Optical gratings induced by field-free alignment of molecules

Details Optical gratings induced by field-free alignment of molecules Optical gratings induced by field-free alignment of molecules

2006-09-20

arxiv.org/abs/quant-ph/0609155v1

Physics

Quantum Physics

10 pages, 5 figures, submitted to PRA

Scientific paper

10.1103/PhysRevA.75.013419

We analyze the alignment of molecules generated by a pair of crossed ultra-short pump pulses of different polarizations by a technique based on the induced time-dependent gratings. Parallel polarizations yield an intensity grating, while perpendicular polarizations induce a polarization grating. We show that both configurations can be interpreted at moderate intensity as an alignment induced by a single polarized pump pulse. The advantage of the perpendicular polarizations is to give a signal of alignment that is free from the plasma contribution. Experiments on femtosecond transient gratings with aligned molecules were performed in CO2 at room temperature in a static cell and at 30 K in a molecular expansion jet.

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