Enhancement of intermediate-field two-photon absorption by rationally shaped femtosecond pulses

Journal Article · Fri Feb 15 00:00:00 EST 2008 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.77.021403· OSTI ID:21140425

Chuntonov, Lev; Rybak, Leonid; Gandman, Andrey; Amitay, Zohar ^[1]

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1. Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000 (Israel)

We extend the powerful frequency-domain analysis of femtosecond two-photon absorption to the intermediate-field regime of considerable absorption yields, where additionally to the weak-field nonresonant two-photon transitions also four-photon transitions play a role. Consequently, we rationally find that the absorption is enhanced over the transform-limited pulse by any shaped pulse having a spectral phase that is antisymmetric around one-half of the transition frequency and a spectrum that is asymmetric around it (red or blue detuned according to the system). The enhancement increases as the field strength increases. The theoretical results for Na are verified experimentally.

• OSTI ID: 21140425
• Journal Information: Physical Review. A, Vol. 77, Issue 2; Other Information: DOI: 10.1103/PhysRevA.77.021403; (c) 2008 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
ASYMMETRY
MULTI-PHOTON PROCESSES
PHOTON-ATOM COLLISIONS
PHOTONS
PULSES
SODIUM
SPECTRA
VELOCITY