THZ COMMENSURATE ECHOES - PERIODIC REPHASING OF MOLECULAR-TRANSITIONS IN FREE-INDUCTION DECAY

被引:104
作者
HARDE, H
KEIDING, S
GRISCHKOWSKY, D
机构
[1] UNIV BUNDESWEHR,W-2000 HAMBURG 70,GERMANY
[2] ODENSE UNIV,INST PHYS,DK-5230 ODENSE,DENMARK
关键词
D O I
10.1103/PhysRevLett.66.1834
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report the first study of coherent transients excited by ultrafast pulses of THz radiation. Using a newly developed optoelectronic source of well-collimated beams of subpicosecond pulses of THz radiation to excite N2O vapor, we have observed the subsequent emission from the vapor of coherent THz pulse trains extending to as long as 1 nsec. The origin of these subpicosecond THz pulses (echoes) is a periodic rephasing, during the free-induction decay, of the more than fifty coherently excited rotational lines with commensurate transition frequencies. From the decay and reshaping of the echoes the coherent relaxation time T2 and the anharmonicity factor for the N2O molecule are evaluated.
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页码:1834 / 1837
页数:4
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