A helium-neon laser (A = 633 nm), shown in Figure P 17 .7
Chapter 17, Problem 71(choose chapter or problem)
A helium-neon laser (A = 633 nm), shown in Figure P 17 .7 1,is built with a glass tube of inside diameter 1.0 mm. One mirroris partially transmitting to allow the laser beam out. Anelectrical discharge in the tube causes it to glow like a neonlight. From an optical perspecti ve, the laser beam is a lightwave that diffracts out through a J .0-mm-diameter circularopening.a. Explain why a laser beam can't be pe1fectly parallel, with nospreading.b. The angle 01 to the first minimum is called the divergenceangle of a laser beam. What is the divergence angle of thislaser beam?c. What is the diameter (in mm) of the laser beam after ittravels 3.0 m?d. What is the diameter of the laser beam after it travels1.0 km?
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