Method for Generating High Purity Laguerre–Gaussian Vortex Modes
| العنوان: | Method for Generating High Purity Laguerre–Gaussian Vortex Modes |
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| المؤلفون: | Stephen J. Beecher, W. Andrew Clarkson, Callum R. Smith, Robin Uren |
| المصدر: | IEEE Journal of Quantum Electronics. 55:1-9 |
| بيانات النشر: | Institute of Electrical and Electronics Engineers (IEEE), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Physics, business.industry, Phase (waves), Mode (statistics), Physics::Optics, Condensed Matter Physics, Laser, Atomic and Molecular Physics, and Optics, law.invention, Vortex, Interferometry, Optics, law, Laser power scaling, Electrical and Electronic Engineering, business, Scaling, Beam (structure) |
| الوصف: | Generation of a donut-shaped first-order Laguerre–Gaussian (LG01) vortex mode via a method designed to yield high mode purity is reported. Our approach utilizes a novel twin-spot end-pumping scheme to directly excite the first order Hermite–Gaussian (HG01) mode in a solid-state laser, followed by a novel astigmatic mode converter based on spherical (concave) mirrors aligned at oblique incidence. A simple theoretical model for the mode converter is derived and from this the design approach is explained along with the potential benefits compared with conventional schemes-based cylindrical-lens astigmatic mode converters, particularly for power scaling. As a proof-of-principle and to confirm the benefits of this scheme in terms of high mode purity we have applied it to an end-pumped Nd:YVO4 laser to generate a (LG01) beam with a controllable sense of azimuthal phase and hence orbital angular momentum. A method for characterizing the resulting beam-based on analysis of the spiral interference pattern derived with the aid of a Mach–Zehnder interferometer is described and yields a value for the LG01 mode purity of 94%. Common sources of mode impurity are identified and the prospects for scaling to higher power whilst maintaining high mode purity are considered. |
| تدمد: | 1558-1713 0018-9197 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::bcc4e2d34a4e3c793ad02339b421c88c https://doi.org/10.1109/jqe.2019.2931006 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........bcc4e2d34a4e3c793ad02339b421c88c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15581713 00189197 |
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