We experimentally observed that the dependence of energy exchange between a delay-tuned probe beam and two delay-fixed pump ones on the relative time delay could be extended to 100 picoseconds. These two pump beams were always spatiotemporally overlapped, leading to a one-dimensional plasma grating. The energy exchange process involving filamentation has been attributed to two retarded nonlinear responses consisting of the rotational Raman effect and the formation of plasma. However, the characteristic time of Raman effect is in the order of 70 femtoseconds, which is much shorter that the time scale of 100 picoseconds we concerned. So, the first effect could be neglected and only the plasma formation could contribute to the elongation of the energy exchange process. But in detail, how does the plasma formation influence the energy exchange process and how to do simulation on it?
I suggest you to have a look at these two articles dealing with the subject:
Physical Review Letters 105, 055003 (2010)
Physical Review E 86, 036405 (2012)
Dear Bengji,
Please read this paper
http://hal.archives-ouvertes.fr/docs/00/51/05/93/PDF/author_proof_PRL_Liu_2010.pdf
then comment :-)
I have read these two important articles about energy exchange. In the article of PRL 105, 055003 (2010), the profile of energy exchange as a function of the relative time delay is symmetrical near the zero point. However, it is asymmetrical in our results, which can be referred in the attachment Graph1.eps. The existed theory and simulation in the artcile (PRL 105, 055003 (2010)) didn't provide a viable solution. So,it is time for expanding the existing theory by considering the contribution of plasma grating formation.
There are a lot of problems with the plasma in the filamentation process.
On the Second Filamentation Conference in Create 2010 Liu reported for such profile of exchange of the energy.
I ask him for the intensities of the pulses and the answer was that they are of order of 10^(12) W/cm^2. Than we (and Prof. J-C Diels) discuss that for such low intensity the plasma can not perform a grid and is too little to influence also. New mechanism need to be found.
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