As briefly described in the section on grating equations, however, it is necessary to use an appropriate groove density for light of wavelength λ 2 at long-wavelength side, in this case 700 nm, to be obtained as diffracted one. When using second-order light, the free spectral range is from 350 to 525 nm. The range 350 to 700 nm is the free spectral range. The two aspects of the grating intensity relationship can be illustrated by the diffraction from five slits.For example, when using first-order light with wavelengths greater than or equal to 350 nm, wavelengths up to 700 nm can be used without overlapping. Such a multiple-slit is called a diffraction grating. When you have 600 slits, the maxima are very sharp and bright and permit high-resolution separation of the maxima for different wavelengths. If a 1 mm diameter laser beamstrikes a 600 line/mm grating, then it covers 600 slits and the resulting line intensity is 90,000 x that of a double slit.Īs the intensity increases, the diffraction maximum becomes narrower as well as more intense. Increasing the number of slits not only makes the diffraction maximum sharper, but also much more intense. The grating intensity expression gives a peak intensity which is proportional to the square of the number of slits illuminated. Diffraction Grating Intensities Grating Intensity Comparison
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