TY - GEN
T1 - Inscription of phase-shifted gratings with ultrashort pulses using defocusing and phase-mask shifting
AU - Halstuch, Aviran
AU - Ishaaya, Amiel A.
N1 - Funding Information: Financial support is acknowledged by the Israel Ministry of Science, Technology, and Space (3-14289). Publisher Copyright: © 2021 SPIE.
PY - 2021/1/1
Y1 - 2021/1/1
N2 - 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.
AB - 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.
KW - Femtosecond inscription
KW - Fiber Bragg gratings
KW - Optical fibers
KW - Phase shifted gratings
UR - http://www.scopus.com/inward/record.url?scp=85109215730&partnerID=8YFLogxK
U2 - https://doi.org/10.1117/12.2591765
DO - https://doi.org/10.1117/12.2591765
M3 - Conference contribution
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Micro-structured and Specialty Optical Fibres VII
A2 - Kalli, Kyriacos
A2 - Mendez, Alexis
A2 - Peterka, Pavel
PB - SPIE
T2 - Micro-structured and Specialty Optical Fibres VII 2021
Y2 - 19 April 2021 through 23 April 2021
ER -