Experimental observation of vibrations produced by pulsed laser beam in MgO : Fe-57

摘要

We report the first observation of a laser-produced vibration with the aid of Mossbauer techniques. Thin platelets of MgO single crystals were doped by diffusion of Fe-57 atoms. The illumination of the MgO:Fe-57 sample with a pulsed Nd:YAG laser produced a significant broadening of the Mossbauer spectrum. In order to find out what caused these changes, we performed a series of time-domain experiments, in which the Mossbauer spectra were collected only during a 2.5 mu s gate interval. This gate interval was swept from 5 mu s to 190 mu s over the time interval between the two laser pulses. After laser irradiation, the position of the Mossbauer line was found to be changing in time as a decaying oscillations of well-defined frequency, which can be due to the vibration of the sample induced by the laser pulse.