Goos-H\"anchen and Imbert-Fedorov shifts for astigmatic Gaussian beams

TL;DR

This paper examines how beam astigmatism affects the Goos-H"anchen and Imbert-Fedorov shifts, revealing that astigmatism can enhance the angular component of these optical beam shifts.

Contribution

It provides explicit calculations of how astigmatism modifies standard beam shift formulas, highlighting the role of astigmatism in optical beam behavior.

Findings

Astigmatism can significantly enhance the angular shift component.

Explicit corrections to standard formulas are derived for astigmatic Gaussian beams.

Astigmatic lenses influence the magnitude of beam shifts in focused Gaussian beams.

Abstract

In this work we investigate the role of the beam astigmatism in the Goos-H\"anchen and Imbert-Fedorov shift. As a case study, we consider a Gaussian beam focused by an astigmatic lens and we calculate explicitly the corrections to the standard formulas for beam shifts due to the astigmatism induced by the lens. Our results show that astigmatism may enhance the angular part of the shift.