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Useful Wavelength Range of Diffraction Grating

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Useful Wavelength Range of Diffraction Grating

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The laws governing diffracted efficiency are quite complicated, but a very rough rule of thumb can be used to estimate the useful range of wavelengths available on either side of the blaze (peak) wavelength for triangular-groove gratings.For coarse gratings (for which d ≥ 2λ), the efficiency in the first diffraction order is roughly half its maximum (which is at λB) at 2λB/3 and 3λB/2. Curves of similar shape are obtained in the second and third orders, but the efficiencies are typically 20% less everywhere, as compared with the first order.Grating of fine pitch (d ≈ λ) have a somewhat lower peak efficiency than do coarse gratings, though the useful wavelength range is greater.

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