Position tunable volume reflection gratings for narrowband filtering applications (FWHM < 5 nm) in optical fibre systems

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Abstract
We report a significant improvement in the performance of position-tuned volume reflection gratings in dichromated gelatin for fibre-based applications in the 1200–1600 nm range. Full widths at half-maximum of less than 5 nm have been obtained over the whole tuning range, with high peak efficiencies for DCG films of 410 μm thickness. These films are considerably thicker than have been reported elsewhere for IR or visible wavelength devices.