![]() The diffraction efficiency is a value that expresses the extent to which energy can be obtained from diffracted light with respect to the energy of the incident light. It is also possible to deal with overlapping by changing detectors. For example, when using first-order light with wavelengths in the range 350 to 800 nm, a filter is used to cut the overlapping second-order light with wavelengths in the range 350 nm to 400 nm, in other words, to cut light with wavelengths of 400 nm or less. If the applied wavelength region is wider than the free spectral range, spectra corresponding to the unrequired orders must be removed from the overlapping region. 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. 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.
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