混合气体发射高次谐波的干涉效应  

Interference effects of high-order harmonic generation from mixed gases

作　　者：金发成 李小勇[1] 王国利[1] 周效信[1] 

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070

出　　处：《科学通报》2013年第34期3547-3552,共6页Chinese Science Bulletin

基　　金：国家自然科学基金(11264036;11064013)资助

摘　　要：通过求解三维Maxwell方程结合强场近似方法研究了激光驱动的混合气体(由He和Ne组成)发射高次谐波的宏观效应,观察到在实验上发现的高次谐波的干涉相消和干涉相长现象,研究了不同激光强度下混合气体的比例对高次谐波干涉效应的影响,发现在不同的谐波能区,干涉效应的强弱不同,从理论上给出了高次谐波在截至位置附近发生干涉相长时混合气体的最佳比例.We theoretically studied the interference effects of the macroscopic high-order harmonic generation from mixed gases （He and Ne） exposed to the intense infrared pulse by solving the three-dimensional Maxwell＇s equation and using strong field approximation, and found the destructive interference and constructive interference, which have been observed experimentally. It is shown that the degrees of the interference effects at several orders harmonics, radiated from different mixing ratios of He and Ne atoms driving by laser pulses, are different. In addition, we theoretically infer the optimum ratio of the mixed gases, which leads to the maximum interference effect of the high-order harmonic generation near the cut-off.

关 键 词：高次谐波 宏观效应 干涉效应 相位差 

分 类 号：O436.1[机械工程—光学工程]