scholarly journals Femtosecond laser direct-written fiber Bragg gratings with high reflectivity and low loss at wavelengths beyond 4 µm

2020 ◽  
Vol 45 (15) ◽  
pp. 4316 ◽  
Author(s):  
Gayathri Bharathan ◽  
Toney Teddy Fernandez ◽  
Martin Ams ◽  
Jean-Yves Carrée ◽  
Samuel Poulain ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Low Loss ◽  
High Reflectivity

scholarly journals Optimized laser-written ZBLAN fiber Bragg gratings with high reflectivity and low loss

2019 ◽  
Vol 44 (2) ◽  
pp. 423 ◽  
Author(s):  
Gayathri Bharathan ◽  
Toney Teddy Fernandez ◽  
Martin Ams ◽  
Robert I. Woodward ◽  
Darren D. Hudson ◽  
...  
Keyword(s):  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Low Loss ◽  
High Reflectivity

scholarly journals Femtosecond Laser Fabricated Apodized Fiber Bragg Gratings Based on Energy Regulation

Photonics ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 110
Author(s):  
Qi Guo ◽  
Zhongming Zheng ◽  
Bo Wang ◽  
Xuepeng Pan ◽  
Shanren Liu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Suppression Ratio ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Side Lobe ◽  
Energy Regulation ◽  
Fiber Gratings ◽  
Core Diameter ◽  
High Reflectivity ◽  
Side Lobe Suppression

In this paper, an energy regulation method based on the combination of a half-wave plate (HWP) and a polarization beam splitter (PBS) is proposed for the fabrication of apodized fiber gratings, which can effectively improve the side lobe suppression ratio of high-reflectivity fiber Bragg gratings (FBGs) fabricated by femtosecond laser. The apodized FBGs prepared by this method has good repeatability and flexibility. By inputting different types of apodization functions through the program, the rotation speed of the stepping motor can be adjusted synchronously, and then the position of the HWP can be accurately controlled so that the laser energy can be distributed as an apodization function along the axial direction of the fiber. By using the energy apodization method, the gratings with a reflectivity of 75% and a side lobe suppression ratio of 25 and 32 dB are fabricated in the fiber with a core diameter of 9 and 4.4 μm, respectively. The temperature and strain sensitivities of the energy-apodized fiber gratings with a core diameter of 4.4 μm are 10.36 pm/°C and 0.9 pm/με, respectively. The high-reflectivity gratings fabricated by this energy apodization method are expected to be used in high-power narrow-linewidth lasers and wavelength division multiplexing (WDM) systems.

Wavelength tunable fiber Bragg gratings fabricated by stress annealing assisted femtosecond laser direct writing

2021 ◽  
Vol 61 ◽  
pp. 102427
Author(s):  
Xiaoyan Sun ◽  
Zikun Chang ◽  
Li Zeng ◽  
Xinran Dong ◽  
Youwang Hu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Wavelength Tunable

scholarly journals Ultrafast femtosecond-laser-induced fiber Bragg gratings in air-hole microstructured fibers for high-temperature pressure sensing

2010 ◽  
Vol 35 (9) ◽  
pp. 1443 ◽  
Author(s):  
Charles M. Jewart ◽  
Qingqing Wang ◽  
John Canning ◽  
Dan Grobnic ◽  
Stephen J. Mihailov ◽  
...  
Keyword(s):  
High Temperature ◽  
Femtosecond Laser ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Pressure Sensing ◽  
Microstructured Fibers ◽  
Air Hole

Quantitative morphology of femtosecond laser-written point-by-point optical fiber Bragg gratings

2021 ◽  
Author(s):  
Saurabh Bhardwaj ◽  
Toney Fernandez ◽  
Simon Gross ◽  
Michael Withford ◽  
Michael Steel
Keyword(s):  
Femtosecond Laser ◽  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Quantitative Morphology

Femtosecond laser post-processing mechanisms for refractive index tuning of fiber Bragg gratings

2021 ◽  
Author(s):  
Timothy O. Imogore ◽  
Thorsten A. Goebel ◽  
Ria G. Krämer ◽  
Christian Matzdorf ◽  
Daniel Richter ◽  
...  
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Post Processing ◽  
Processing Mechanisms
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