P1) Lasers can be used to drill or cut material. One such laser generates a seri

Question

P1) 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 0.500 J of energy and lasts 10 nanoseconds. The laser fires tenpulses per second. a. What is the power of the laser light during oneof the pulses? b. What is the average power of the laser (ie. thetotal energy delivered per second)? c. A lens focuses the laser beam to a circularspot 10. m in diameter. What is the light intensity? d. What is the ratio of the laser intensity on thetarget to the intensity of the sun at midday (which is about 1100 W/m2) P1) 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 0.500 J of energy and lasts 10 nanoseconds. The laser fires tenpulses per second. a. What is the power of the laser light during oneof the pulses? b. What is the average power of the laser (ie. thetotal energy delivered per second)? c. A lens focuses the laser beam to a circularspot 10. m in diameter. What is the light intensity? d. What is the ratio of the laser intensity on thetarget to the intensity of the sun at midday (which is about 1100 W/m2)

Explanation / Answer

a) P = E / t = .5 / 10-8 = 5 * 10E7 W b) Psec = 10 * .5 / 1 = 5 W c) I = E / (A *t)          A = * (5 * 10E-6)2 = 7.85 * 10E-11 m2     I = 5 / 7.85 * 10E-11 = 6.37 * 10E10 W/ m2 d)   ratio = 6.37 * 10E10 / 1.1 * 10E3 = 5.79 *10E8 d)   ratio = 6.37 * 10E10 / 1.1 * 10E3 = 5.79 *10E8

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