Goos-Hänchen Shifts at 458 nm from DUV Dichroic Laser Mirrors

Shamaila Manzoor; Mauro Chiarotti; Paul J. Robert; Nicola Poli

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arXiv · 2611.08120

Goos-Hänchen Shifts at 458 nm from DUV Dichroic Laser Mirrors

Shamaila Manzoor·Mauro Chiarotti·Paul J. Robert·Nicola Poli

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Abstract

We report polarization- and angle-dependent lateral beam shifts observed at 458~nm upon reflection from a deep-ultraviolet (DUV) dichroic multilayer mirror. These Goos--Hänchen (GH) shifts originate from the phase of the complex Fresnel reflection coefficient and are quantitatively reproduced using a transfer-matrix model. Simultaneous reflectance (R), transmittance (T), and GH shift measurements provide complementary constraints on the coating's amplitude and phase response. The analysis is extended to transmission, predicting analogous phase-induced lateral shifts. In frequency-doubling cavities using dichroic mirrors, these phase effects can accumulate over multiple reflections, leading to deviations from ray-optics predictions that may affect cavity mode structure and resonance conditions. Our results show a GH shift of as much as 2~\textmu m (\bm{$\approx 4.4λ$}), which, combined with RT data, enables improved characterization of the phase response of the multilayer coating. The p-polarized reflectance is minimized at a pseudo-Brewster angle of \bm{$θ_B \approx 46^\circ$} at 458~nm, providing a natural reference point around which the GH shift is enhanced.

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Shamaila Manzoor, Mauro Chiarotti, Paul J. Robert, Nicola Poli. 2026-11-05. Goos-Hänchen Shifts at 458 nm from DUV Dichroic Laser Mirrors. https://arxiv.org/abs/2611.08120

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