Coherent interaction of femtosecond extreme-uv light with He atoms
- Departments of Chemistry and Physics, University of California, Berkeley, California 94720 (United States) and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States)
We show experimentally that spectral phase manipulation of ultrashort extreme-uv light pulses can induce and control coherent transient excitation of the He(1s3p) excited state by the nonresonant components of the broadband extreme-ultraviolet light. The spectral phase manipulation of the 15th harmonic of an intense 805 nm, 80 fs pulse is achieved by propagation of the euv light through a variable optical density of He gas. The acquired spectral phase due to the dispersive interaction of the off-resonance components in the euv pulse with the He(1s3p) resonance enhances and modifies the transient excitation. The temporal evolution of the coherently prepared transient He(1s3p) amplitude is probed by ionization to the continuum with a 400 nm, 80 fs pulse.
- OSTI ID:
- 20974503
- Journal Information:
- Physical Review. A, Vol. 73, Issue 2; Other Information: DOI: 10.1103/PhysRevA.73.021805; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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