Zhaokun Lu, Ziqian Liu, Jiale Tang, Feifan Wang, Chunyu Zhao, Fuqiang Jia, Bo Zhang, Sivagunalan Sivanathan, Kang Li
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Generation of high-order Hermite-Gaussian modes and optical vortices by manipulating off-axis displacement of an intracavity lens.
Hermite-Gaussian (HG) modes and optical vortices (OVs) are crucial for advanced photonic applications. In this work, we demonstrate a more intuitive and precisely controllable intracavity approach compared with existing methods such as off-axis pumping, mirror tilting, and crystal tilting. By adjusting the off-axis displacement of a plano-convex lens, the astigmatism introduced into the cavity is precisely tuned. This allows the generation of continuous-wave HG0,n modes with tunable n from 0 to 24 in a compact laser-diode (LD) end-pumped Nd:YAG laser. Using an astigmatic mode converter (AMC), vortex beams with topological charge tunable from 1 to 24 are obtained and verified by interference patterns. This approach provides a direct and compact route to diverse structured beams for advanced optical systems.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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