摘要We show that two trains of half-cycle pulses (HCPs) with different amplitudes irradiating alternately on polar molecules can achieve a remarkable enhancement of field-free orientation compared with the case of an equal amplitude HCPs train for the same pulse separation. This kind of orientation enhancements is mainly due to an optimal adjustment of the population distribution on every field-free angular momentum eigenstate, in which the populations on the undesired states of high angular momenta are effectively suppressed, and the populations on the desired states of low angular momenta are correspondingly promoted.
Abstract：We show that two trains of half-cycle pulses (HCPs) with different amplitudes irradiating alternately on polar molecules can achieve a remarkable enhancement of field-free orientation compared with the case of an equal amplitude HCPs train for the same pulse separation. This kind of orientation enhancements is mainly due to an optimal adjustment of the population distribution on every field-free angular momentum eigenstate, in which the populations on the undesired states of high angular momenta are effectively suppressed, and the populations on the desired states of low angular momenta are correspondingly promoted.
HUANG Yu-Xin;YANG Yu-Jun;ZHU Hong-Yu;WANG Li;WANG Hui;ZHU Qi-Ren. Field-Free Molecular Orientation Generated from Cyclic Rotational States by Using Two Trains of Half-Cycle Pulses[J]. 中国物理快报, 2007, 24(11): 3111-3114.
HUANG Yu-Xin, YANG Yu-Jun, ZHU Hong-Yu, WANG Li, WANG Hui, ZHU Qi-Ren. Field-Free Molecular Orientation Generated from Cyclic Rotational States by Using Two Trains of Half-Cycle Pulses. Chin. Phys. Lett., 2007, 24(11): 3111-3114.
[1] Brooks P R 1976 Science 193 11 [2] Gordon R J, Zhu L C, Schroeder W A and Seideman T 2003 J. Appl.Phys. 94 669 [3] Bartels R A, Weinacht T C, Wagner N, Baertschy M, Greene C H,Murnane M M and Kapteyn H C 2002 Phys. Rev. Lett. 88 013903 [4] Lee K F, Villeneuve D M, Corkum P B and Shapiro E A 2004 Phys. Rev. Lett. 93 233601 [5] Larsen J J, Laesen I W and Stapelfeldt H 1999 Phys. Rev.Lett. 83 1123 [6] Hay N, Velotta R, Lein M, Nalda R, Heesel E, Castillejo M andMarangos J P 2002 Phys. Rev. A 65 053805 [7] Bandrauk A D and Lu H Z 2003 Phys. Rev. A 68 043408 [8] Sugny D, Keller A, Atabek O, Daems D, Dion C M, Gu\'erin S andJauslin H R 2004 Phys. Rev. A. 69 033402 [9] Dion C M, Keller A and Atabek O 2005 Phys. Rev. A 72 023402 [10] Daems D, Gu\'erin S, Sugny D and Jauslin H R 2005 Phys.Rev. Lett. 94 153003 [11] Ortigoso J 2004 Phys. Rev. Lett. 93 073001 [12] Ortigoso J and Santos J 2005 Phys. Rev. A 72 053401 [13] Chi F P, Yang Y J, Huang Y X and Zhu Q R 2006 Chin. Rev.Lett. 23 1150 [14] Chu S I and Telnov D 2004 Phys. Rep. 390 1
2007, Vol. 24 
