Open AccessThreshold and saturation properties of two-dimensional random lasers and mode selection
Author(s) -
Jinsong Liu,
Hai Liu,
Wang Chun,
Lyu Jian-Tao,
Ting Fan,
Xiaodong Wang
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.4123
Subject(s) - lasing threshold , laser , rate equation , random laser , saturation (graph theory) , mode (computer interface) , intensity (physics) , materials science , physics , optics , quantum mechanics , computer science , mathematics , combinatorics , kinetics , operating system
Based on the time dependent theory of random lasers, which was established via combining Maxwell equations with the rate equations of a four-level atomic system, the output intensity of lasing modes varying with the pump rate and area as well as the medium's size and shape is simulated for two-dimensional random media by use of the finite difference time domain method. Results show that the pump-rate dependence of the output intensity presents not only a threshold property, but also a saturation property, just like that of the lasing modes in conventional lasers. Based on the dependence of mode property on the medium's and pump's parameters, the mode-selection approaches are proposed for two-dimensional random lasers, which are quite different from those performed in conventional lasers.