和频过程中的超绝热演化与能量最大转换  

Superadiabatic evolution and robust energy conversion in sum frequency generation

作　　者：朱海飞[1] 徐永刚[1] 李百宏[1] 马平平[1] 张杰[1] 董瑞芳[2] 张首刚[2] 李永放[1] 

机构地区：[1]陕西师范大学,物理学与信息技术学院,西安710119 [2]中国科学院国家授时中心,中国科学院时间频率基准重点实验室,西安710600

出　　处：《中国科学：物理学、力学、天文学》2015年第5期25-35,共11页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：中国科学院国家授时中心和中国科学院时间频率基准重点实验室开放课题资助项目

摘　　要：基于准相位匹配技术和量子物理中的反向透热补偿方法,提出了一种超绝热条件下信号场能量完全转换成和频场能量的新方案.利用几何旋转面巧妙地揭示出系统附加反向透热补偿项的物理作用机理;类比弹性碰撞的物理过程,形象地说明了附加反向透热补偿修正项后系统能量转换的特性.借助于原子物理中的Bloch矢量法,清晰的展示了系统在超绝热条件下的演化过程,从新的角度图像化的揭示出体系捷径演化物理过程.利用这一新方案可优化系统的绝热演化过程、缩短耦合区间和非线性晶体长度,减少色散效应的影响,且可在较弱泵浦条件下实现高效的和频能量转换.该方案不仅为非线性光学器件的设计提供了一个很好的理论依据,而且其物理思想可普遍应用于多个领域.Based on the QPM technology and the counter diabatic compensation approach in quantum physics, we propose an optimal scheme that the signal field completely converts into the sum frequency field under the condition of the superadiabaticity. With the geometric rotation plane designed, we subtly reveals the physical mechanism of the systems before and after adding a counter diabatic term. The property of the energy conversion which is analogous to the elastic collision is explained for the addition counter diabatic compensation. With the help of Bloch vectors in atoms physics, we can clearly show the physics process of the complete energy conversion and the physical mechanism for the shortcuts of the superadiabaticity from a new perspective. This new scheme can optimize adiabatic process, shorten the coupling region and nonlinear crystal length, reduce the influence of the dispersion effect, and also implement the robust efficient energy conversion under the condition of relatively weak pump intensity. Not only does this scheme provide a good theoretical basis for the design of nonlinear optical devices, but also its physical thoughts can be widely used in many other fields.

关 键 词：和频过程 量子绝热 超绝热 Bloch矢量 

分 类 号：O413[理学—理论物理]