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Using a Power Meter to Detect Unwanted Fluorescence in a Filter

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Using a Power Meter to Detect Unwanted Fluorescence in a Filter

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Absorptive glass filters have varying degrees of non-trivial fluorescence, which can be problematic in some applications. Here’s a fairly simple way to check if a filter is fluorescing: Place the filter in a collimated beam with a power meter behind it, located very close to the filter and measure the signal., Increase the distance (>> 10x the beam diameter) from the filter to the power meter and measure again the signal.

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