Ba-Sr系统激光感生碰撞能量转移的数值计算  

Numerical calculation of laser-induced collisional energy transfer in Ba-Sr system

作　　者：张洪英[1] 陈德应[1] 鲁振中[1] 樊荣伟[1] 夏元钦[1] 

机构地区：[1]哈尔滨工业大学光电子技术研究所,可调谐激光技术国家级重点实验室,哈尔滨150001

出　　处：《物理学报》2008年第12期7600-7605,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10674036;10774033);哈尔滨工业大学优秀团队支持计划资助的课题~~

摘　　要：以现有的激光感生碰撞能量转移的四能级理论模型为基础,通过直接积分态振幅的运动方程,对弱场、强场两种情况下Ba-Sr系统的激光感生碰撞能量转移过程进行了数值计算,得到了两种情况下的激光感生碰撞跃迁概率和碰撞截面的谱线线型.在弱场情况下的数值计算结果与近似解析解的计算结果符合很好.对强场情况下的数值积分计算结果表明:激光感生碰撞作用随转换激光强度的增大而增强;强场时激光感生碰撞截面谱线的峰值位置明显偏离了共振频率并向紫端移动,且碰撞截面谱线的半宽度(即调谐范围)较之弱场明显变小.Based on the existing four-level model of laser-induced collisional energy transfer, the collision process in Ba-Sr system in both weak and strong fields is calculated by immediate integration of the equation of motion, and profiles of laser-induced transition probability and collision cross section under both conditions are obtained. Numerical results for the weak field are in fair to good agreement with former analytical results, while the ones for the strong field show that the effect of laser-induced collision is enhanced when the transfer laser intensity increases. Moreover, the peak of the laser-induced collisional energy transfer spectrum shows an evident shift from resonant frequency to the violet side in strong field, and full width at half maximum （i. e. tuning range） of the spectrum becomes obviously narrower compared with that in weak field.

关 键 词：激光感生碰撞能量转移 碰撞截面 Ba—Sr系统 强场 

分 类 号：O431.2[机械工程—光学工程]