Tailoring resonator geometry for astigmatism compensation with structured light in birefringent optical cavities
Abstract
In this work, we experimentally investigate the astigmatism induced by a birefringent crystal inside an optical cavity and demonstrate a geometric compensation strategy for structured modes carrying orbital angular momentum (OAM). We show that the astigmatism observed in the semimonolithic configuration can be fully compensated by introducing a third mirror to fold the cavity, thereby exploiting the geometric astigmatism arising from oblique incidence on the curved mirror. By performing a study of the resonator geometry, both theoretical and experimental results confirm that this approach enables the preservation of OAM between the pump beam and the converted signal and idler modes, providing an effective design strategy for birefringent optical cavities.
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BibTeX
@misc{jr2026tailoring,
title = {{Tailoring resonator geometry for astigmatism compensation with structured light in birefringent optical cavities}},
author = {J. C. de Carvalho Jr. and R. F. Barros and A. Z. Khoury and C. E. R. Souza and G. B. Alves},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.08575},
eprint = {2611.08575},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.08575},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Tailoring resonator geometry for astigmatism compensation with structured light in birefringent optical cavities
AU - J. C. de Carvalho Jr.
AU - R. F. Barros
AU - A. Z. Khoury
AU - C. E. R. Souza
AU - G. B. Alves
PY - 2026
DA - 2026/11/05
PB - arXiv
DO - 10.48550/arxiv.2611.08575
UR - https://arxiv.org/abs/2611.08575
AB - In this work, we experimentally investigate the astigmatism induced by a birefringent crystal inside an optical cavity and demonstrate a geometric compensation strategy for structured modes carrying orbital angular momentum (OAM). We show that the astigmatism observed in the semimonolithic configuration can be fully compensated by introducing a third mirror to fold the cavity, thereby exploiting the geometric astigmatism arising from oblique incidence on the curved mirror. By performing a study of the resonator geometry, both theoretical and experimental results confirm that this approach enables the preservation of OAM between the pump beam and the converted signal and idler modes, providing an effective design strategy for birefringent optical cavities.
ER -