摘要
提出气流与化学激光的“对流-非平衡交叉弛豫”的理论。对于气流介质的湍流和层流混合两类流动模型,分别导出了增益系数和饱和增益谱的表示式;得到了一些新的饱和规律;非饱和增益和饱和增益均与流向距离有关。具有Doppler加宽的饱和放大器的增益线形,呈现非均匀和均匀加宽并存的“反常”现象。本理论与实验结果相符合。
In this paper a 'convection-nonequilibrium cross relaxation' theory is presented for a gas flow and chemical lasers: The experessions of gain coefficienr and saturated gain spec-trum are derived for the two-type flow models of a gas flow medium with turbulent or lami-nar flow mixture respectively. Some new gain saruration laws are obtained. The unsaturated and saturated gain are dependent on the streamwise distance. The numerical results show that the gain profiles of a saturated amplifier with Doppler-broadening presents some 'anoma-lous' phenomena with a mixture of inhomogeneous and homogeneous profiles. The present theoretical results agree with the measured results
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第3期407-416,共10页
Acta Physica Sinica
基金
国家自然科学基金
