7.Calculate the power per unit area delivered by a laser pulse of energy 4.0 m] and the pulse length in time as 10'9sec. When the
7.Calculate the power per unit area delivered by a laser pulse of energy 4.0 m] and the pulse length in time as 10'9sec. When the pulse is focussed on a target to a very small spot of radius 1.5 x 10'5m. (use the relation I=P/A)
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