摘要High-order harmonic generations from a one-dimensional Coulomb potential atom are calculated with the initial state prepared as a coherent superposition between its ground and first excited states. When the energy difference of the two states is small, we can choose proper laser pulse such that the first excited state can be excited only to other bound states instead of being ionized. We show that only the hyper-Raman lines are observable instead of the harmonics. The energy difference of the ground and the first excited state can be deduced from the highest peak of the hyper-Raman lines. We further show that the similar results can be obtained by using a combination of two laser pulses with different frequencies interacting with the atom initially at the ground state.
Abstract：High-order harmonic generations from a one-dimensional Coulomb potential atom are calculated with the initial state prepared as a coherent superposition between its ground and first excited states. When the energy difference of the two states is small, we can choose proper laser pulse such that the first excited state can be excited only to other bound states instead of being ionized. We show that only the hyper-Raman lines are observable instead of the harmonics. The energy difference of the ground and the first excited state can be deduced from the highest peak of the hyper-Raman lines. We further show that the similar results can be obtained by using a combination of two laser pulses with different frequencies interacting with the atom initially at the ground state.
[1] Papadogiannis N A, Witzel B, Kalpouzos C andCharalambidis D 1999 Phys. Rev. Lett. 83 4289 [2] Burnett K, Reed V C, and Knight P L 1993 J. Phys. B 26 561 [3] Yang Y J, Chen G, Chen J G, and Zhu Q R 2004 Chin. Phys.Lett. 21 652 [4] Corkum P B 1993 Phys. Rev. Lett. 71 1994 [5] Kulander K C, Schafer K J, and Krause J L 1991 Phys. Rev.Lett. 66 2601 [6] Watson J B, Sanpera A, Chen X, and Burnett K 1996 Phys.Rev. A 53 R1962 [7] Wang B B, Chen T W, Li X F, and Fu P M 2004 Chin. Phys.Lett. 21 1727 [8] Millack T and Maquet A 1993 J. Mod. Opt. 40 2161 [9] Piazza A D and Fiordilino E 2001 Phys. Rev. A 64 013802 [10] Pins M L, Ta\"{\ib R, and Maquet A 1996 Phys. Rev. A 54 3634 [11] Feit M D, Fleck J A, Jr, and Steiger A, J. Comp. Phys 47 412(1982) [12] Javanainen J, Eberly J H, and Burnett K 1988 Phys. Rev.A 38 3430 [13] Liu W C and Clark C W 1992 J. Phys. B 25 L517 [14] Gordon A, Santra R, and K\"artner F X 2005 Phys. Rev. A 72 063411 [15] Rae S C, Chen X, and Burnett K 1994 Phys. Rev. A 50 1946 [16] Watanbae S, Kondo K, Nabekawa Y, Sagisaka A, and Kobayashi Y1994 Phys. Rev. Lett. 73 2692 [17] Qu W X, Gan M L, Xia Y X, Li R X, Xu Z Z 2001 Chin.Phys. Lett. 18 1047 [18] Chen G, Chen J G, Yang Y J, Zhu H Y, Du W H, Chi F P, and ZhuQ R 2005 Chin. Phys. Lett. 22 584
2007, Vol. 24 
