Title :
Laser-induced continuum structure and population trapping in helium (2s/sup /spl plusmn//s/sub 0/)
Author :
Halfmann, T. ; Yatsenko, L.P. ; Shapiro, Marc ; Shore, B.W. ; Bergmann, Karel
Author_Institution :
Fachbereich Phys., Kaiserslautern Univ., Germany
Abstract :
Summary form only given.We present experimental observations along with theoretical modeling of a laser induced continuum structure (LICS) in He. 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.
Keywords :
Stark effect; excited states; helium; laser beam effects; photoionisation; radiation pressure; 1064 nm; 294 nm; 4s/sup 1/S/sub 0/; AC Stark effect; He; LICS; LICS structures; excited state; helium (2s/sup /spl plusmn//s/sub 0/); induced continuum structure; ionization; ionization continuum; laser-induced continuum structure; population trapping; power broadening; strong laser radiation; theoretical modeling; weak laser pulse; Bandwidth; Cost function; Delay effects; Genetic mutations; Ionization; Laser theory; Phase control; Robust control; Stimulated emission; Time measurement;
Conference_Titel :
Quantum Electronics Conference, 1998. IQEC 98. Technical Digest. Summaries of papers presented at the International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
1-55752-541-2
DOI :
10.1109/IQEC.1998.679994
