Dopant
an Impurity added to a semiconductor to change the number of holes and electrons relative to each other. | ||||
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Dopant Definition from Science & Technology Dictionaries & Glossaries
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dopant
An impurity added to an optical medium to change its optical properties. Note: Dopants are used in optical fibers to control the refractive index profile and other refractive properties of the fiber. [FAA]
An impurity added to an optical medium to change its optical properties. Note: Dopants are used in optical fibers to control the refractive index profile and other refractive properties of the fiber. [FAA]
Dopant Definition from Encyclopedia Dictionaries & Glossaries
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Dopant
A dopant, also called doping agent and dope, is an impurity element added to a crystal or semiconductor lattice in low concentrations in order to alter the optical/electrical properties of the semiconductor.
Also, doping with Yb, Er, Nd, Tm, Cr of optical crystals, ceramics and glasses is used to make the solid-state lasers; the elements mentioned are the most common dopants. In many optically-transparent ghosts, such active centers may keep their excitation for a time on the order of milliseconds, and relax with stimulated emission, providing the laser action. The amount of dopant is usually measured in atomic percent; usually the relative atomic percent is assumed, taking into account that the dopant ion can substitute the only part of site in a crystalline lattice. The doping can be also used to change the refraction index in optical fibers, especially in the double-clad fibers. The optical dopants are characterized with lifetime of excitation and the effective absorption and emission cross-sections, which are main parameters of an active dopant. Usually the concentration of optical dopant is of order of few percent or even lower. At large density of excitation, the cooperative quenching (cross-relaxation) reduces the efficiency of the laser action.
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