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A simple technique for in situ measurements of pulsed Gaussian-beam spot sizes is reported. This technique is particularly useful for measurements on highly focused beam spots. It can also be used for absolute calibration of the threshold-energy fluences for pulsed-laser-induced effects. The thresholds for several effects in picosecondlaser-induced phase transformation on silicon-crystal surfaces are calibrated with this technique.
J. M. Liu (Sat,) studied this question.
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