Femtosecond laser point-by-point Bragg grating inscription in BDK-doped step-index PMMA optical fibers

Xuehao Hu, Zhen Chen, Xin Cheng, Rui Min, Hang Qu, Christophe Caucheteur, Hwayaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review


In this paper, the inscription of 2-mm-long fiber Bragg gratings (FBGs) on benzyl dimethyl ketal (BDK)-doped poly(methyl methacrylate) (PMMA) optical fibers by means of a femtosecond laser and a point-by-point FBG inscription technique is reported. The highest reflectivity of approximately 99% is obtained with a pulse energy of 68.5 nJ, showing a large refractive index modulation amplitude of 7.2 × 10−4. Afterwards, grating stabilities at room and higher temperatures of up to 80°C are investigated.
Original languageEnglish
Pages (from-to)249-252
JournalOptics Letters
Issue number2
Publication statusPublished - 5 Jan 2022

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