Theoretical Analysis of Fiber Arrangements for Improved Coupling Efficiency in the VBT High-Resolution Echelle Spectrograph

TL;DR

This paper provides a theoretical analysis of fiber arrangements to improve coupling efficiency in high-resolution spectrographs, aiming to increase flux capture without sacrificing spectral resolution.

Contribution

It introduces a comprehensive theoretical simulation approach to optimize fiber configurations for better flux coupling in high-resolution astronomical spectroscopy.

Findings

Optimal fiber arrangements can significantly enhance flux coupling efficiency.

Theoretical models suggest potential improvements in spectrograph performance.

Strategies to balance flux capture and spectral resolution are identified.

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.