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Barium borate is an inorganic compound, a borate of barium with a chemical formula BaB 2 O 4 or Ba(BO 2) 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 ...
Borate ions occur, alone or with other anions, in many borate and borosilicate minerals such as borax, boracite, ulexite (boronatrocalcite) and colemanite. Borates also occur in seawater, where they make an important contribution to the absorption of low frequency sound in seawater. [1] Borates also occur in plants, including almost all fruits. [2]
The Borate Minerals are minerals which contain a borate anion group. The borate (BO 3 ) units may be polymerised similar to the SiO 4 unit of the silicate mineral class. This results in B 2 O 5 , B 3 O 6 , B 2 O 4 anions as well as more complex structures which include hydroxide or halogen anions. [ 2 ]
The ratio of tellurate to borate reflects the degree of condensation. In [TeO 4 (BO 3) 2] 8-the anions are linked into a chain. [1] In [TeO 2 (BO 3) 4] 10− the structure is zero dimensional with isolated anions. These arrangements of oxygen around boron and tellurium can have forms resembling silicates. The first borotellurates to be ...
A 405 nm laser goes through a barium borate crystal to produce pairs of 810 nm photons with polarizations orthogonal to each other. These then hit a beam splitter, which sends photons back to the barium borate crystal with 50% probability. The 405 nm pumping beam also bounces from a mirror and comes back to the barium borate.
Pages in category "Borates" The following 60 pages are in this category, out of 60 total. ... Barium borate; Borate bromide; Borate carbonate; Borate and Daggett ...
Schematic of SPDC process. Note that conservation laws are with respect to energy and momentum inside the crystal.. Spontaneous parametric down-conversion (also known as SPDC, parametric fluorescence or parametric scattering) is a nonlinear instant optical process that converts one photon of higher energy (namely, a pump photon) into a pair of photons (namely, a signal photon, and an idler ...
First, a photon is shot through a specialized nonlinear optical device: a beta barium borate (BBO) crystal. [3] This crystal converts the single photon into two entangled photons of lower frequency, a process known as spontaneous parametric down-conversion (SPDC). These entangled photons follow separate paths.