光电技巧模拟题和谜底(国外英文资料).doc

光电技术模拟题和答案(国外英文资料) Avalanche photodiode (APD) is the fastest photodiode currently in response. (fx) An absolute black body emits all wavelengths of radiation. (fx) Photodiode works in reverse bias condition, and also in zero offset condition. (fx) The necessary conditions for laser production are the work materials, cavity and pump source. (x) score examiners 3, the noun explanation (20 points, 5 points) Absolute black body: At any temperature, the absorption ratio of the incoming radiation of any wavelength is called absolute A black body, or a black body. The photoelectric effect: Light to the object on the surface of the emission electron, or conductivity changes, or producing photoelectric electromotive force, etc., the object caused by illumination electrical properties change phenomenon referred to as the photoelectric effect. Photoelectric couplers: The photoelectric coupler is a component of the light-emitting device and the receiving device, which is coupled to the output side by the medium of light. The photogenetic volt effect: The light shines in the semiconductor PN junction or metal - semiconductor interface, the PN junction or metal - semiconductor produce light on both sides of the electromotive force, this phenomenon is called light born v effect. score examiners 4, qa (20 points out of 20) (8) the fundamental difference between radiation measurement and light measurement is outlined. The definition of light measurements and radiation measurements, and the definition of the equation, correspond to each other, and the measurement of light only makes sense in the visible area (380-780nm). The basic characteristics of the three processes of spontaneous radiation, stimulated absorption and stimulated radiation are briefly described. Spontaneous radiation:? The atoms in the excited E2 transition from the E2 energy level to the E1 energy level, according to the principle of conservation of energy, simultaneously radiating a photon. Stimulated absorption: