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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: 2005 volume:1 issue:1

Article
HAZ Extent Analysis in Fiber-Reinforced Plastic Grooving by Laser

Authors: O.A. Hamadi
Pages: 1-7
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Abstract

In this investigation, the anisotropic extent of HAZ in laser grooving of fiber-reinforced plastic was studied by constructing an analytical model then comparing results obtained with the experimental. A principle of three main components of anisotropic thermal conductivity was considered, and then the equation governing thermal conduction process was transformed to a form similar to that of isotropic material. An analysis, based on a three-dimensional anisotropic thermal conductivity and a moving heat source, was presented to predict HAZ extent in laser grooving of fiber-reinforced plastic. This analysis included prediction of HAZ extent when grooving is parallel to the principal axes and when it is off-axes. The HAZ extent was determined depending on temperature difference relative to matrix combustion or char temperature. With respect to survey of previous works, this investigation is a novel attempt to analyze the extent of HAZ in FRP grooving by a CW CO2 laser.


Article
A Line Tuned TMoo Mode CW CO2 Laser

Authors: F. H. Al-Berkdar --- D.N. Raouf --- F.H. Hamza
Pages: 8-10
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Abstract

A design, construction and operation of a stable frequency linetuned, plane-polarized CW CO2 laser are described. The maximum output power of 30W for 10P(20) V-R transitions was obtained. The line tuning of laser wavelength was achieved by using 100line/mm grating. This laser was stabilized by holding the laser cavity fixed using a low thermal expansion quartz rod.

Keywords

CO2 laser --- CW Lasers --- Line Tuning


Article
Optical Response Chracterization of In2O3/c-Si Made by Spray Pyrolysis

Authors: O.A.A. Sultan --- R.A. Ismail
Pages: 11-14
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Abstract

In2O3 thin films have been deposited on silicon substrate by chemical spray pyrolysis. These films show high transparency in the visible and near-IR regions. Photoresponse of In2O3/c-Si isotype hetero-photodiode without post-deposition heat treatment has been investigated in the visible and infrared regions. Peak response situated at 600nm was observed. External quantum efficiency was 32% at peak response. C-V measurements revealed that the junction was abrupt type and built-in potential around 1eV has been obtained.


Article
Laser-Controlled Photoluminescence Characteristics of Silicon Nanocrystallites Produced by Laser-Induced Etching

Authors: B.G. Rasheed
Pages: 15-19
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Abstract

In2O3 thin films have been deposited on silicon substrate by chemical spray pyrolysis. These films show high transparency in the visible and near-IR regions. Photoresponse of In2O3/c-Si isotype heterophotodiode without post-deposition heat treatment has been investigated in the visible and infrared regions. Peak response situated at 600nm was observed. External quantum efficiency was 32% at peak response. C-V measurements revealed that the junction was abrupt type and built-in potential around 1eV has been obtained.


Article
Effect of Oxygen Quencher on Absorption and Fluorescence Spectra of Rhodamie-6G and Rhodamine-B Dyes in Ethanol Solvent

Authors: H.M. Mikhlif --- M.T. Hussein --- S.J. Lafta
Pages: 20-24
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Abstract

In this work, absorption and fluorescence spectra of R6G and RB laser dyes were studied. Different concentrations of (1-4)x10-6 mole/liter were used to solve these dyes in an organic solvent such as ethanol. Absorption spectrum of n→S* transition was determined as well as fluorescence spectrum in presence and absence of O2. It was observed that presence of O2 did not affect absorption spectra of both dyes because it has no absorption in the range studied. On the other side, intensity of fluorescence increased as O2 was removed from solvent in both cases of ethanol. Presence of O2 affects fluorescence quantum efficiency and lifetime due to collision with dye molecules. Finally, it was declared that the effect of O2 decreases as the concentration does. This may be attributed to the decrease in collision probability between O2 and dye molecules.


Article
Design, Construction and Operation of a Multi-Stage Large-Bore CO2 Laser

Authors: D.N. Raouf --- N.A. Al-Rubaiey --- S.I. Abdul-Latif
Pages: 25-29
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Abstract

In this work, a CO2 laser system of five discharge stages was designed, constructed and operated with longitudinal electrical discharge and axial gas flow. The system was characterized throughout measuring output laser power as function of output coupler reflectivity, length of discharge tube and cooling water temperature. The maximum output power delivered was 135W at the TEM10 mode.


Article
Effect of Active Medium Temperature on the Output Characteristics of Pulsed Free-Running R6G and RB Dye Laser

Authors: M.A. Ahmed
Pages: 30-33
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Abstract

In this work, the effect of active medium temperature on output characteristics of a pulsed dye laser was studied. Two dyes, R6G and RB, were used as laser active medium. Under free-running operation, 35mJ maximum output energy and 100Ps pulse duration were obtained with presence of oxygen as a quencher. Results presented in this work showed that output characteristics such as laser pulse energy, emission linewidth, beam divergence and overall efficiency are reasonably affected by temperature. Optimum values of such features requires system to operate at temperature of 10°C which represents the optimum operating temperature. These results may benefit to determine the optimum operating temperature of a pulsed dye laser due to system design considerations.


Article
Structural Characteristics Study of Indium Diffusion in Silicon Using a Pulsed Nd:YAG Laser

Authors: W.K. Hamoudi --- R.O. Dala Ali
Pages: 34-38
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Abstract

In the current study, a pulsed Nd:YAG laser was employed to induce indium diffusion in silicon by laser irradiation of a thin indium film deposited on silicon. The work was aimed to study the structural characteristics changes of the irradiated region resulting from varying laser pulse energy within the range (0.25-0.53)J and varying silicon temperature from 300K to 373K during laser irradiation. Optical and scanning electron microscopes were used for the surface topography study of the samples. The study showed formation of linear cracks, protrusions and craters depending on the laser energy used. The indium diffusion depth within the silicon was determined using an energy dispersive spectra (EDS). This was done when illuminating at the laser melting threshold at substrate temperature of 373K and when illuminating at higher laser energy and substrate at room temperature (300K). the diffusion depth increased and the impurity concentration at the surface decreased as laser energy got higher. Higher substrate temperature helped increasing the impurity concentration at the surface.

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