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3 Color Laser Array Through Diffraction Grating


Three lasers of different wavelength each pass through the same diffraction grating. Angle of diffraction differs for each color.

There are three lasers, 405nm (Blue), 532nm (Green), and 650nm (Red). When coherent light passes through a diffraction grating, the light forms local maxima aligned with the horizontal plane (given that the grating is aligned vertically). The angle to the maxima is dependent on the wavelength of the coherent light passing through, and the distance between the slits in the grating. It turns out the relation is the following: d sin(') = n' Where “d” is the distance between slits in the grating, “'” is the angle from the center to the respective maxima, “n” is the order of maxima in question, and “'” is the wavelength of the light. The central maxima has n=0, and the first maxima on each side of the central maxima is referred to as the maxima of “order 1.” [URL=“”][/URL] Updated Jan 17 2017





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demonstrations/6_optics/6c_diffraction/3_color_laser_array_through_diffraction_grating/start.1550190717.txt.gz · Last modified: 2019/02/15 00:31 by demoroom