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One of your assumptions is incorrect: there is no need to have any "round-trip" phase match. All the photons (or wavefronts) just keep reflecting off the mirror surface. The reflections will always contain a vector component in the longitudinal direction (parallel to the axis of the fiber), so all the light will end up at the far end of the fiber, ...


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As a guess, you might be picking up some fluorescence. Fluorescence absorbs light with a shorter wavelength and reemits is at a longer wavelength. Blue to green fluorescence is pretty common, but you are unlikely to notice it since the fluoresced color is so low compared to the excitation light. The room has to be dark and the excitation light needs to be a ...


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