Phys. Rev. A 70, 063404 (2004) [8 pages]Coherent transient in dressed-state and transient spectra of Autler-Townes doubletReceived 17 August 2004; published 8 December 2004 In this paper we present a theoretical study of the time-dependent probe response in the presence of a strong pump field in a three-level pump-probe configuration. Two situations are investigated: a cw pump with a pulsed probe field and a pulsed pump with a cw probe field. The results are explained as dressed-state nutation and nutation by dynamic Stark switching. Dressed-state quantum beats are also an important feature for both situations. Furthermore, when a 90° phase shift after a π∕2 period is introduced in the pulsed probe field, there is a spin locking in the dressed-state transition. Our results give a satisfactory theoretical account of a previous experimental observation [ Wei et al. Phys. Rev. Lett. 74 1083 (1995)]. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.70.063404
DOI:
10.1103/PhysRevA.70.063404
PACS:
42.50.Md, 32.80.−t, 42.65.−k
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