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20 June 2024 Simultaneous femtosecond inscription of two wavelength-separated fiber Bragg gratings at the same spot
A. Halstuch, A. A. Ishaaya
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Proceedings Volume 13005, Laser + Photonics for Advanced Manufacturing; 130050S (2024) https://doi.org/10.1117/12.3017270
Event: SPIE Photonics Europe, 2024, Strasbourg, France
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Abstract
A simple method for the simultaneous inscription of two spectrally separated fiber Bragg gratings (FBGs) with a femtosecond laser at the same spatial spot is presented. The inscription setup consists of the following elements, i.e., an amplified near-IR femtosecond laser, two identical Phase-Masks (PM), two cylindrical focusing lenses, a negative defocusing spherical lens and a 50%:50% beam splitter. The inscription beam is divided into two equal beams each containing ~50% of the energy by means of a beam splitter. Each beam is then focused on the same spatial spot of the optical fiber through a 2140 nm period PM and a cylindrical lens. One beam is focused from one side, while the other beam is focused on the same spot, but from the opposite side. This ensures the simultaneous inscription of two FBGs at the same spatial spot. The wavelength separation is achieved by defocusing one of the beams with a negative spherical lens. The transmission and reflection spectrum of the two FBGs are measured. The center Bragg wavelength of the shorter FBG is ~1548.6 nm, and the center Bragg wavelength of the longer FBG is ~1553.9 nm or ~1550.4 nm when using a defocusing lens of −400 mm or −1000 mm, respectively, in the second inscription beam path. The measured transmission dip of all FBGs is greater than −4 dB.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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A. Halstuch and A. A. Ishaaya "Simultaneous femtosecond inscription of two wavelength-separated fiber Bragg gratings at the same spot", Proc. SPIE 13005, Laser + Photonics for Advanced Manufacturing, 130050S (20 June 2024); https://doi.org/10.1117/12.3017270
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KEYWORDS
Fiber Bragg gratings
Bragg wavelengths
Femtosecond phenomena
Femtosecond laser micromachining
Optical fibers
Parallel processing
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