Low energy sub-micron laser machining using photonic nanojet with shaped optical fiber tip (Conference Presentation)

2018 ◽  
Author(s):  
Sylvain Lecler ◽  
Robin Pierron ◽  
Grégoire Chabrol ◽  
Frédéric Mermet ◽  
Joël Fontaine
Keyword(s):  
Optical Fiber ◽  
Low Energy ◽  
Laser Machining ◽  
Photonic Nanojet

scholarly journals Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers

2006 ◽  
Vol 60 (7-8) ◽  
pp. 176-179
Author(s):  
Aleksandar Kojovic ◽  
Irena Zivkovic ◽  
Ljiljana Brajovic ◽  
Dragan Mitrakovic ◽  
Radoslav Aleksic
Keyword(s):  
Composite Materials ◽  
Optical Fiber ◽  
Real Time ◽  
Optical Fibers ◽  
Impact Damage ◽  
Experimental Testing ◽  
Low Energy ◽  
Thermoplastic Composite ◽  
Woven Fabric ◽  
The Impact

This paper investigates the possibility of applying optical fibers as sensors for investigating low energy impact damage in laminar thermoplastic composite materials, in real time. Impact toughness testing by a Charpy impact pendulum with different loads was conducted in order to determine the method for comparative measurement of the resulting damage in the material. For that purpose intensity-based optical fibers were built in to specimens of composite materials with Kevlar 129 (the DuPont registered trade-mark for poly(p-phenylene terephthalamide)) woven fabric as reinforcement and thermoplastic PVB (poly(vinyl butyral)) as the matrix. In some specimens part of the layers of Kevlar was replaced with metal mesh (50% or 33% of the layers). Experimental testing was conducted in order to observe and analyze the response of the material under multiple low-energy impacts. Light from the light-emitting diode (LED) was launched to the embedded optical fiber and was propagated to the phototransistor-based photo detector. During each impact, the signal level, which is proportional to the light intensity in the optical fiber, drops and then slowly recovers. The obtained signals were analyzed to determine the appropriate method for real time damage monitoring. The major part of the damage occurs during impact. The damage reflects as a local, temporary release of strain in the optical fiber and an increase of the signal level. The obtained results show that intensity-based optical fibers could be used for measuring the damage in laminar thermoplastic composite materials. The acquired optical fiber signals depend on the type of material, but the same set of rules (relatively different, depending on the type of material) could be specified. Using real time measurement of the signal during impact and appropriate analysis enables quantitative evaluation of the impact damage in the material. Existing methods in most cases use just the intensity of the signal before and after the impact, as the measure of damage. This method could be used to monitor the damage in real time, giving warnings before fatal damage occurs.

Application of an Excimer Laser Machining Technique in the Construction of an Optical Fiber Bus

1992 ◽  
Vol 4 (2) ◽  
pp. 9-14 ◽  
Author(s):  
Richard J. Coyle ◽  
A. J. Serafino ◽  
Gary J. Grimes ◽  
James R. Bortolini
Keyword(s):  
Optical Fiber ◽  
Excimer Laser ◽  
Laser Machining

Cladding shaping of optical fiber preforms via CO2 laser machining (Conference Presentation)

2020 ◽  
Author(s):  
Peter C. Shardlow ◽  
Robert Standish ◽  
Martin N. Velazquez ◽  
Jayanta Sahu ◽  
Andy Clarkson
Keyword(s):  
Optical Fiber ◽  
Co2 Laser ◽  
Laser Machining ◽  
Fiber Preforms

scholarly journals Optical fiber-driven low-energy electron gun for time-resolved streak diffraction

2019 ◽  
Vol 205 ◽  
pp. 08016
Author(s):  
Chiwon Lee ◽  
H. Kassier Gunther ◽  
R. J. Dwayne Miller
Keyword(s):  
Electron Diffraction ◽  
Optical Fiber ◽  
Low Energy ◽  
Energy Electron ◽  
Electron Gun ◽  
Single Shot ◽  
Optical Fibres ◽  
Time Resolved ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron

The wave guiding feature of the optical fibre optical fibres is specifically exploited to construct a novel type of electron gun to realize single-shot low-energy electron diffraction experiments with the sub-picosecond resolution for studying irreversible samples.

Excimer laser machining of optical fiber taps

1991 ◽  
Author(s):  
Richard J. Coyle ◽  
Anthony J. Serafino ◽  
Gary J. Grimes ◽  
James R. Bortolini
Keyword(s):  
Optical Fiber ◽  
Excimer Laser ◽  
Laser Machining

scholarly journals Optical fiber-driven low energy electron gun for ultrafast streak diffraction

2018 ◽  
Vol 113 (13) ◽  
pp. 133502 ◽  
Author(s):  
Chiwon Lee ◽  
Günther Kassier ◽  
R. J. Dwayne Miller
Keyword(s):  
Optical Fiber ◽  
Low Energy ◽  
Energy Electron ◽  
Electron Gun ◽  
Low Energy Electron

Large-mode-area optical fiber for photonic nanojet generation

2019 ◽  
Vol 44 (10) ◽  
pp. 2474
Author(s):  
Robin Pierron ◽  
Grégoire Chabrol ◽  
Stéphane Roques ◽  
Pierre Pfeiffer ◽  
Jean-Paul Yehouessi ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Large Mode Area ◽  
Photonic Nanojet ◽  
Mode Area

In-Liquid Laser Nanomachining by Photonic Nanojet in Laser Trapping System

2020 ◽  
Author(s):  
Reza Aulia Rahman ◽  
Tsutomu Uenohara ◽  
Yasuhiro Mizutani ◽  
Yasuhiro Takaya
Keyword(s):  
Near Field ◽  
Machining Process ◽  
Laser Machining ◽  
Laser Trapping ◽  
Photonic Nanojet ◽  
Light Waves ◽  
Direct Laser ◽  
Liquid Laser ◽  
Micrometer Scale ◽  
Difference Time

Abstract Direct laser machining in sub-micron scale patterning at a surface of material remains a challenging task though the laser machining has been widely applied in various application. A photonic nanojet becomes a promising way to solve the problem by involving near-field focusing of light waves below the surface of a dielectric microsphere to fabricate pattern in micro- and nanometer size. By generating laser power to the microsphere and controlling the resulting photonic nanojet intensity distribution and position related to the workpiece, intended ablation size on the material could be controlled at the sub-micrometer scale. In this study, liquid is proposed as photonic nanojet machining medium due to several advantages that liquid offer during machining process. Laser trapping system is then introduced to the optical system to control the position of the microsphere during machining process. An in-liquid nanomachining by generating photonic nanojet in laser trapping configuration is a subject to study with the effect on the resulting ablation and viability of machining process from a set of parameters are investigated numerically using finite-difference time-domain (FDTD) technique. According to the findings of this study, nanometer scale, flexible, and fast novel laser nanomachining could be realized by combining photonic nanojet machining and laser trapping technique.

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