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