When was the first laser constructed?
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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.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?
Red laser light from a He-Ne laser ( ) creates a second-order fringe at After passing through the grating. What is the wavelength of light that creates a first-order fringe at
A laser with wavelength d/8 is shining light on a double slit withslit separation 0.400 mm. This results in an interference patternon a screen a distance away from the slits. We wish to shine asecond laser, with a different wavelength, through the sameslits.What is the wavelength lambda 2 of the second laser that wouldplace its second maximum at the same location as the fourth minimumof the first laser, if d= 0.400mm ?Express your answer in millimeters.lambda 2(subscribe)
