In this paper , the system of a a - type three - level atom interacting with two - mode su ( 1 , 1 ) coherent states in a kerr - like medium is studied by means of the quantum theory , and the state function for the resonant or non - resonant interaction is derived . using the state function , the kerr effect on the quantum dynamics and nonclassical properties in the system is investigated ; and the influences of the detuning and initial atomic on the quantum and nonclassical properties in the non - resonant interaction study system 本文运用全量子理论，研究了类kerr介质中双模su ( 1 ， 1 )相干态场与型三能级原子相互作用系统，分别导出了该系统在共振及非共振相互作用时的态函数，并以此为出发点，研究了kerr效应对系统的量子动力学和非经典特性的影响，场模失谐量、原子初态对非共振作用系统的量子动力学和非经典特性影响。
The optimal length of crystal was achieved for the characteristics of quasi - three - level . three types of crystal were compared , we select lbo as the main frequency doubler . meanwhile , the other strong spectrum were restrained by suitable coating 从激光晶体的准三能级特性出发，充分考虑增益与损耗之间的矛盾，选择出最佳晶体长度；对三种倍频晶体进行了比较，选择出lbo作为主要倍频晶体；对膜系进行了必要的分析，在维持946nm谱线振荡的同时，充分考虑了其它激光谱线的抑制。
