Lasers are used extensively in eye surgery to remove unwanted material from the
ID: 3899708 • Letter: L
Question
Lasers are used extensively in eye surgery to remove unwanted material from the eye or reshape the eye lens. These lasers use pulses of very intense radiation to literally blast away material. The pulses are generally 11.507 ns long and carry an energy of 2.15 mJeach. What is the power during one these pulses?
=___W
If this energy is delivered to a spot on the eye that is 1.0 mm in diameter, what is the intensity during a pulse?
=____W/m^2
If the radiation has a wavelength of 350 nm, what is the electric field amplitude during a pulse?
=____V/m
Explanation / Answer
Energy per pulse = 2.15 (mJ) = 2.15e-3 (J)
Duration per pulse = 11.507 (ns) = 1.1507e-8 (s)
Power = energy/duration = 2.15e-3/1.1507e-8 = 186842.8 W
Intensity = Power/area = 186842.8/(?(5e-4)^2) = 2.379 x 10^11 (W/m^2)
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