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Laser-induced continuum structure and population trapping in helium (2s/sup 1/S/sub 0/)

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5 Author(s)
Halfmann, T. ; Fachbereich Phys., Kaiserslautern Univ., Germany ; Yatsenko, L.P. ; Shapiro, M. ; Shore, B.W.
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Summary form only given. We present experimental observations along with theoretical modeling of laser induced continuum structure (LICS) in helium. The excited state 4s/sup 1/S/sub 0/ is coupled to the ionization continuum with strong laser radiation at 1064 nm. The induced continuum structure is detected by ionization of the state 2s/sup 1/S/sub 0/ with a weak laser pulse at 294 nm. Enhancement as well as strong reduction of ionization due to trapping of population can be observed. We demonstrate how LICS structures move about in a systematic way as a result of the AC Stark effect and power broadening. Quantitative comparison between theory and experiment is possible because of the high spectral resolution achieved in this experiment.

Published in:

Quantum Electronics Conference, 1998. IQEC 98. Technical Digest. Summaries of papers presented at the International

Date of Conference:

8-8 May 1998