Observation of Quantum Observation of Quantum Coherence Coherence for Gaseous Molecules for Gaseous Molecules Jian Tang 唐 唐 ( ) Natural Science and Technology (Ch emistry) Okayama University FPUA2010 FPUA2010 Aug. 7-9, Osaka Univ Aug. 7-9, Osaka Univ
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Observation of Quantum Coherence for Gaseous Molecules
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Observation of Quantum Observation of Quantum CoherenceCoherence
for Gaseous Moleculesfor Gaseous Molecules
Jian Tang (唐 健)Natural Science and Technology (Chemistry)
Okayama University
FPUA2010FPUA2010 Aug. 7-9, Osaka Univ.Aug. 7-9, Osaka Univ.
Collaborators
Okayama Univ. (Chemistry) Okayama Univ. (Physics)
Y. Okabayashi (岡林祐介) K. Nakajima (中島享)
Y. Miyamoto (宮本祐樹) S. Kuma (久間晋)
K. Kawaguchi (川口建太郎) A. Fukumi (福見敦)
T. Taniguchi (谷口敬)
Tokyo Institute of Technology I. Nakano (中野逸夫)
H. Kanamori (金森英人) N. Sasao (笹尾登)
M. Yoshimura (吉村太彦)
Motivation and Approach
• Searching for quantum coherence in isolated matrix:
demonstrate the ability to observe the phenomenon
for gaseous molecules, done or yet done
• Optical quantum coherence:
optical nutation, free induced decay (FID )
photon echo, and superradiance
• Linewidth of vibration-rotation transitions for gaseous mo
lecules (Doppler width ~100 MHz):
IR cw-lasers with narrow linewidth (<1 MHz)
Coherent transient effects
• Relaxation time: T1≳T2 (homo T2' and inhomo T2*)
• Absorption and coherent emission <T2
transient nutation, optical FID, photon echo
superradiance for population inverted levels
• Pulsed lasers or cw-lasers with either Stark (molecular)
switching or frequency switching
• Previous studies mainly with frequency-fixed IR lasers
• Recent development on the tunable cw-OPO laser provi
des us a new tool for the observation
Stark switching
• R. G. Brewer et al. (IBM, 1970s)
Stark pulsed field shift suddenly the absorption re
sonance from velocity group v to velocity group v'