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27 Nov 2019
A helium-neon laser (? = 633 nm), shown in Fig. P17.73, is builtwith a glass tube of inside diameter 1.0 mm. One mirror ispartially transmitting to allow the laser beam out. An electricaldischarge in the tube causes it to glow like a neon light. From anoptical perspective, the laser beam is a light wave that diffractsout through a 1.0-mm-diameter circular opening.
a. Explain why a laser beam canât be perfectly parallel, with nospreading.
b. The angle ?1 to the first minimum is called the divergence angleof a laser beam. What is the divergence angle of this laserbeam?
c. What is the diameter (in mm) of the laser beam after it travels3.0 m? d. What is the diameter of the laser beam after it travels1.0 km?
A helium-neon laser (? = 633 nm), shown in Fig. P17.73, is builtwith a glass tube of inside diameter 1.0 mm. One mirror ispartially transmitting to allow the laser beam out. An electricaldischarge in the tube causes it to glow like a neon light. From anoptical perspective, the laser beam is a light wave that diffractsout through a 1.0-mm-diameter circular opening.
a. Explain why a laser beam canât be perfectly parallel, with nospreading.
b. The angle ?1 to the first minimum is called the divergence angleof a laser beam. What is the divergence angle of this laserbeam?
c. What is the diameter (in mm) of the laser beam after it travels3.0 m? d. What is the diameter of the laser beam after it travels1.0 km?
