Role of quadratic and cubic spectral phases in ladder climbing with ultrashort pulses

Journal Article · Mon Nov 01 00:00:00 EST 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.053414· OSTI ID:20646248

Chatel, Beatrice; Degert, Jerome; Girard, Bertrand ^[1]

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1. Laboratoire de Collisions, Agregats, Reactivite (CNRS UMR 5589), IRSAMC Universite Paul Sabatier, 31062 Toulouse (France)

Two-photon excitation of a quantum ladder system by an ultrashort chirped pulse leads to interferences in the excited-state population, between direct and sequential paths. Experimental results have been obtained in atomic sodium vapor. The presence of several intermediate and final states leads to new phenomena. The interplay between the two sequential paths leads to strongly contrasted oscillations and a large enhancement of the transition probability for precise values of the chirp. A cubic spectral phase modifies significantly the behavior of the quantum interferences and can be used to enhance the two-photon absorption rate.

• OSTI ID: 20646248
• Journal Information: Physical Review. A, Vol. 70, Issue 5; Other Information: DOI: 10.1103/PhysRevA.70.053414; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
EXCITATION
EXCITED STATES
INTERFERENCE
LIFETIME
MULTI-PHOTON PROCESSES
OSCILLATIONS
PHOTON-ATOM COLLISIONS
PHOTONS
PROBABILITY
PULSES
SODIUM
VAPORS