Spectral phase measurement of attosecond pulses using the quantum beat between the P{sub 1/2} and P{sub 3/2} levels of alkali-metal atoms
- Kansai Photon Science Institute, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa, Kyoto 619-0215 (Japan)
We propose a method for measuring the spectral phase of attosecond pulses by means of angle-resolved photoelectron spectroscopy of alkali-metal atoms in the {sup 2}P state. A coherent superposition of the {sup 2}P{sub 1/2} and {sup 2}P{sub 3/2} states allows us to observe the quantum beat, whose phase offset is obtained as a function of photoelectron energy. The formulation derived in this study elucidates that the phase offset is straightforwardly utilized for determining the spectral phase of attosecond pulses. This method is applicable not only to near transform-limited attosecond pulses, but also to significantly chirped pulses with the same spectrum. Numerical simulation for Cs atoms demonstrates the feasibility in the experiment and the simplicity in the analysis. From a practical point of view, there is no need for the most advanced technologies like nonlinear optics by high harmonics, phase stabilization of fundamental pulses, and sub-optical-cycle resolution of a delay line, some of which have been required in the other methods.
- OSTI ID:
- 21020580
- Journal Information:
- Physical Review. A, Vol. 76, Issue 3; Other Information: DOI: 10.1103/PhysRevA.76.033810; (c) 2007 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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