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Article
A Line Tuned TMoo Mode CW CO2 Laser

Authors: F. H. Al-Berkdar --- D.N. Raouf --- F.H. Hamza
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 1 Pages: 8-10
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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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
Effect of chopped co2 laser on enamel surface

Author: Muthenna Sh. Raiab, B.D.S, M.S.c د.مثنى شعبان رجب
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2005 Volume: 2 Issue: 1 Pages: 15-20
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

This study aimed to assess the caries-preventive potential of various choppedCO2 laser parameters, and to explore the effect of the laser energy density on thecaries inhibition activity on enamel surface in vitro .Extracted human premolar teeth were irradiated with three various energydensities (25.47, 50.93, and 101.86) J/cm2, by changing the number of pulses, thepulse duration, and the spot diameter. The CO2 laser system emitted laser with6.01 um in wavelength and l0Hz repetition rate. All teeth were subjected to carieslikelesion tbrmation by 3.5 pH lactic acid for 2l days. The teeth after that were sectionedinto ground cross sections and the lesion depths were measured under a polarizingmicroscope .The result indicated that the chopped CO2 laser preventive treatments inhibitedcarieslike lesion progression up to 36%. This effect was improved with increased totalenergy density within the limits of the examined laser parameters


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

Author: O.A. Hamadi
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 1 Pages: 1-7
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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

Authors: D.N. Raouf --- N.A. Al-Rubaiey --- S.I. Abdul-Latif
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 1 Pages: 25-29
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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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.

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