Proceedings PaperThermal stability of excimer laser-written fiber Bragg gratings as a function of fiber/phase mask distance
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Previous work has demonstrated that the thermal stability of Fiber Bragg gratings can be influenced by pre- or postirradiation of the grating with uniform (non-modulated) light, thereby changing the grating contrast (or modulation index). We present new experimental results about the thermal stability of gratings where the contrast is determined by the fiber-phase mask distance during the irradiation with excimer laser light. Due to the low spatial coherence of the excimer laser light, the fringe contrast behind the mask drops from near 100% to less than 10% over 1 mm.