In this paper. we demonstrate high-efficiency inscription of Bragg gratings in microfiber. Strong Bragg gratings are easily inscribed using a 193-nm excimer laser and phase mask in microfiber drawn from the 62. 5/125- μm standard multimode fiber (MMF) with no additional photosensitization treatment. https://parisnaturalfoodes.shop/product-category/org-argan-oil/