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MEASUREMENT OF LASER BEAM PROFILE AFTER PROPAGATION THROUGH UNTWISTED AND TWISTED SILICA MICROSTRUCTURED OPTICAL FIBERS WITH A HOLLOW RING CORE DOPED WITH GeO₂. EJCSDI [Internet]. 2026 Apr. 15 [cited 2026 May 9];2(4):12-20. Available from: https://eurekaoa.com/index.php/10/article/view/790