| 单词 | population inversion |
| 释义 | population inversionnoun Physics.a condition of matter in which more electrons are in a high energy state than in a lower energy state, as is required for the operation of a laser. Origin of population inversionFirst recorded in 1960–65 Words nearby population inversionpopulate, population, population control, population explosion, population genetics, population inversion, population parameter, population pressure, population pyramid, populism, populist Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Scientific definitions for population inversionpopulation inversion The condition of having enough excited or high-energy states distributed throughout a substance to sustain a chain-reaction of stimulated emission. Lasers, for example, need a constant power source that maintains population inversion in order to generate radiation continuously, since each stimulated emission reduces the population of high-energy states. See also stimulated emission. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
| 随便看 |
英语词典包含192737条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。