Large size VPHGs@INAF: new facility and perspectives

Le résumé fourni par la source

Volume Phase Holographic (VPH) technology is crucial in modern ground-based astronomical spectrographs due to high diffraction efficiency, tunability, and robustness. At INAF–Astronomical Observatory of Brera, we focus on the design and fabrication of VPHGs for diverse instruments. Next-generation facilities require large-format VPHGs, up to half a meter, for instruments such as MOSAIC (ELT), HRMOS (VLT), and WST, demanding scalable, precise production processes. At INAF–OABr, we developed a reliable manufacturing process ensuring control of diffraction efficiency, wavefront quality, and dispersion. A new holography laboratory, with a 450 mm aperture writing setup, allows production of VPHGs up to 450×600 mm (vertical and dispersion directions, respectively). Initial results demonstrate the capabilities and future potential for large-format gratings in advanced spectrographs.

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