Polarisation compensation in non-planar image-rotating OPO ring resonators

Author:

Piotrowski MarcinORCID,Schellhorn Martin,Spindler Gerhard1,Medina Manuel A.ORCID,Müller Christian W.,Bigotta Stefano,Hildenbrand-Dhollande Anne

Affiliation:

1. Untere Gaisäckerstr

Abstract

Non-planar image-rotating OPO ring resonators necessitate polarisation compensation in contrast to their planar counterparts. This is essential for maintaining phase matching conditions for non-linear optical conversion in the resonator during each cavity round trip. In this study, we examine the polarisation compensation and its impact on the performance of two types of non-planar resonators: RISTRA with a π2 image rotation and FIRE with a fractional image rotation (π2 fraction). The RISTRA is insensitive to mirror phase shifts, while the FIRE has a more complex dependence of polarisation rotation on mirror phase shifts. There has been debate over whether a single birefringent element can provide adequate polarisation compensation for non-planar resonators beyond RISTRA-type. Our results show that under certain experimentally feasible conditions, even FIRE resonators can achieve adequate polarisation compensation with a single half-wave plate. We validate our theoretical analysis through numerical simulations and experimental studies of OPO output beam polarisation using ZnGeP2 non-linear crystals.

Funder

Direction Générale de l’Armement

Bundesamt für Ausrüstung, Informationstechnik und Nutzung der Bundeswehr

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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