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Laser Tuning with Diffraction Gratings

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Laser Tuning with Diffraction Gratings

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Light incident on a diffraction grating is dispersed away from the grating surface at an angle which depends on the wavelength, so a grating can be used to select a narrow spectral band from a much wider band. There are two main methods for selecting a narrow spectral band of light, Littrow and Littman. These methods are shown in Figures 2 and 3. Littman tuning offers higher angular spread and hence narrower spectral feedback; as the angle of incidence is increased toward 90°, however, the efficiency of the grating drops significantly.

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