A helium-neon laser emits light that has a wavelength of 632.8 nm. The circular aperture through which the beam emerges has a diameter of 0.500 cm. Estimate the diameter of the beam 10.0 km from the laser.

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Ankit LalLv10

21 Nov 2020

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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.

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