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• W2085245730 abstract "Due to their high efficiency and broad operational bandwidths, volume phase holographic gratings (VPHGs) are oftenthe grating technology of choice for astronomical instruments, but current VPHGs exhibit a number of drawbacksincluding limits on their size, function and durability due to the manufacturing process. VPHGs are also generally madeusing a dichromated gelatine substrate, which exhibits reduced transmission at wavelengths longer than ~2.2 μm,limiting their ability to operate further into the mid-infrared.An emerging alternative method of manufacturing volume gratings is ultrafast laser inscription (ULI). This techniqueuses focused ultrashort laser pulses to induce a localised refractive index modification inside the bulk of a substratematerial. We have recently demonstrated that ULI can be used to create volume gratings for operation in the visible,near-infrared and mid-infrared regions by inscribing volume gratings in a chalcogenide glass. The direct-write nature ofULI may then facilitate the fabrication of gratings which are not restricted in terms of their size and grating profile, as iscurrently the case with gelatine based VPHGs.In this paper, we present our work on the manufacture of volume gratings in gallium lanthanum sulphide (GLS)chalcogenide glass. The gratings are aimed at efficient operation at wavelengths around 1 μm, and the effect of applyingan anti-reflection coating to the substrate to reduce Fresnel reflections is studied." @default.
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• W2085245730 date "2014-08-19" @default.
• W2085245730 modified "2023-09-26" @default.
• W2085245730 title "Developing ultrafast laser inscribed volume gratings" @default.
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• W2085245730 doi "https://doi.org/10.1117/12.2055882" @default.
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