【摘要】 <正> 在通常的激光理论中,非平衡有序结构(即耗散结构)的形成是根据最低次的非线性修正论证的。这显然有相当的人为性。如果提高近似程度,会不会出现新的现象(如多重稳定态,新的稳定分支等)更多还原

【Abstract】 Detailed calculations concerning the dynamical mechanism of dissipative structure formation have been made for the simplest laser-single-mode oscillation of the static atom on the basis of Lambt’s semi-classical theory. Besides a conventional approxi- mation of T_E》1/γ》1/(T_E is the characteristic time of the elec- trical amplitude, two more special simplications are adopted. 1. The decay constants of the two working energy levels are assumed to be equal i.e.γ_a=γ_b=γ. 2. The electrical oscillation frequency is tuned to the Bohr’s frequency between the levels . An exact time-raring equation of the amplitude of the electrical field has been derived. Analysis of the equation shows that a picture of loss structure formation resulted commonly from the non-linear correction with the lowest order can be acceptable, that is the exact equation gives no new features of the contents .更多还原