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Introduction to the Fluorescence Detector Optical Unit 1 Optical Unit All the elements of the optical system, shown in Figure 6 on page 16, including Xenon flash lamp, excitation condenser, excitation slit, mirror, excitation grating, flow cell, emission condenser, cut-off filter, emission slit, emission grating and photo-multiplier tube are housed in the metal casting inside the detector compartment. The fluorescence detector has grating/grating optics, enabling the selection of both excitation and emission wavelengths. The flow cell can be accessed from the front of the fluorescence detector. Agilent 1260 FLD User Manual 15