – 31 October 2018), also known as Chuang-Tian Chen, was a Chinese materials scientist and physical chemist who specialized in crystals used in lasers. He discovered the nonlinear optical crystals BBO, LBO and KBBF, which have important uses in areas including superconductor research, semiconductor photolithography, and the medical industry. He was an academician of the Chinese Academy of Sciences and a fellow of The World Academy of Sciences. He was awarded the TWAS Prize in Chemistry, the State Technological Invention Award (First Class), and the Laudise Prize. Biography Chen was born on 18 February 1937 in Fenghua, Zhejiang, China. He studied at Shenyang No. 2 High School, and was accepted by the Department of Physics of Peking University in August 1956. After graduating in 1962, he entered the Fujian Institute of Research on the Structure of Matter in Fuzhou on the recommendation of Hu Ning, and studied under physical chemist Lu Ji ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chen (surname)
Chen () () is a common Chinese-language surname and one of the most common surnames in Asia. It is the most common surname in Taiwan (2010) and Singapore (2000). Chen is also the most common family name in Guangdong, Zhejiang, Fujian, Macau, and Hong Kong. It is the most common surname in Xiamen, the ancestral hometown of many overseas Hoklo. Chen was listed 10th in the ''Hundred Family Surnames'' poem, in the verse 馮陳褚衛 (Feng Chen Chu Wei). In Cantonese, it is usually romanized as Chan (as in Jackie Chan), most widely used by those from Hong Kong. Chan is also widely used in Macao and Malaysia. It is also sometimes spelled Chun. In many Southern Min dialects (including dialects of Hainan, Fujian, and Taiwan), the name is pronounced Tan, while in Teochew, it is pronounced Tang. In Hakka and Taishanese, the name is spelled Chin. In Wu it is pronounced Zen or Tchen. In Vietnam, this surname is written as Trần (in Quốc Ngữ) and is 2nd most common. In Thailand, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liang Jingkui
Liang Jingkui (; 28 April 1931 – 19 January 2019), also known as Jing-Kui Liang, was a Chinese physical chemist and materials scientist. He was a professor at the Institute of Physics, Chinese Academy of Sciences (CAS). He served as President of the CAS Fujian Institute of Research on the Structure of Matter from 1983 to 1987, and was elected an academician of the CAS in 1993. He was awarded the Ho Leung Ho Lee Prize in Technological Sciences in 1999 for his contributions to crystallography, solid-state physics, and materials science. Biography Liang was born in Fuzhou, Fujian, on 28 April 1931, the son of a power plant worker at the Fuzhou Electric Company. He was able to receive an education thanks to a scholarship offered by his father's employer. He entered Fuzhou University in 1951, and two years later transferred to Xiamen University, graduating with a bachelor's degree in physical chemistry in July 1955. He joined the Communist Party of China in June 1954. After study ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lithium Triborate
Lithium triborate (LiB3O5) or LBO is a non-linear optics crystal. It has a wide transparency range, moderately high nonlinear coupling, high damage threshold and desirable chemical and mechanical properties. This crystal is often used for second harmonic generation (SHG, also known as ''frequency doubling''), for example of Nd:YAG lasers (1064 nm → 532 nm). LBO can be both critically and non-critically phase-matched. In the latter case the crystal has to be heated or cooled depending on the wavelength. Lithium triborate was discovered and developed by Chen Chuangtian and others of the Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences. It has been patented. Chemical properties *Point group: mm2 *Lattice parameters: ''a''=8.4473 Å, ''b''=7.3788 Å, ''c''=5.1395 Å *Mohs hardness: 6 *Transmission range: 0.16 – 2.6 μm * Damage threshold: 25 J/cm2 (1064 nm, 10 ns pulses) *Thermal expansion coefficients: ''x'': 10.8×10−5 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beta Barium Borate
Barium borate is an inorganic compound, a borate of barium with a chemical formula BaB2O4 or Ba(BO2)2. It is available as a hydrate or dehydrated form, as white powder or colorless crystals. The crystals exist in the high-temperature α phase and low-temperature β phase, abbreviated as BBO; both phases are birefringent, and BBO is a common nonlinear optical material. Barium borate was discovered and developed by Chen Chuangtian and others of the Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences. Properties Barium borate exists in three major crystalline forms: alpha, beta, and gamma. The low-temperature beta phase converts into the alpha phase upon heating to 925 °C. β-Barium borate (BBO) differs from the α form by the positions of the barium ions within the crystal. Both phases are birefringent, however the α phase possesses centric symmetry and thus does not have the same nonlinear properties as the β phase. Alpha barium bo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diode-pumped Solid-state Laser
A diode-pumped solid-state laser (DPSSL) is a solid-state laser made by pumping a solid gain medium, for example, a ruby or a neodymium-doped YAG crystal, with a laser diode. DPSSLs have advantages in compactness and efficiency over other types, and high power DPSSLs have replaced ion lasers and flashlamp-pumped lasers in many scientific applications, and are now appearing commonly in green and other color laser pointers. Coupling The wavelength of laser diodes is tuned by means of temperature to produce an optimal compromise between the absorption coefficient in the crystal and energy efficiency (lowest possible pump photon energy). As waste energy is limited by the thermal lens this means higher power densities compared to high-intensity discharge lamps. High power lasers use a single crystal, but many laser diodes are arranged in strips (multiple diodes next to each other in one substrate) or stacks (stacks of substrates). This diode grid can be imaged onto the crystal by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deep Ultraviolet
Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency around 30 PHz) to 400 nm (750 THz), shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights. Although long-wavelength ultraviolet is not considered an ionizing radiation because its photons lack the energy to ionize atoms, it can cause chemical reactions and causes many substances to glow or fluoresce. Consequently, the chemical and biological effects of UV are greater than simple heating effects, and many practical applications of UV radiation derive from its interactions with organic molecules. Short-wave ultraviolet light damages DNA and sterilizes surfaces with which it comes into contact. For h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solid-state Laser
A solid-state laser is a laser that uses a gain medium that is a solid, rather than a liquid as in dye lasers or a gas as in gas lasers. Semiconductor-based lasers are also in the solid state, but are generally considered as a separate class from solid-state lasers, called laser diodes. Solid-state media Generally, the active medium of a solid-state laser consists of a glass or crystalline "host" material, to which is added a "dopant" such as neodymium, chromium, erbium, thulium or ytterbium.Z. Su, J. D. Bradley, N. Li, E. S. Magden, Purnawirman, D. Coleman, N. Fahrenkopf, C. Baiocco, T. Adam, G. Leake, D. Coolbaugh, D. Vermeulen, and M. R. Watts (2016"Ultra-Compact CMOS-Compatible Ytterbium Microlaser" ''Integrated Photonics Research, Silicon and Nanophotonics 2016'', IW1A.3. Many of the common dopants are rare-earth elements, because the excited states of such ions are not strongly coupled with the thermal vibrations of their crystal lattices (phonons), and their operational t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Excimer Laser
An excimer laser, sometimes more correctly called an exciplex laser, is a form of ultraviolet laser which is commonly used in the production of microelectronic devices, semiconductor based integrated circuits or "chips", eye surgery, and micromachining. Since 1960s excimer lasers are widely used in high-resolution photolithography machines, one of the critical technologies required for microelectronic chip manufacturing. Terminology and history The term excimer is short for 'excited dimer', while exciplex is short for 'excited complex'. Most excimer lasers are of the noble gas halide type, for which the term ''excimer'' is, strictly speaking, a misnomer. (Although less commonly used, the proper term for such is an exciplex laser.) Excimer laser was proposed in 1960 by Fritz Houtermans. The excimer laser development started with the observation of a nascent spectral line narrowing at 176 nm reported in 1971 by Nikolai Basov, V. A. Danilychev and Yu. M. Popov, at the Leb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hu Ning
Hu Ning (; 1916–1997) was a Chinese physicist and writer. Biography Hu was born in Suqian, Jiangsu, China on 11 February 1916. From 1928 to 1934, Hu studied at the Zhenjiang High School () in Zhenjiang, and Suzhou High School in Suzhou. In 1935, Hu studied at the physical department of Zhejiang University in Hangzhou, Zhejiang. From 1935 to 1937, Hu studied in the department of physics at Tsinghua University in Beijing, where he graduated in 1938. After his graduation from Tsinghua, Hu became the teaching assistant for his professor Zhou Peiyuan in the department of physics. In 1940, Hu examed and won the Boxer Indemnity Scholarship Program. In 1941, Hu went to study in the United States. Hu studied fluid mechanics at the California Institute of Technology. His doctoral advisor was Theodore von Kármán. Hu also studied quantum mechanics under Paul Sophus Epstein during this period. Hu obtained his PhD in 1943 from Caltech. From 1944 to 1945, Hu stayed at the Institute f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fuzhou
Fuzhou (; , Fuzhounese: Hokchew, ''Hók-ciŭ''), alternately romanized as Foochow, is the capital and one of the largest cities in Fujian province, China. Along with the many counties of Ningde, those of Fuzhou are considered to constitute the Mindong (lit. Eastern Fujian) linguistic and cultural area. Fuzhou lies on the north (left) bank of the estuary of Fujian's largest river, the Min River. All along its northern border lies Ningde, and Ningde's Gutian County lies upriver. Its population was 7,115,370 inhabitants as of the 2010 census, of whom 4,408,076 inhabitants are urban representing around 61.95%, while rural population is at 2,707,294 representing around 38.05%. As of 31 December 2018, the total population was estimated at 7,740,000 whom 4,665,000 lived in the built-up (''or metro'') area made of 5 urban districts plus Minhou County. In 2015, Fuzhou was ranked as the 10th fastest growing metropolitan area in the world by Brookings Institution. Fuzhou is listed as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chemistry
Chemistry is the science, scientific study of the properties and behavior of matter. It is a natural science that covers the Chemical element, elements that make up matter to the chemical compound, compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a Chemical reaction, reaction with other Chemical substance, substances. Chemistry also addresses the nature of chemical bonds in chemical compounds. In the scope of its subject, chemistry occupies an intermediate position between physics and biology. It is sometimes called the central science because it provides a foundation for understanding both Basic research, basic and Applied science, applied scientific disciplines at a fundamental level. For example, chemistry explains aspects of plant growth (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
