Two-step Optical Excitation for Doppler Linewidth Reduction and Motion Study of Ions Stored in a Paul Trap

Autor:	W. Kälber, G. Meisel, J. Rink, Richard C. Thompson
Rok vydání:	1992
Předmět:	Materials science business.industry Atomic and Molecular Physics and Optics Ion symbols.namesake Laser linewidth Optics Excited state Quadrupole symbols Physics::Atomic Physics Ion trap Atomic physics business Doppler effect Excitation Tunable laser
Zdroj:	Journal of Modern Optics. 39:335-347
ISSN:	1362-3044 0950-0340
DOI:	10.1080/09500349214550331
Popis:	Atomic thorium ions were stored in an r.f. quadrupole trap and excited by tunable laser light. One-step and two-step excitation schemes were applied; a four to eightfold reduction of the Doppler linewidth is obtained for the two-step scheme with essentially no loss in signal strength. The Doppler-free two-photon transition was also observed. The lineshapes were calculated using a simple model; the observed profiles were well reproduced proving that the velocity and acceleration features of stored ions are properly accounted for. A further reduction of the Doppler linewidth is expected for the two-step method if a short lived intermediate level is used.
Databáze:	OpenAIRE
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