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Full-Text Articles in Physical Sciences and Mathematics
Measuring The Pulse Duration Of A Femtosecond Laser Using Intensity Autocorrelation, Ross N. Relic
Measuring The Pulse Duration Of A Femtosecond Laser Using Intensity Autocorrelation, Ross N. Relic
Macalester Journal of Physics and Astronomy
In this experiment, an intensity autocorrelator is set up in order to measure the pulse duration of a passively mode-locked Titanium-Sapphire laser with a power of 267mW producing femtosecond pulses. Then this measurement, as well as a measurement of the laser’s spectrum, is used to test the Uncertainty Principle. Intensity autocorrelation is a well-established technique for measuring pulse duration, and is among the more intuitive techniques for this purpose, which is why it was selected for this experiment. The experimental setup was computerized. The delay of one half of the pulse was controlled by a motorized translation stage which was …
Laboratory Plasma Tests Towards The Production Of Simulated Supernova Shock Waves, Elatia Zaffke, John Sinko, Matthew Thomas, Elisha Polomski
Laboratory Plasma Tests Towards The Production Of Simulated Supernova Shock Waves, Elatia Zaffke, John Sinko, Matthew Thomas, Elisha Polomski
SCSU Journal of Student Scholarship
Supernovae are some of the most powerful explosions that occur in our universe. These explosions generate massive shock waves that span tens of light years in distance. They are responsible for atomic fusion that creates the denser elements, needed for the creation of planets such as our own. The goal of this project was to simulate a supernova on a small scale, in order to study the resultant shock waves and their effects upon the interstellar medium. This research can improve understanding of the impact these events have upon the formation of solar systems and the composition of the interstellar …
Laser Production And Characterization Of Zinc-Oxide Nanoparticles, Bijaya Ghorasainee, Sanjeev Regmi, John Sinko
Laser Production And Characterization Of Zinc-Oxide Nanoparticles, Bijaya Ghorasainee, Sanjeev Regmi, John Sinko
SCSU Journal of Student Scholarship
ZnO nanoparticles exhibit attractive optical properties that are important in the realm of catalysis and nanotechnology involving the developments of solar cells, chemical sensors and other optoelectronic devices. The main objective of this project was to create zinc oxide nanoparticles of less than 10 nm size by using an Nd: YAG laser and characterize the particle diameter. Zinc oxide nanoparticles were prepared by vaporizing zinc in neat deionized water by laser ablation, aided by a physical 2D-motional micro-stage programmed by Arduino. The addition of surfactant was explored to reduce aggregation of the nanoparticles. Various purification methods were applied to this …
Change Of Parameters Of Arsenidgallium Diode Structures With A Barrierschottki After Laser Radiation, K Ismailov
Change Of Parameters Of Arsenidgallium Diode Structures With A Barrierschottki After Laser Radiation, K Ismailov
Karakalpak Scientific Journal
In this article, the effect of low intensities of laser radiation at a radiation density less than critical on the electrical characteristics of arsenide gallium diode structures with a Schottky barrier Cr-n-n+-GaAs is investigated. The possibility of controlling their parameters at relatively low laser radiation intensities is shown.
Change Of Parameters Of Arsenidgallium Diode Structures With A Barrierschottki After Laser Radiation, K Ismailov
Change Of Parameters Of Arsenidgallium Diode Structures With A Barrierschottki After Laser Radiation, K Ismailov
Karakalpak Scientific Journal
In this article, the effect of low intensities of laser radiation at a radiation density less than critical on the electrical characteristics of arsenide gallium diode structures with a Schottky barrier Cr-n-n+-GaAs is investigated. The possibility of controlling their parameters at relatively low laser radiation intensities is shown.
Spectra Of One – And Two Photon Excited Luminescence Of Medical Drugsin Photon Traps, A.K. Kubanov, D.I. Semenov
Spectra Of One – And Two Photon Excited Luminescence Of Medical Drugsin Photon Traps, A.K. Kubanov, D.I. Semenov
Scientific Journal of Samarkand University
A technique for studying the photoluminescence spectra of pharmaceuticals (analgin, paracetamol) was developed for single- and two-photon excitation by a pulse-periodic laser. The technique is based on the fiber-optic recording of photoluminescence spectra using a small-size spectrometer, quartz light guides, and mini cavity cuvettes, which makes it possible to compare the analyzed spectrum with the spectrum of the reference substance.
Bessel And Bessel Vortex Beams Generated By Blunt-Tip Axicon, Ramazan Şahi̇n
Bessel And Bessel Vortex Beams Generated By Blunt-Tip Axicon, Ramazan Şahi̇n
Turkish Journal of Physics
A theoretical prediction of the propagation characteristics of Laguerre--Gaussian beams after passing through a blunt-tip axicon is presented. An ideal axicon generates theoretically perfect diffraction-free and smooth-on-axis intensity Bessel beams, while experiments and calculations show that a zeroth-order Bessel beam deviates from its perfect behavior. Strong intensity modulation occurs due to interference around the center of the beam. The origin of these oscillations should be explored to increase the quality of beam shaping. This research shows that these oscillations can be reduced by stopping the beam center for a small portion or by optimizing input beam parameters. On the other …
Mathematical Model: Comparative Study Of Thermal Effects Of Laser In Corneal Refractive Surgeries, Gokul Kc, Dil B. Gurung, Pushpa R. Adhikary
Mathematical Model: Comparative Study Of Thermal Effects Of Laser In Corneal Refractive Surgeries, Gokul Kc, Dil B. Gurung, Pushpa R. Adhikary
Applications and Applied Mathematics: An International Journal (AAM)
Lasers have been widely used in ophthalmology. Refractive errors are some of the most common ophthalmic abnormalities worldwide. Laser refractive surgery was developed to correct refractive errors myopia, hyperopia and astigmatism. Two types of laser surgical techniques: lamellar and thermal are available to reshape the corneal curvature. Ultraviolet (UV) emitting argon fluoride (ArF) excimer laser is used to sculpt cornea in lamellar procedures, whereas, infrared (IR) emitting holmium yttrium aluminum garnet (Ho: YAG) laser is used to shrink cornea in thermal procedure. Tissue heating is common in all types of laser surgical techniques. Hence, in this paper, a finite element …
Optimization Of Laser Marking With The Help Of Simulation Models, Lyubomir Kostadimov Lazov, Nikolay Angelov Petrov
Optimization Of Laser Marking With The Help Of Simulation Models, Lyubomir Kostadimov Lazov, Nikolay Angelov Petrov
Turkish Journal of Physics
This article covers the results of several numerical experiments carried out with specific software working under MATLAB for marking of tool steel and electronic elements. CuBr and Nd:YAG lasers were used in this study. Simulations with 3 different durations of pulse of laser radiation were achieved. Numerical calculations were performed with values (for laser sources and technological parameters) based on real experiments.
Numerical Experiments For Determining Laser-Induced Temperature Fields, Lyubomir Kostadinov Lazov, Nikolay Angelov Petrov
Numerical Experiments For Determining Laser-Induced Temperature Fields, Lyubomir Kostadinov Lazov, Nikolay Angelov Petrov
Turkish Journal of Physics
Based on the equation of energy balance and the equation of heat conductivity with the help of specialized software, tentative engineering calculations were performed for the process of laser marking by melting and structural changes. The functional capabilities of the software product were examined. Distribution of temperature by layers for samples of tool steel was obtained.