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UV Optics: Tighter Tolerances and Different Materials

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UV Optics: Tighter Tolerances and Different Materials

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Relative performance will be worse at short UV wavelengths. For instance, a lens used at 308nm will require an irregularity tolerance twice as tight as a lens used at 632.8nm to maintain the same relative level of wavefront distortion. This same principle also applies to optical coatings. The thickness of simple coatings are typically specified to quarter or half wavelengths of light. For UV coatings, the deposition process requires much more accurate monitoring; small fluctuations in production results in much greater errors in the UV than they would in the visible or IR spectra.

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