Abstract A femtosecond laser pulse can be tailored to control the two-photon transitions using the ultra-fast pulse-shaping technique. This paper theoretically and experimentally demonstrates that two-photon transitions in molecular system with broad absorption line can be effectively controlled by square phase-modulation in frequency domain, and the influence of all parameters characterizing the square phase-modulation on two-photon transitions is systemically investigated and discussed. The obtained results have potential application in nonlinear spectroscopy and molecular physics.
Received: 25 December 2007
Revised: 16 January 2008
Accepted manuscript online:
PACS:
42.50.Hz
(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10574046), National
Key Project for Basic Research of China (Grant Nos 2006CB806006 and
2006CB921105), Program for Changjiang Scholars and Innovative
Research Team in University (PCSIRT), Program for New Century
Excellent Talents in University (NCET-04-0420), the Doctoral Program
of High Education (Grant No 20050269011), Phosphor Program sponsored
by Shanghai Science and
Technology Committee (Grant No 06QH14003).
Cite this article:
Zhang Shi-An(张诗按), Wang Zu-Geng(王祖赓), and Sun Zhen-Rong(孙真荣) Quantum coherent control of two-photon transitions by square phase-modulation 2008 Chin. Phys. B 17 2914
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