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By Chandana Sinha, Shibshankar Bhattacharyya

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6 Attosecond pulse intensity I(t) in W cm"2 plotted against time(as) for both symmetric DWO (dotted line) given by Eq. (8) and asymmetric DWO(solid line) given by Eq. (9) (Reproduced from [38] by permission from the American Institute of Physics). 5). We also examined the applicability of the high harmonics for generation of attosecond pulses (Fig. 6). An inverse Fourier synthesis performed over a window of spectral components near the middle or end of the plateau region of the harmonics for both asymmetric and symmetric DWOs resulted in the generation of 380 and 390 as pulses respectively.

3a,3c), tremendous losses ensued and very few atoms remained near the end of the evaporation ramp. However, when it was correctly aligned, as in Fig. 3b, we obtained a huge increase in probe absorption, an unmistakable signature that the hole had been successfully plugged and that we could produce a BEC. 4. ,t) that satisfies the Gross-Pitaevskii equation 19 . f c d* fi2 2m 2 t(x,t)+g\®\ # where H = J^ is the reduced Planck constant, m is the atomic mass and Vext is the sum of all external potentials including the trapping potential.

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