Question
Question: A laser beam of pulse power 10<sup>12</sup> watt is focused on an object area 10<sup>–4</sup> cm<sup...
A laser beam of pulse power 1012 watt is focused on an object area 10–4 cm2. The energy flux in watt/ cm2 at the point of focus is
A
(a) 1020
A
(b) 1016
A
(c) 108
A
(d) 104
Explanation
Solution
(b)
Sol. The energy flux φ=Area Pulse power =10−41012=1016cm2W