Lasers can be used to drill or cut material. One such laser generates a series o

Question

Lasers can be used to drill or cut material. One such laser generates a series of high-intensity pulses rather than a continuous beam of light. Each pulse contains 490 mJ of energy and lasts 11 ns . The laser fires 10 such pulses per second. A) What is the peak power of the laser light? The peak power is the power output during one of the 11 ns pulses. _____Watts B) What is the average power output of the laser? The average power is the total energy delivered per second. _____Watts C) A lens focuses the laser beam to a 10 um diameter circle on the target. During a pulse, what is the light intensity on the target? _____W/m^2 D) The intensity of sunlight at the surface of the earth at midday is about 1100 W/m^2. What is the ratio of the laser intensity on the target to the intensity of the midday sun?

Explanation / Answer

You have done the hard part and stumbled at the easy one. In (c), you know the diameter of the area the focused laser beam is impinging on, so just devide the laser beam power by the area. Of course, you know how to do (d) once you have got (c). Good luck!

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