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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 26 — Dec. 22, 2008
  • pp: 21922–21929

Two-photon resonant excitation of a doubly excited state in He atoms by high-harmonic pulses

Taro Sekikawa, Tatsuya Okamoto, Eisuke Haraguchi, Mikio Yamashita, and Takashi Nakajima  »View Author Affiliations


Optics Express, Vol. 16, Issue 26, pp. 21922-21929 (2008)
http://dx.doi.org/10.1364/OE.16.021922


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Abstract

We experimentally demonstrate a two-color two-photon resonant excitation of the doubly excited 2p21S state in helium atoms by the combination of 19th and 21st harmonic photons of a Ti:sapphire laser. Production of the 2p21S state is confirmed by the experimental observation that the electron emission from this state does not depend on the direction of harmonic polarization. Our ab-initio theoretical results through the solution of time-dependent Schrödinger equation are consistent with the experimental results and confirm the first successful production of a doubly excited state by high-harmonic pulses.

© 2008 Optical Society of America

OCIS Codes
(190.4160) Nonlinear optics : Multiharmonic generation
(190.4180) Nonlinear optics : Multiphoton processes

ToC Category:
Nonlinear Optics

History
Original Manuscript: November 11, 2008
Revised Manuscript: December 3, 2008
Manuscript Accepted: December 7, 2008
Published: December 17, 2008

Citation
Taro Sekikawa, Tatsuya Okamoto, Eisuke Haraguchi, Mikio Yamashita, and Takashi Nakajima, "Two-photon resonant excitation of a doubly excited state in He atoms by high-harmonic pulses," Opt. Express 16, 21922-21929 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-26-21922


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