Nonlinear optical processes and the nearest neighbor distribution in rubidium vapor

Parametric Four Wave Mixing;Nearest Neighbor Distribution;Light-Matter Interactions;Nonlinear Optics;Rubidium;Density Matrix;Molecular Dynamics

Spinka, Thomas M.

关键词: Parametric Four Wave Mixing;    Nearest Neighbor Distribution;    Light-Matter Interactions;    Nonlinear Optics;    Rubidium;    Density Matrix;    Molecular Dynamics;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/16717/Spinka_Thomas.pdf?sequence=2&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Nonlinear optical processes, with a particular emphasis on parametric four-wave mixing(PFWM), are studied in rubidium vapor. A theoretical framework is introduced that enablesaccurate calculations of nonlinear light-matter interactions, and calculations of theseinteractions using this framework are performed for a broad range of excitation conditions.In particular, the effects of femtosecond pulse parameters such as pulse duration, pulse energy,center wavelength, and chirp are investigated. Simulation results provide insight intothe light-matter interactions in rubidium vapor for these conditions. The effects of pumppulse parameters on the production and evolution of atomic wavepackets in the nonlinearmedium are investigated. A number of femtosecond-scale phenomena that were elusive orpreviously unknown are observed, including the observation of quantum beating at pump-probetime delays exceeding 500 ps, quantum beating on the 7s1/2 - 5d3/2 energy defect at611 cm-1, and the effects of pump pulse chirp on the amplitude and temporal dynamics ofquantum beating. Toward the goal of using the nonlinear optical process of PFWM to interrogatethe nearest neighbor distribution (NND), a new analytical derivation for the NND inthe non-interacting particle approximation is presented, along with the results of moleculardynamics simulations of the NND in rubidium vapor for realistic pair interaction potentials.