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Laser pulse control of Raman processes by chirped non-adiabatic passage

✍ Scribed by F. Légaré; S. Chelkowski; A. D. Bandrauk

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 171 KB
Volume: 31
Category: Article
ISSN: 0377-0486
DOI: 10.1002/(sici)1097-4555(200001/02)31:1/2<15::aid-jrs495>3.0.co;2-a

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✦ Synopsis

Chirped pulses allow for non-adiabatic passage between dressed states of Raman processes. It is shown that using an appropriately chirped pulse, one can control the interference between resonant and non-resonant pathways in stimulated Raman processes. A three-level system is studied in detail and application to complete ro-vibrational level inversion to high vibration quantum numbers (v > 10) in H 2 via RCNAP (Raman chirped non-adiabatic passage) is presented.

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By a wavepacket propagation, we demonstrate the possibility of controlling the photodissociation branching ratio between two fragment channels by a single ultrashort linearly chirped laser pulse. It is found that a negatively chirped pulse of a moderate chirp rate completely prohibits the production