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Experimentally calculating the wavelength of an He-Ne laser by means of diffraction gratings
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EXPERIMENTALLY CALCULATING THE WAVELENGTH OF A He-Ne LASER BY MEANS OF DIFFRACTION GRATINGS Purpose: To experimentally determine the wavelength of a He-Ne laser, by means of three different diffraction gratings - 600 lines/mm, 300 lines/mm, and 100 lines/mm. Background Information: "The deviation of light from its original path as it passes through a narrow opening or around an obstruction is called diffraction."1 When light is pointed through one slit, the light is diffracted and creates an "interference pattern" on a screen a certain distance away. On this screen, various "fringes" of light are displayed through destructive interference, along with a bright vertical beam of light in the center. The fringes are less bright beams of light on either side of the central beam - the first fringes on either side are called "first order fringes," the second fringes on either side are called "second order fringes," and so on. Theoretically, the distances from the...
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