Sains Malaysiana 32: 87-92 (2003) Sains Fizis dan Gunaan /
Physical & Applied Science
Fabricaion of Fiber Bragg Grating
with an Apodised Phase Mask
Sulaiman Wadi Harun, Prabakaran Poopalan & Harith Ahmad
Physics Department , Faculty of Science
Universiti Malaya, 50603 Kuala Lumpur, Malaysia
ABSTRACT
A fiber Bragg grating (FBG) is fabricated with the aid of an apodised phase mask. The expanded Gaussian beam from a frequency doubled 244 nm CW argon ion laser is used as the UV printing source. A 66% reflectivity FBG was successfully fabricated by this method, however side lobes still appear in the short wavelength side of the spectrum. This condition is attributed to insufficient coverage by non-uniform ultraviolet light over the phase mask.
ABSTRAK
Parutan Bragg gentian (PBG) telah difabrikasi dengan menggunakan topeng fasa terapodisasi. Pancaran UV berbentuk Gaussan dan diperbesarkan dari laser ion argon yang mempunyai panjang gelombang 244 nm telah digunakan dalam ujikaji. PBG yang mempunyai peratus pantulan sebanyak 66% telah berjaya dihasilkan dengan kaedah ini. Walau bagaimanapun, cuping sisi masih lagi dikesan di bahagian jarak gelombang pendek. Kesan ini disebabkan oleh pancaran ultraungu yang tidak sekata dan tidak meliputi sepenuhnya topeng fasa.
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