SPATIALLY ENCODED, SINGLE-SHOT ULTRAFAST SPECTROSCOPIES

We analyze the time-resolution constraints for two single-shot, time-r esolved femtosecond spectroscopic techniques, an excite-probe method, and a transient-grating method. For pulse lengths of tens of femtoseco nds, the former technique is shown to provide pulse-length-limited res olution for samples as much as hundreds of micrometers thick. The latt er technique is shown to provide nearly pulse-length-limited resolutio n under a variety of conditions, independent of the sample thickness.