Phys. Rev. Lett. 90, 133902 (2003) [4 pages]Two-Photon Ionization of He through a Superposition of Higher HarmonicsReceived 3 July 2002; published 4 April 2003 We present experimental results and theoretical analysis of two-photon ionization of He by a superposition of the 7th to the 13th harmonic of a Ti:sapphire laser. Solving the time-dependent Schrödinger equation for He in a coherent polychromatic field, the He+ yield is calculated. From this yield the number of He+ ions produced has been estimated and found in reasonable agreement with its measured value. The present results establish the feasibility of a second-order autocorrelation measurement of superposition of harmonics, and thus they represent the precursor towards the direct temporal characterization of attosecond pulse trains. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.133902
DOI:
10.1103/PhysRevLett.90.133902
PACS:
42.65.Ky, 32.80.Rm
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.