Ab Initio Photon-Electron and Electron-Vibration Coupling Calculations Related to Laser Cooling of Ion-Doped Solids
نویسندگان
چکیده
An ab initio approach is developed to determine the photon-electron and electron-vibration coupling rates, for ion-doped materials related to laser cooling of solids. The ground and excited state energies are determined, and the corresponding geometries optimized. Using the first-principle wavefunctions, the electric transition dipole moment co necting the ground and excited states is calculated, and is found to be highly dependent on the symmetry properties of the system. The electron-phonon coupling is caused by the modification of the electronic wavefunction in response to the nuclei motions, and by the modifications of the vibrational modes before and after the transition. This theory is used to calculate the nonradiative decay rate, which is strongly dependent on the temperature. Based on such an understanding of the photon-electron and electron-vibration coupling physics, the optimal selection of laser cooling materials is discussed.
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