共掺染料分子系统激光感生碰撞能量转移和强光场感生碰撞双电荷转移过程的理论与实验研究

The laser-induced collision is a nonlinear optical process in which a laser field is used during the inelastic collision between two different particles.The ability of selectively exciting the special energy level of the chosen atomic makes significant steps toward developing the short-wavelength laser sources and active control of chemical channels. In the aspect of laser induced energy transfer in this work, we propose to sudy the laser induced collisional energy trnaser in codoped laser dye systems. To transfer energy between codoped laser dye molecules by laser induced collision is beneficial to broadening the tuning range，increasing the efficiency and prolonging service life of dye laser.Moreover, to study the energy transfer between polyatomic molecules is of great significance for the development of manipulating the energy level excitation of the polyatomic molecule, and it permits potential applications in controlling pathways of chemical reactions by coherent laser. For the study of laser induced charge transfer, a new nonlinear process of strong laser field induced double charge transfer process is proposed. This kind of charge transfer is a nonlinear process in which the double charge can be transfered from one atomic or molecular species to another different species by the joint action of the collisional and radiative interactions. To study this new nonlinear process is of great significance for understanding the essential characteristics of particle movement in strong field.

激光感生碰撞是在激光场和碰撞共同作用下实现粒子间能量转移的一种非线性光学过程，可以高效地激发所选粒子特定靶能级的能力使其在获得短波长激光及控制化学反应通道方面具有重要意义。本项目在激光感生碰撞能量转移方面，将激光感生碰撞的研究从气相单原子分子碰撞首次拓展到液相共掺染料大分子系统碰撞，通过激光感生碰撞实现共掺染料分子间能量转移，这对拓展蓝紫光波段染料激光调谐范围，提高染料激光介质的效率、寿命及实用性具有重要意义。本项目在激光感生碰撞电荷转移方面，提出一种新的非线性过程：强光场感生碰撞双电荷转移过程。这种电荷转移过程，是在激光场与粒子碰撞同时作用下产生的跨越粒子间的双电荷转移过程。对这种新的非线性过程的研究有助于更深入的了解强场作用下粒子运动的本质特性。

激光感生碰撞是在激光场和碰撞共同作用下实现粒子间能量转移的一种非线性光学过程，可以高效地激发所选粒子特定靶能级的能力使其在获得短波长激光及控制化学反应通道方面具有重要意义。本项目针对激光感生碰撞能量转移及电荷转移过程开展了相关的理论与实验研究。在激光感生碰撞能量转移方面，将激光感生碰撞的研究从气相单原子分子碰撞首次拓展到液相共掺染料大分子系统碰撞，开展了PM650-C460及PM597-C440共掺染料分子系统激光感生碰撞能量转移实验研究，实现了共掺染料分子间的能量转移。这对拓展蓝紫光波段染料激光调谐范围，提高染料激光介质的效率、寿命及实用性具有重要意义。为提高碰撞系统特定量子态制备效率，提出并研究了双光束激光感生碰撞能量转移过程。这种新的激光感生碰撞能量转移布局为我们提供了一种新的研究无辐射激发态能级Stark效应的新方法，同时该系统布局也能有效抑制背景效应提高碰撞系统能量转移效率。在激光感生碰撞电荷转移方面，理论及实验研究了强光场感生碰撞电荷转移过程。建立了强光场感生碰撞单电荷及双电荷转移理论模型，提出了新的激光感生单电荷转移及双电荷转移过程，针对提出的Xe+-N2单电荷转移过程及Ne2+-Xe双电荷转移过程开展了相关的理论及实验研究。理论分析了不同相互作用主导的电荷转移机制。通判定性实验证明了观测到的Ne2+-Xe及Xe+-N2间电荷转移过程是光场和碰撞共同作用的结果。