Chapter 151 Coherent emission in rare-earth materials
作者： F. Auzel
DOI: 10.1016/S0168-1273(96)22008-2
关键词: Optical cavity 、 Atomic physics 、 Superradiance 、 Spontaneous emission 、 Amplified spontaneous emission 、 Chemistry 、 Stimulated emission 、 Laser 、 Excited state 、 Photon
摘要: Publisher Summary This chapter discusses the coherent emission in rare-earth materials. The three types of emissions connected with spontaneous emission, which differ from laser by common feature that they do not require a closed optical cavity are—Dieke superradiance (SR), superfluorescence (SF), and amplified stimulated (ASE). As for SF, atoms being prepared incoherently their excited state emit cooperative self-organization stemming emitted field. Though sometimes called “superradiance,” ASE would happen long medium without mirror. Propagation plays an important role is necessary pure SR SF cases. Typical reduced fluorescent lifetime, can become much shorter than non-radiative decay. Then radiative process may even overtake one. Spontaneous characterized its independence initial photon number, is, n =0.
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