Optical Design of a Fiber-Fed IFU Spectrograph for the DAG Telescope

Date

2023-9-05

Author

Sipahi, Tarik

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The main objective of this study is to provide an optical design of a spectrograph in the intermediate spectral resolution range (R>1000) while ensuring a high optical throughput. The study explores the use of an integral field unit (IFU) that combines imaging and spectroscopy and generates the spectrum of two-dimensional content. For the IFU design, hexagonally packed microlens arrays are used which are followed by 61 fibers showing the best filling efficiency while enabling a spatial coverage of the broadest conceivable content. A code was developed to run Rigorous Coupled-Wave Analysis (RCWA) calculations to determine the optimum parameters of the volume-phase holographic grating that achieves high diffraction efficiency with the widest possible FWHM of spectral coverage. The code includes the calculation for the basic parameters of the spectrograph's optical elements and the results are verified over OpticStudio/ZEMAX software. The proposed design is finalized with three Volume-Phase Holograph Grating (VPH) based spectral arms covering the visible and near-infrared spectral regions.

Subject Keywords

Spectrograph, Optical Design, Instrumentation, Astronomy, IFU, VPH Grating

URI

https://hdl.handle.net/11511/105289

Collections

Graduate School of Natural and Applied Sciences, Thesis