Open AccessРазгорание и затухание импульсной катодолюминесценции в монокристаллах и керамиках Nd:ИАГ
Author(s) -
В.И. Соломонов,
А.В. Спирина,
А.С. Макарова
Publication year - 2021
Publication title -
optika i spektroskopiâ
Language(s) - English
Resource type - Journals
eISSN - 2782-6694
pISSN - 0030-4034
DOI - 10.21883/os.2021.07.51076.295-20
Subject(s) - cathodoluminescence , luminescence , ion , atomic physics , kinetics , ionization , electron , radiative transfer , ultraviolet , materials science , chemistry , physics , optics , optoelectronics , organic chemistry , quantum mechanics
The kinetics of pulsed cathodoluminescence of Nd3+ ions in Nd:YAG single crystals and ceramic samples was studied. In these substances, luminescence appears after the ending of exposure by an electron beam with a duration of 2 ns. Optical transitions are observed from the 2F2 5/2 level and manifest themselves in the ultraviolet and visible regions of the spectrum, and from the 4F 3/2 level – in the near infrared region. The kinetics of luminescence is characterized by a rise and a decay and is described by the difference between two exponential functions. It has been determined that the characteristic decay times of luminescence are the lifetimes of the 2F2 5/2 and 4F 3/2 radiative levels, and the time of a rise is determined by the pumping mechanism. Moreover, the pumping of the uppermost Stark component of the 2F2 5/2 level occurs in the process of linear recombination of the ionized neodymium ion with free electrons, and the 4F 3/2 level is due to nonradiative transitions from the upper levels.