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Iraqi Journal of Applied Physics

المجلة العراقية للفيزياء التطبيقية

ISSN: 18132065 23091673
Publisher: iraqi society for alternative and renewable energy sources and techniques
Faculty:
Language: English

This journal is Open Access

About

The Iraqi Journal of Applied Physics (IJAP) is a peer reviewed journal of high quality devoted to the publication of original research papers from applied physics and their broad range of applications. IJAP publishes quality original research papers, comprehensive review articles, survey articles, book reviews, dissertation abstracts in physics and its applications in the broadest sense. It is intended that the journal may act as an interdisciplinary forum for Physics and its applications. Innovative applications and material that brings together diverse areas of Physics are particularly welcome. Review articles in selected areas are published from time to time. It aims to disseminate knowledge; provide a learned reference in the field; and establish channels of communication between academic and research experts, policy makers and executives in industry, commerce and investment institutions. IJAP is a quarterly specialized periodical dedicated to publishing original papers, letters and reviews in: Applied & Nonlinear Optics, Applied Mechanics & Thermodynamics, Digital & Optical Communications, Electronic Materials & Devices, Laser Physics & Applications, Plasma Physics & Applications, Quantum Physics & Spectroscopy, Semiconductors & Optoelectronics, Solid State Physics & Applications, Alternative and Renewable Energy, Computers Networks and Applications.

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Contact info

P. O. Box 55259,
Baghdad 12001,
Iraq
Website: www.iraqiphysicsjournal.com
Email: admin@iraqiphysicsjournal.com
Email: editor_ijap@yahoo.co.uk

Table of content: 2020 volume:16 issue:2

Article
IRAQI JOURNAL OF APPLIED PHYSICS
المجلة العراقية للفيزياء التطبيقية

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Abstract

The Iraqi Journal of Applied Physics (IJAP) is a peer reviewed journal of high quality devoted to the publication of original research papers from applied physics and their broad range of applications. IJAP publishes quality original research papers, comprehensive review articles, survey articles, book reviews, dissertation abstracts in physics and its applications in the broadest sense. It is intended that the journal may act as an interdisciplinary forum for Physics and its applications. Innovative applications and material that brings together diverse areas of Physics are particularly welcome. Review articles in selected areas are published from time to time. It aims to disseminate knowledge; provide a learned reference in the field; and establish channels of communication between academic and research experts, policy makers and executives in industry, commerce and investment institutions. IJAP is a quarterly specialized periodical dedicated to publishing original papers, letters and reviews in: Applied & Nonlinear Optics, Applied Mechanics & Thermodynamics, Digital & Optical Communications, Electronic Materials & Devices, Laser Physics & Applications, Plasma Physics & Applications, Quantum Physics & Spectroscopy, Semiconductors & Optoelectronics, Solid State Physics & Applications, Alternative and Renewable Energy, and Computers and Networks.


Article
Instructions to Authors
تعليمات للمؤلفين

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Abstract

Contributions to be published in this journal should be original research works, i.e., those not already published or submitted for publication elsewhere, individual papers or letters to editor. Manuscripts should be submitted to the editor at the mailing address: Iraqi Journal of Applied Physics, Editorial Board, P. O. Box 55259, Baghdad 12001, IRAQ Website: www.iraqiphysicsjournal.com Email: editor@iraqiphysicsjournal.com, editor_ijap@yahoo.co.uk


Article
Gaussian to Super-Gaussian Laser Beam Intensity Profile Conversion using Glass Micro-Optic Fabricated with Reflowed Photoresist

Authors: J. D. Mensall
Pages: 3-10
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Abstract

In this study, we demonstrate a pair of optics for conversion of a Gaussian beam to a super-Gaussian and a super-Gaussian back to a Gaussian Furthermore, we show that beam quality is maintained by super-Gaussian thermal lensing.


Article
Simultaneous Amplitude-Modulation and Harmonic Frequency-Modulation Mode Locking of Nd:YAG Laser

Authors: R. P. Schott
Pages: 11-16
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Abstract

Into a fundamentally AM modelocked Nd:YAG laser, we incorporate an electro-optic phase modulator driven at the 22nd harmonic (1.76 GHz). With only 0.6 Watts of RF power we obtain 17 ps pulses at 80 MHz and 8.0 Watts average optical power.


Article
Crosstalk and Noise in Optical Amplifier with Gain Clamping by Vertical Laser Field

Authors: Janii Okasanen --- Juekka Tuikki
Pages: 17-24
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Abstract

We have calculated the transient behavior and noise of a semiconductor optical amplifier with its gain clamped by a vertical cavity laser (VCL). The calculations are based on a numerical stochastic rate equation model including several forward and backward propagating channels that are coupled to the vertical laser field through the active medium. The noise model takes into account randomly amplified spontaneous emission and random gain. Numerical simulations have been carried out to study the relaxation oscillations, cross talk and noise in a system with a strong input signal switched on and off while observing the output signals, VCL photon density and carrier density. Results show that the VCL field captures most of the disturbances, in agreement with available experimental data.


Article
Modeling of Plume Dynamics in Laser Ablation with Application to Nanotubes Synthesis

Authors: D. Ceasar Loebão --- Allex Porvitsky
Pages: 25-30
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Abstract

The aim of this study is to find optimal conditions for the formation of carbon nanotubes in a laser furnace. This paper describe our mathematical model and numerical algorithm, and discuss some of the fluid physics underlying this crucial technology. An axisymmetric unsteady computational gas dynamic model of plume expansion into ambiance has been developed. In the present work the vapor gas phase is modeled using the Relaxing TVD scheme in generalized coordinates. A numerical model of pulsed ablated gas is proposed based on the mass, momentum, and energy conservation laws. The proposed model implements a multi-species formulation for concentration of chemical components combined with the compressible Euler equations. To advance the solution in time, this set of equations is integrated numerically by second order Runge-Kutta scheme.


Article
Micron-Scale Modifications of Silicon Surface Morphology by Pulsed-Laser Texturing

Authors: T. Schwartz-Salinger
Pages: 31-36
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Abstract

The morphologies of Si surfaces are modified with single, tightly-focused nanosecond laser pulses and characterized by atomic force microscopy (AFM). Dimple-shaped features with diameters 1–4 μm and depths 1–300 nm are produced by varying the laser-spot diameter and the peak energy densities F0 in the range 0.4 < F0 < 1.3 J cm−2. Greater control of the depth of shallow dimples and quantitative comparison of theory and experiment is enabled by first removing the native oxide of Si with dilute HF acid. We develop approximate analytical solutions for two-dimensional fluid-flow driven by gradients in the surface tension; these solutions provide fundamental insight on how the morphology depends on laser parameters and the thermophysical properties of the melt and its surface. Quantitative comparisons between theory and experiment are enabled by using numerical simulations of heat flow in one-dimension as inputs to the analytical fluid-flow equations; we find good agreement with AFM data for the dimple shape and depth.


Article
Characterization of Highly-Pure Silicon Dioxide Nanoparticles as Scattering Centers for Random Gain Media

Authors: Hayder G. Fahad --- Oday A. Hammadi
Pages: 37-42
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Abstract

In this work, silicon dioxide thin films were prepared and deposited on glass substrates by dc reactive magnetron sputtering technique. The film material was extracted from the substrates as powder by conjunctional freezing-assisted ultrasonic extraction method. The structural characterization of the extracted powder confirmed the formation of nanostructures as the particle size was ranging in 19-34 nm. They also confirmed the high purity of these nanostructures as no other compound than silicon dioxide was observed in the final samples. The extracted nanopowder was employed as scattering centers in Rhodamine B dye solution and the spectral measurements showed that the relative enhancement in fluorescence of the dye solution containing silicon dioxide nanoparticles exceeds 25%, which highly encourages considering these results to prepare random gain media. These results can effectively be used to design and fabricate random gain media with low production cost, high spectral quality and good reliability for wavelength narrowing and tuning.

Table of content: volume:16 issue:2