Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userThe development of program in on advanced –programming language (MATLAB ), To solve the rate equations of laser and to study the properties of laser emission in the case of pulse –working of laser (Q.switch)
تطوير برنامج بلغة متقدمة ( ماتلاب ) لحل معادلات المعدّل لليزر ودراسة خواص الإصدار الليزري في حالة التشغيل النبضي (Q-switch) .
1079
0 15
0.0
(
0
)
Added by
Tishreen University ورقة بحثية
Publication date
2017
fields
Physics
and research's language is
العربية
Authors
نظير ديوب( باحث )
Created by
Shamra Editor
Ask ChatGPT about the research
يتضمن البحث تطوير برنامج , بلغة برمجية متقدمة ماتلاب (MATLAB) , لحل جملة معادلتين تفاضليتين جزئيتين مترابطتين غير خطيتين , تشكلان نموذج رياضي يصف الحالة الديناميكية لليزر , بحيث نستطيع من خلال هذا النموذج و البرنامج المتعلق دراسة خواص كثافة الإشعاع , و كذلك انعكاس السكانية داخل الوسط المتجانس لليزر . لقد درسنا شدة طاقة الخرج و كذلك انعكاس السكانية , في حالة التشغيل النبضي لليزر الحالة الصلبة Nd:YAG , و كيفية تغير انعكاس السكانية بتابعية أبعاد الوسط الفعال لليزر.
The work includes the development of a program in an advanced – programming language. to solve two none linear related partial differential equation that form a mathematical model that describes the dynamic status of laser ,so that we can study the properties of radiation density through this type the related program ,as well as the population inversion inside the homogeneous medium of laser . We have studied the strength f the out put power as well as the population inversion in the case of pulse – working of the solid state laser Nd:YAG and the population inversion change as a function of the diameter and length of the effective medium of laser .
References used
Walter Koechner, Micheal Bass, Solid State Laser ,springer-Verlag New York,Inc,2003,409
MARK CSELE,"Fundamentals of Light Sources and Lasers",copyright by John Wiley and Sone, Inc,2004,318
Ertan Eryilamz, Design and Construction of A cw Mode Nd: YAG laser Prototype ,august 2004,67
rate research
Read More
sapphire oscillator in order to generate a single wavelength at 780 nm.
The model offers a simple mechanism to investigate the impact of the
variations of the input parameters (maximum amplification coefficient,
pumping rate, loss coefficient, and
pumping density) on the output pulse
characteristics (delay time, pulse width, pulse build up time, duration and
peaks maxima of the Nd3+ -YAG pumping laser). Moreover, this model allows
studying the gain-switched Ti:sapphire output characteristics as being pumped
by the second harmonic wavelength (532nm).
Numerical results showed that the maxima of the output photon density,
pulse width, delay time, and pulse duration are very much dependent on the
power variations of the pumping source.
Aim:This study was conducted to compare the in vivo effectiveness of
DIAGNOdent pen with conventional methods (visual and radiographic
examination) for the detection of occlusal and approximal caries in primary
molars.
Thin films of ZnO were successfully prepared on glass substrates with different thicknesses by sol-gel method by using zinc acetate dehydrate as precursor. The surface of thin films morphology from were studied by AFM micrographs, the structural prop
erties of the obtained ZnO thin film are studied using X-ray diffraction spectra and their elemental analysis by X-ray energy dispersion spectroscopy (EDX). Moreover, optical properties and emission of ZnO nano thin film were evaluate during ultraviolet-visible-infrared and photoluminescence spectra. The AFM investigations have revealed that the morphology of the films is smooth and homogeneous specially for the high thickness and the grains produced on the surface take the form of nano rods with an average diameter of 240nm. Structural analysis by X-ray diffraction showed that the deposited films have a preferred orientation along the direction (112) and are relatively uniform with average crystal size 19nm, while the EDX spectrum showed that the elemental composition of these films is zinc oxide. The spectrophotometer Ultraviolet -Visible confirms that it is possible to get good transparent ZnO films with a transmission of 77 to 92% in the infrared. The values of optical gaps Eg vary between 3.273 - 3.256 eV. The peak of photoluminescence exhibited a visible emission peak at 616nm that refers to possibility of using thin films as an effective medium of random laser.
Theoretical calculations using density functional theory (DFT) both on semi
empirical and Ab initio levels have been carried out for pyrromethene laser
dye and related compounds (PM-chromophore, PM-4m, PM 546, PM650 PM
567 and PM597). We carried o
ut theoretical calculations using DFT, AM1, TDDFT
and CIS on ground and excited states for the selected laser dye materials,
we obtained the optimized geometry of the molecules, UV, IR spectrum, and
the transition between the ground S0 and the first excited S1 states exclusively,
the HOMO and LUMO states and other properties.
Laser use and applications in dentistry has increased dramatically in the last
years. Laser etching of enamel may provide an alternative for conventional acid etching. The aim of this
study was to evaluate, under Scanning Electron Microscope(SEM),
enamel surface morphology after
laser irradiation with or without the addition of photoabsorber (black ink); with or without acid etching.
laser enamel etching produced surface
roughness that might be used for the infiltration and subsequent mechanical retention of resin.
suggested questions
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
