Suppose-probably about right for the experiment as performed-that the laser was
ID: 1507440 • Letter: S
Question
Suppose-probably about right for the experiment as performed-that the laser was firing 20 mJ pulses, each with a time width of 10 ns. Approximating each pulse as rectangular in time, determine the peak power of a pulse in watts. By contrast, note that a continuous laser putting out 20 W (both peak power and average power, since continuous) would be considered a monster. These days fs pulsed laser systems arc becoming increasingly common. Suppose that a fs laser puts out pulses of 2 mJ-note lOx less pulse energy than the ns laser case-now with 50 fs pulse duration. Assuming again a square wave pulse, determine the peak power in watts. From the numbers in this problem, it should be clear why even relatively low energy fs pulses can initiate physical processes that higher energy ns pulses cannot, due to normously greater peak powers.Explanation / Answer
a) peak power = 20*10-3/10*10-9 + 20 = 2*106 + 20 = 2000020 W
b) peak power = 2*10-3/50*10-15 = 0.04*1012 W
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.