【摘要】 本文在过去工作的基础上,研究六能级系统在10MW/cm²功率泵浦下CH₃F分子气体的多光子过程.文中提出了多光子共振图,从而可预示系统中各类多光子过程以及在x-y平面远红外频率随光泵频率变化的轨迹轮廓.理论计算揭示了三光子共振过程对系统增益的贡献,表明在一般情况下,三光子过程具有很小的增益值,而在某些特定频率下,却具有可观的增益,但调谐范围很窄.此外,还讨论了多光子过程之问的相互作用,这些作用除将影响远红外激光的调谐特性外,还存在互相抑制和互相增强的效应.更多还原

【Abstract】 The transitions between energy levels in the molecular system under the action of optical pumping, should not constrain themselves within only three or four levels. In this paper, multiphoton processes are Studied theoretically by assuming that for the sake of simplicity only six energy levels were considered. In ordinary case, the multiphoton process gave much more smaller contribution to the system gain than single photon or Raman process. The condition would be changed by the increasing of the pumping power. A diagram of multiphoton resonances has been developed.更多还原