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Article
Pulse Laser Parameters Effect on Tissue Thermal Damage Zone in Coagulation Process

Authors: Khalid Salem Shibib --- Ayad Zwayen Mohammed --- Kholood Hasan Salih
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 5 Pages: 972-985
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Owed to wide use of pulsed lasers in a medical field, a deep understanding oftheir effects on the temperature increase in tissue and the subsequent tissue thermaldamage in a coagulation process may be a matter of importance. The influence oflaser beam profile, repetition rate and pulse width on temperature distribution and thesubsequent thermal damage in tissue are studied using finite element method, whichsolves the axis-symmetry bio-heat equation in tissue subjected to far IR pulse laserirradiation. Some conclusions are obtained: as energy/pulse remains constant,Gaussian laser beam profile rather than a top-hat beam will increase the in-depthtissue thermal damage at and near the center of the spot region, increasing inrepetition rate will increase the temperature distribution and subsequent damage zone.As pulse width decrease, high temperature may be reached leading to cause aquantitatively and qualitatively damage which can be recognize as an increase in thesize of the damage zone and a higher value of thermal dose. An increase in pulsewidth will reduce the rate at which energy deposed in the tissue which result in lowextent of temperature increase which result in reduction of the damage zonequantitatively and qualitatively.


Article
Effect of laser Parameters on Structural properties of PbS thin film prepared by pulse laser Deposition
تأثير معلمات الليزر على خواص التركيبية لاغشية كبريتيد الرصاص المحضرة بطريقة الترسيب بالليزر النبضي

Authors: Wajeha Abd Al Dayem وجيهه عبد الدائم --- Ghaleb Ali Al-Dahash* غالب عبدالوهاب علي الدهش --- Tabark Abd Al-Abass تبارك عبدالعباس
Journal: Albahir journal مجلة الباهر ISSN: 23125721 Year: 2015 Volume: 2 Issue: 3,4 Pages: 101-108
Publisher: AL-Abbas Holy Shrine العتبة العباسية المقدسة

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Abstract

Abstract In this research, we study the effect of changing of Laser parameters on properties of lead sulphide thin film (PbS) nanoparticles prepared by Pulsed laser deposition (PLD) on the base of glass.We used pulsed laser deposition for the preparation of (PbS) nanothinfilm limits 70-85 (nm) using a pulsed laser (Nd-YAG) with a wavelength of 1064 (nm). examination of the atomic force microscope (AFM) and examination of scanning electron microscope (SEM) for thin films prepared in this way. The results showed the possibility of preparation of thin films with grain size around 75 (nm). The scanning electron microscope images showed and the formation of a spherical shape nanoparticles using the method of Pulsed laser Deposition (PLD)

اﳋلاﺻة ﺍﻟﻨﺎﻧﻮﻳﺔ ﺍﳌﺤﴬﺓ (PbS)ﺗﻢ ﰲ ﻫﺬﺍ ﺍﻟﺒﺤﺚ ﺩﺭﺍﺳﺔ ﺗﺎﺛﲑ ﺗﻐﻴﲑ ﻣﻌﻠﲈﺕ ﺍﻟﻠﻴﺰﺭ ﻋﲆ ﺧﻮﺍﺹ ﺍﻏﺸﻴﺔ ﻛﱪﻳﺘﻴﺪ ﺍﻟﺮﺻﺎﺹ ﻋﲆ ﻗﻮﺍﻋﺪ ﻣﻦ ﺍﻟﺰﺟﺎﺝ. ﺍﺳﺘﺨﺪﻣﺖ ﻃﺮﻳﻘﺔ ﺍﻟﻘﺸﻂ ﺑﺎﻟﻠﻴﺰﺭ ﺍﻟﻨﺒﴤ ﻟﺘﺤﻀﲑ (PLD)ﺑﻄﺮﻳﻘﺔ ﺍﻟﱰﺳﻴﺐ ﺑﺎﻟﻘﺸﻂ ﺍﻟﻠﻴﺰﺭﻱ 1064 )ﻧﺎﻧﻮﻣﻴﱰ( ﺑﺎﺳﺘﺨﺪﺍﻡ ﻟﻴﺰﺭ )ﺍﻟﻨﺪﻳﻤﻴﻮﻡ-ﻳﺎﻙ( ﺍﻟﻨﺒﴤ ﺫﻱ ﺍﻟﻄﻮﻝ ﺍﳌﻮﺟﻲ 70-85 ﺍﻟﻨﺎﻧﻮﻳﺔ ﺑﺤﺪﻭﺩ (PbS)ﺍﻏﺸﻴﺔ ﻟﻼﻏﺸﻴﺔ ﺍﳌﺤﴬﺓ (SEM) ﻭﻓﺤﺺ ﺍﳌﺠﻬﺮ ﺍﻻﻟﻜﱰﻭﲏ ﺍﳌﺎﺳﺢ (AFM))ﻧﺎﻧﻮﻣﻴﱰ(. ﺗﻢ ﺃﺟﺮﺍﺀﻓﺤﺺ ﳎﻬﺮ ﺍﻟﻘﻮ￯ ﺍﻟﺬﺭﻳﺔ ﻧﺎﻧﻮﻣﻴﱰ(. ﺍﻥ ﺻﻮﺭ ﺍﳌﺠﻬﺮ 75 (0ﲠﺬﻩ ﺍﻟﻄﺮﻳﻘﺔ، ﻭﺑﻴﻨﺖ ﺍﻟﻨﺘﺎﺋﺞ ﺍﻣﻜﺎﻧﻴﺔ ﲢﻀﲑ ﺍﻏﺸﻴﺔ ﺭﻗﻴﻘﺔ ﻭﺑﻤﻌﺪﻝ ﺣﺠﻮﻡ ﺣﺒﻴﺒﻴﺔ (PLD)ﺍﻻﻟﻜﱰﻭﲏ ﺍﳌﺎﺳﺢ ﺃﻇﻬﺮﺕ ﺗﻜﻮﻧﻮﺗﺸﻜﻴﻞ ﺟﺴﻴﲈﺕ ﻧﺎﻧﻮﻳﺔ ﺫﺍﺕ ﺷﻜﻞ ﻛﺮﻭﻱ ﺑﺎﺳﺘﺨﺪﺍﻡ ﻃﺮﻳﻘﺔ ﺍﻟﻘﺸﻂ ﺑﺎﻟﻠﻴﺰﺭ

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