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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 9.855 ns long and carry an energy of 1.98 mJ each.
1. What is the power during one these pulses? (W)
2. 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)
3. If the radiation has a wavelength of 350 nm, what is the electric field amplitude during a pulse? (V/m)
A helium-neon laser emits light of wavelength 632.8 nm and has a power output of 4.0 mW. How many photons are emitted per second by this laser
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