Measurements of the time evolution of coherent excitation

by Camp, Howard Alan

Abstract (Summary)
In recent years, coherent excitation techniques have focused on the

ability to efficiently prepare atomic or molecular systems into a

selected state. Such population control plays a key role in

cutting-edge research taking place today, such as in the areas of

quantum information and laser-controlled chemical reactions.

Stimulated Raman adiabatic passage (STIRAP) is a widely-used

coherent excitation technique that provides a relatively robust

control mechanism for efficiently exciting a target population into

a desired state. While the technique is well proven, current

experimental techniques yield little information on the population

dynamics taking place throughout the excitation process, and

experimentalists rely solely on final excited-state measurements to

determine the efficiency of population transfer. This dissertation

presents a unique diagnostic tool to measure multilevel coherent

population transfer on a short (nanosecond) timescale. The

technique described here uses magneto-optical trap recoil ion

momentum spectroscopy (MOTRIMS) as a noninvasive probe of a

coherently-controlled system. It provides extremely detailed

information about the excitation process, and highlights some

important characteristics seen in excited populations that would

otherwise be misleading or completely overlooked if one were to use

more traditional diagnostic techniques. This dissertation discusses

both the theoretical and experimental results applied to three-level

coherently excited target populations of Rb-87.

Bibliographical Information:


School:Kansas State University

School Location:USA - Kansas

Source Type:Master's Thesis

Keywords:coherent excitation time evolution stirap stimulated raman adiabatic passage motrims magneto optical trap recoil ion momentum spectroscopy coltrims physics atomic 0748 molecular 0609 optics 0752


Date of Publication:01/01/2005

© 2009 All Rights Reserved.