mJ range all-fiber MOPA prototype with hollow-core fiber beam delivery designed for large scale laser facilities seeding (Conference Presentation)

2017 ◽  
Author(s):  
Florent Scol ◽  
Pierre Gouriou ◽  
Arnaud Perrin ◽  
Jean-François Gleyze ◽  
Constance Valentin ◽  
...  
Keyword(s):  
Large Scale ◽  
Hollow Core ◽  
Core Fiber ◽  
Beam Delivery

Antiresonant hollow-core fiber fusion spliced to laser gain fiber for high-power beam delivery

2021 ◽  
Author(s):  
Charu Goel ◽  
Huizi Li ◽  
Muhammad Rosdi Abu Hassan ◽  
Wonkeun Chang ◽  
Seongwoo Yoo
Keyword(s):  
High Power ◽  
Hollow Core ◽  
Laser Gain ◽  
Core Fiber ◽  
Beam Delivery

scholarly journals Hollow Core Optical Fibers for Industrial Ultra Short Pulse Laser Beam Delivery Applications

Fibers ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 80 ◽  
Author(s):  
Sebastian Eilzer ◽  
Björn Wedel
Keyword(s):  
Laser Beam ◽  
Optical Fibers ◽  
Short Pulse ◽  
Flexible Beam ◽  
Hollow Core ◽  
Laser Interaction ◽  
Short Pulse Laser ◽  
Core Fiber ◽  
Beam Delivery ◽  
Ultra Short Pulse

Hollow core fibers were introduced many years ago but are now starting to be used regularly in more demanding applications. While first experiments mainly focused on the characterization and analysis of the fibers themselves, they are now implemented as a tool in the laser beam delivery. Owing to their different designs and implementations, different tasks can be achieved, such as flexible beam delivery, wide spectral broadening up to supercontinuum generation or intense gas-laser interaction over long distances. To achieve a constant result in these applications under varying conditions, many parameters of these fibers have to be controlled precisely during fabrication and implementation. A wide variety of hollow core fiber designs have been analyzed and implemented into a high-power industrial beam delivery and their performance has been measured.

scholarly journals Liquid level sensor based on dynamic Fabry–Perot interferometers in processed capillary fiber

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Pablo Roldán-Varona ◽  
Rosa Ana Pérez-Herrera ◽  
Luis Rodríguez-Cobo ◽  
Luis Reyes-González ◽  
Manuel López-Amo ◽  
...  
Keyword(s):  
Optical Fiber Sensor ◽  
Liquid Level ◽  
Hollow Core ◽  
Immiscible Liquids ◽  
Fabry Perot ◽  
Detection Mode ◽  
Level Sensor ◽  
Core Fiber ◽  
Liquid Level Sensor ◽  
Silica Capillary

AbstractIn this work, a novel optical fiber sensor capable of measuring both the liquid level and its refractive index is designed, manufactured and demonstrated through simulations and experimentally. For this, a silica capillary hollow-core fiber is used. The fiber, with a sensing length of 1.55 mm, has been processed with a femtosecond laser, so that it incorporates four holes in its structure. In this way, the liquid enters the air core, and it is possible to perform the sensing through the Fabry–Perot cavities that the liquid generates. The detection mode is in reflection. With a resolution of 4 μm (liquid level), it is in the state of the art of this type of sensor. The system is designed so that in the future it will be capable of measuring the level of immiscible liquids, that is, liquids that form stratified layers. It can be useful to determine the presence of impurities in tanks.

scholarly journals Geometrical Scaling of Antiresonant Hollow-Core Fibers for Mid-Infrared Beam Delivery

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 420
Author(s):  
Ang Deng ◽  
Wonkeun Chang
Keyword(s):  
Structural Parameters ◽  
Transmission Band ◽  
Confinement Loss ◽  
Hollow Core ◽  
Core Size ◽  
Core Diameter ◽  
Mid Infrared ◽  
The Core ◽  
Tubular Type ◽  
Beam Delivery

We numerically investigate the effect of scaling two key structural parameters in antiresonant hollow-core fibers—dielectric wall thickness of the cladding elements and core size—in view of low-loss mid-infrared beam delivery. We demonstrate that there exists an additional resonance-like loss peak in the long-wavelength limit of the first transmission band in antiresonant hollow-core fibers. We also find that the confinement loss in tubular-type hollow-core fibers depends strongly on the core size, where the degree of the dependence varies with the cladding tube size. The loss scales with the core diameter to the power of approximately −5.4 for commonly used tubular-type hollow-core fiber designs.

scholarly journals Vacuum Ultraviolet Absorption Spectroscopy Analysis of Breath Acetone Using a Hollow Optical Fiber Gas Cell

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 478
Author(s):  
Yudai Kudo ◽  
Saiko Kino ◽  
Yuji Matsuura
Keyword(s):  
Body Fat ◽  
Vacuum Ultraviolet ◽  
Exhaled Breath ◽  
Hollow Core ◽  
Gas Cell ◽  
Human Breath ◽  
Healthy Human ◽  
Acetone Concentration ◽  
Core Fiber ◽  
Breath Acetone

Human breath is a biomarker of body fat metabolism and can be used to diagnose various diseases, such as diabetes. As such, in this paper, a vacuum ultraviolet (VUV) spectroscopy system is proposed to measure the acetone in exhaled human breath. A strong absorption acetone peak at 195 nm is detected using a simple system consisting of a deuterium lamp source, a hollow-core fiber gas cell, and a fiber-coupled compact spectrometer corresponding to the VUV region. The hollow-core fiber functions both as a long-path and an extremely small-volume gas cell; it enables us to sensitively measure the trace components of exhaled breath. For breath analysis, we apply multiple regression analysis using the absorption spectra of oxygen, water, and acetone standard gas as explanatory variables to quantitate the concentration of acetone in breath. Based on human breath, we apply the standard addition method to obtain the measurement accuracy. The results suggest that the standard deviation is 0.074 ppm for healthy human breath with an acetone concentration of around 0.8 ppm and a precision of 0.026 ppm. We also monitor body fat burn based on breath acetone and confirm that breath acetone increases after exercise because it is a volatile byproduct of lipolysis.

scholarly journals Transmission of 61 C-band Channels over Record Distance of Hollow-Core-Fiber with L-band Interferers

2020 ◽  
pp. 1-1
Author(s):  
Antonino Nespola ◽  
Stefano Straullu ◽  
Thomas D. Bradley ◽  
Kerrianne Harrington ◽  
Hesham Sakr ◽  
...  
Keyword(s):  
Hollow Core ◽  
Core Fiber ◽  
L Band

scholarly journals Loading and spatially resolved characterization of a cold atomic ensemble inside a hollow-core fiber

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Thorsten Peters ◽  
Leonid P. Yatsenko ◽  
Thomas Halfmann
Keyword(s):  
Atomic Ensemble ◽  
Hollow Core ◽  
Spatially Resolved ◽  
Core Fiber
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