scholarly journals Experimental Investigations on Laser Ablation of Aluminum in Sub-Picosecond Regimes

2020 ◽  
Vol 10 (24) ◽  
pp. 8883
Author(s):  
Katarzyna Garasz ◽  
Marek Kocik
Keyword(s):  
Ultrafast Lasers ◽  
Femtosecond Lasers ◽  
Irradiation Time ◽  
Ultrashort Pulses ◽  
Aluminum Foil ◽  
Picosecond Laser ◽  
Experimental Investigations ◽  
Micro Electro Mechanical Systems ◽  
Thin Aluminum ◽  
Laser Interactions

Due to high power and ultrashort pulses, femtosecond lasers excel at (but are not limited to) processing materials whose thicknesses are less than 500 microns. Numerous experiments and theoretical analyses testify to the fact that there are solid grounds for the applications of ultrafast laser micromachining. However, with high costs and complexity of these devices, a sub-picosecond laser that might be an alternative when it comes to various micromachining applications, such as patterns and masks in thin metal foils, micro-nozzles, thermo-detectors, MEMS (micro electro-mechanical systems), sensors, etc. Furthermore, the investigation of sub-picosecond laser interactions with matter could provide more knowledge on the ablation mechanisms and experimental verification of existing models for ultrashort pulse regimes. In this article, we present the research on sub-picosecond laser interactions with thin aluminum foil under various laser pulse parameters. Research was conducted with two types of ultrafast lasers: a prototype sub-picosecond Yb:KYW laser (650 fs) and a commercially available femtosecond Ti:S laser (35 fs). The results show how the variables such as pulse width, energy, frequency, wavelength and irradiation time affect the micromachining process.

scholarly journals Experimental Study of the Behavior of Phase Change Materials during Interrupted Phase Change Processes

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8021
Author(s):  
Rohit Jogineedi ◽  
Kaushik Biswas ◽  
Som Shrestha
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Numerical Models ◽  
Aluminum Foil ◽  
Experimental Investigations ◽  
Change Processes ◽  
Research Article ◽  
Thin Aluminum ◽  
Phase Change Phenomena ◽  
Change Material

This research article explores the behavior of a phase change material (PCM) when it undergoes interrupted melting and freezing, through experimental investigations using a heat flow meter apparatus. A fatty acid-based organic PCM, encapsulated within polyethylene and thin aluminum foil layers, was experimentally tested in this study. Experiments were designed to represent multiple interrupted phase change scenarios that could occur within PCMs applied in buildings. The experimental results were analyzed and compared with previously reported assumptions in numerical models dealing with PCM hysteresis and interrupted phase change processes. These comparisons indicated that the assumptions used in the different numerical models considered can capture the interrupted phase change phenomena with varying degrees of accuracy. The findings also highlighted the need for additional experimental research on different phase change processes that can occur in building applications of PCMs.

Wireless power transfer system with ultra-thin aluminum foil

2021 ◽  
Author(s):  
Lei Yang ◽  
Xiaojie Li ◽  
Jianle Jian ◽  
Zhe Wang ◽  
Yuanqi Zhang ◽  
...  
Keyword(s):  
Wireless Power Transfer ◽  
Aluminum Foil ◽  
Transfer System ◽  
Power Transfer ◽  
Wireless Power ◽  
Thin Aluminum ◽  
Wireless Power Transfer System ◽  
Thin Aluminum Foil

Separation of a process from the neuronal cell body using a thin aluminum foil separator

1998 ◽  
Vol 2 (4) ◽  
pp. 352-356 ◽  
Author(s):  
Kosuke Noda ◽  
Keita Jimbo ◽  
Kazuo Suzuki ◽  
Kentaro Yoda
Keyword(s):  
Cell Body ◽  
Neuronal Cell ◽  
Aluminum Foil ◽  
Neuronal Cell Body ◽  
Thin Aluminum ◽  
Thin Aluminum Foil

Properties of the surface of structural materials in the area of a barcode formed under the action of laser radiation

2021 ◽  
Vol 1 ◽  
pp. 15-24
Author(s):  
Yu.R. Kolobov ◽  
◽  
A.E. Ligachev ◽  
Keyword(s):  
Laser Radiation ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Structural Materials ◽  
Metal Alloys ◽  
Experimental Investigations ◽  
Structure And Properties ◽  
Surface Layers ◽  
Continuous Laser ◽  
Near Surface

A review of experimental investigations of changes in the structure and properties of the surface and near-surface layers of various materials (steels, metal alloys, ceramics and graphite) in the area of a barcode applied by continuous laser radiation and short (nanosecond) and ultrashort (femto- and picosecond) laser pulses.

On-line measurements of proton beam current from a PET cyclotron using a thin aluminum foil

2013 ◽  
Vol 8 (07) ◽  
pp. P07010-P07010 ◽  
Author(s):  
S Ghithan ◽  
S J C do Carmo ◽  
R Ferreira Marques ◽  
F A F Fraga ◽  
H Simões ◽  
...  
Keyword(s):  
Proton Beam ◽  
Aluminum Foil ◽  
Beam Current ◽  
Thin Aluminum ◽  
On Line ◽  
Thin Aluminum Foil

DIFFRACTION OF 3.2 CM. ELECTROMAGNETIC WAVES BY DIELECTRIC RODS: III. LUCITE IN. DIAMETER SEMICYLINDER, FIELDS VERY CLOSE TO SURFACE

1957 ◽  
Vol 35 (11) ◽  
pp. 1253-1264 ◽  
Author(s):  
A. B. McLay ◽  
C. E. Jordan
Keyword(s):  
Electromagnetic Waves ◽  
Plane Surface ◽  
Near Field ◽  
Aluminum Foil ◽  
Evanescent Waves ◽  
Incident Field ◽  
Thin Aluminum ◽  
Diffraction Patterns ◽  
Thin Aluminum Foil

The diffraction fields near a long, semicylindrical, [Formula: see text] in. diameter rod of lucite, oriented in a nearly plane incident field of 3.2 cm. waves with plane surface towards or away from the source, have been reinvestigated in the region very close to the rod more thoroughly than previously (McLay and Subbarao 1956). The incident field was polarized parallel to the long axis of the semicylinder. In addition, the field near the rod when it was oriented with plane surface aligned with the axis of propagation and the field when the same rod was coated with thin aluminum foil and placed in turn in each of the three above-mentioned orientations have now been observed.A number of features in the diffraction patterns of the uncoated lucite rod have been qualitatively accounted for as resulting from effects of weak radiation after one or more internal reflections, or from evanescent waves close to a part of the surface where internal incidence is at angles greater than critical, superposed on one or more of the incident, directly transmitted and externally reflected radiations. The patterns a little away from the surface of the uncoated rod and the whole patterns of the aluminum-coated one are quite simple relatively and provide evidence of marked near-field diffraction.

scholarly journals Synchronized multi-wavelength soliton fiber laser via intracavity group delay modulation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Dong Mao ◽  
Huaqiang Wang ◽  
Heze Zhang ◽  
Chao Zeng ◽  
Yueqing Du ◽  
...  
Keyword(s):  
Ultrafast Lasers ◽  
Group Delay ◽  
Temporal Structure ◽  
Chromatic Dispersion ◽  
Complex Structure ◽  
Ultrashort Pulses ◽  
Saturable Absorption ◽  
Pulse Shaper ◽  
Longitudinal Modes ◽  
Multi Wavelength

AbstractLocking of longitudinal modes in laser cavities is the common path to generate ultrashort pulses. In traditional multi-wavelength mode-locked lasers, the group velocities rely on lasing wavelengths due to the chromatic dispersion, yielding multiple trains of independently evolved pulses. Here, we show that mode-locked solitons at different wavelengths can be synchronized inside the cavity by engineering the intracavity group delay with a programmable pulse shaper. Frequency-resolved measurements fully retrieve the fine temporal structure of pulses, validating the direct generation of synchronized ultrafast lasers from two to five wavelengths with sub-pulse repetition-rate up to ~1.26 THz. Simulation results well reproduce and interpret the key experimental phenomena, and indicate that the saturable absorption effect automatically synchronize multi-wavelength solitons in despite of the small residual group delay difference. These results demonstrate an effective approach to create synchronized complex-structure solitons, and offer an effective platform to study the evolution dynamics of nonlinear wavepackets.

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