What is the average power of each laser pulse?
Question by Bella: What is the average power of each laser pulse?
A LASIK vision correction system uses a laser that emits 10 ns-long pulses of light, each with 2.5 mJ of energy. The laser is focused to a 0.85 mm-diameter circle.
What is the average power of each laser pulse?
What is the electric field strength of the laser light at the focus point?
Best answer:
Answer by billrussell42
power = 2.5 mJ / 10ns = 0.25 MW = 250 kW
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A 0.85 diameter beam has an area of 0.57 mm^2. Therefore, when ON, the average laser power is
2.5E(-3)/(10E(-9)*0.57)
= 0.44 MW/(mm^2)
P = energy/t = 0.0025/1E-8 = 250000 W
I(ave) = P/A = 250000/(pi*0.425E-3^2) = 4.4056732E11 W/m^2
I(peak) = 2I(ave) = 8.8113463E11 W/m^2
Electric field E = sqrt(I(peak)*Z0) = 1.8219499E7 V/m, where
free-space impedance Z0 = sqrt(µ0/e0) = 376.73031 ohms