Page 238 - Photonics Essentials an introduction with experiments
P. 238
Measurements in Photonics
232 Characterizing Photonic Devices in the Laboratory
Focussing
mirrors
(a)
(b)
Figure 10.5. (a) A schematic diagram of the light path through a grating monochroma-
tor. Light focused on the input slit is analyzed for wavelength by the grating and refo-
cused on the exit slit. (b) A demonstration of how light that enters a spectrometer is dis-
persed in wavelength by the grating so that the exit slit selects only a narrow range of
wavelengths that can exit the spectrometer.
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