FRONT-ILLUMINATED FLUORESCENT SCREEN FOR UV IMAGING

摘要

In one embodiment of the invention, phosphor powder in a binder (28) is deposited on a flat first side (30) of a fused silica substrate (26). The UV output of a laser beam (14) is reflected off an angled beam splitter (16) so as to be incident upon a flat second side (32) of the fused silica substrate. The phosphor is energized by the UV light transmitted through the fused silica and re-radiates a visible wavelength (41). The binder is selected to be opaque to UV wavelengths so that only a thin layer, 10-20 microns, of the phosphor is energized by the incident UV beam. Since the energized phosphor layer against the first side of the substrate is extremely thin and flat, the energized phosphor produces a visible light which precisely corresponds to the incident UV light. The visible light may then be used to determine the characteristics of the UV beam.