Seminars at FGG

The Complex Fabrication of Silicon Grisms. Toward an Easy Way to Implement an High Resolution Spectroscopic Mode in Simple Imagers.

Speaker: Fabrizio Vitali (INAF-Oss.Astronomico di Roma)

Date and time: 2013-05-15 11:30

Since more than a decade, in INAF-Astronomical Observatory of Rome started a technological collaboration with the CNR-Istituto di Fotonica e Nanotecnologie in Rome (IFN, ex CNR-IESS) for the realization of silicon grisms, aiming at providing a high resolution spectroscopic mode any infrared imager, and, in particular, the Near Infrared camera-spectrometer NICS at the National GALILEO telescope (TNG) . Here, we present the results of our project for the design, construction and on-sky tests of silicon grisms. Silicon Grisms are optical devices, that provide a medium-high resolution spectroscopic mode in imaging instruments, without introducing major changes in instrument configuration. After some critical phases during the experimentation, a silicon grism has been eventually fabricated and inserted in the filter wheel of the Near Infrared camera NICS, at the focal plane of the National Galileo Telescope (TNG), the 3.5 m Italian facility at the Canary Islands (E).