Over 500 pulses transmitted from a ground-based Nd:YAG laser were detected in Mars orbit, at with the MOLA instrument on-board the Mars Global Surveyor spacecraft on September 28, 2005, at distance of 80.1 Mkm.

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Since the resistivity of PVDF films increases when the films are p<>-Ied , the voltage across the samples must be increased during the poling process in order to keep the current coudaht . Under these conditions we observe the formation of a polarization zone in the center of the film depth. The thickness of the polarintion free zone dose to the film sur~ (;U;e8 is found to decrea."Ie with huger CUHent densities. The results are consistent with a model assuming charge trapping in deep traps associated with the orientation of pola.r crystallite1l.

No abstract