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13 December 2020 Optical aspects of Near-Infrared Imager Spectrometer and Polarimeter instrument (NISP)
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Abstract
As a Near- IR instrument to PRL's upcoming 2.5 m telescope, NISP is designed indigeniously at PRL to serve as a multifaceted instrument. Optical, Mechanical and Electronics subsystems are being designed and developed in-house at PRL. It will consist of imaging, spectroscopy and imaging-polarimetry mode in the wavelength bands Y, J, H, Ks i.e. 0.8 - 2.5 µm. The detector is an 2K x 2K H2RG (MCT) array detector from Teledyne, which will give a large FOV of 10' x 10' in the imaging mode. Spectroscopic modes with resolving power of R ~ 3000, will be achieved using grisms. Spectroscopy will be available in single order and a cross-dispersed mode shall be planned for simultaneous spectra. The instrument enables multi-wavelength imaging- polarimetry using Wedged-Double Wollaston (WeDoWo) prisms to get single shot Stokes parameters (I, Q, U) for linear polarisation simultaneously, thus increasing the efficiency of polarisation measurements and reducing observation time.
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Archita Rai, Shashikiran Ganesh, Sukamal K. Paul, Prashanth K. Kasarla, Prachi V. Prajapati, Deekshya R. Sarkar, Alka Singh, Pitambar S. Patwal, Hitesh K. L. Adalja, Satya N. Mathur, Sachindra Naik, Amish B. Shah, and Kiran S. Baliyan "Optical aspects of Near-Infrared Imager Spectrometer and Polarimeter instrument (NISP)", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 1144765 (13 December 2020); https://doi.org/10.1117/12.2560988
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