Abstract:
In fiber-based spectroscopy within telescopes, a prevailing limitation has been the necessity to align the fiber
diameter with the telescope’s seeing conditions, often characterized by the Full Width at Half Maximum of the
point spread function. This alignment constraint captures around 50 % of the incoming flux from any point
source. Furthermore, the challenge is compounded when high-resolution spectroscopy is in play, as it often
demands a minute slit width, further exacerbating flux loss. The essence of this paper lies in a comprehensive
exploration, accomplished through theoretical simulations, of strategies aimed at enhancing the coupling
efficiency of high-resolution spectrographs. The primary objective is to bolster the flux capture without compromising the critical aspect of spectral resolution. This research endeavors to unlock the potential for more effective utilization of high-resolution spectrographs to study celestial objects.
