@inproceedings{8de3fe77d935444fbcfbc7e6989736d5,
title = "Inscription of phase-shifted gratings with ultrashort pulses using defocusing and phase-mask shifting",
abstract = "Two slightly shifted wavelength gratings are inscribed one over the other in a single mode fiber by shifting the phase-mask between two positions. The inscription setup includes a NIR femtosecond laser, a phase-mask, a defocusing spherical lens and a cylindrical focusing lens. A first fiber Bragg grating (FBG) is inscribed, while the second overlapping FBG is inscribed only after a slight shift of the phase-mask, enabling a slight wavelength shift. The transmission spectrum of the complex structure is like that of a phase shifted grating, while the inscription process is very fast and simple compared to other standard methods. A high-quality phase shifted grating with two −20 dB transmission dips, a 15 dB transmission peak with a 30 pm transmission bandwidth at 3 dB is achieved. It is also observed that this phase shifted grating structure is birefringent.",
keywords = "Femtosecond inscription, Fiber Bragg gratings, Optical fibers, Phase shifted gratings",
author = "Aviran Halstuch and Ishaaya, {Amiel A.}",
note = "Publisher Copyright: {\textcopyright} 2021 SPIE.; Micro-structured and Specialty Optical Fibres VII 2021 ; Conference date: 19-04-2021 Through 23-04-2021",
year = "2021",
month = jan,
day = "1",
doi = "https://doi.org/10.1117/12.2591765",
language = "American English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Kyriacos Kalli and Alexis Mendez and Pavel Peterka",
booktitle = "Micro-structured and Specialty Optical Fibres VII",
address = "United States",
}