A wavefront rotator with near-zero mean polarization change

• URL: http://arxiv.org/abs/2405.10804v1
• Date: Fri, 17 May 2024 14:20:17 GMT
• Title: A wavefront rotator with near-zero mean polarization change
• Authors: Suman Karan, Nilakshi Senapati, Anand K. Jha,
• Abstract summary: A K-mirror is a device that rotates the wavefront of an incident optical field. The accompanying polarization changes in the transmitted field due to rotation persist even in the commercially available K-mirrors. We show in this article that it is possible to design a K-mirror at any given base angle and with any given value for the mean polarization change.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: A K-mirror is a device that rotates the wavefront of an incident optical field. It has recently gained prominence over Dove prism, another commonly used wavefront rotator, due to the fact that while a K-mirror has several controls for adjusting the internal reflections, a Dove prism is made of a single glass element with no additional control. Thus, one can obtain much lower angular deviations of transmitting wavefronts using a K-mirror than with a Dove prism. However, the accompanying polarization changes in the transmitted field due to rotation persist even in the commercially available K-mirrors. A recent theoretical work [Applied Optics, 61, 8302 (2022)] shows that it is possible to optimize the base angle of a K-mirror for a given refractive index such that the accompanying polarization changes are minimum. In contrast, we show in this article that by optimizing the refractive index it is possible to design a K-mirror at any given base angle and with any given value for the mean polarization change, including near-zero values. Furthermore, we experimentally demonstrate a K-mirror with an order-of-magnitude lower mean polarization change than that of the commercially available K-mirrors. This can have important practical implications for OAM-based applications that require precise wavefront rotation control.

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