مشاركة
دراسة تجريبية للحيود الحراري في صبغات مختلفة == Experimental Study of Thermal Self - Defocusing in Different Dyes
اسم المؤلف:
عمار محمد طعيمة
اسم المشرف:
مازن مانوئيل الياس
الموضوع العام:
علوم الليزر
السنة:
2013
الموضوع الدقيق:
تطبيقات الليزر في الفيزياء
الدرجة:
دكتوراه
الجامعة:
جامعة بغداد - معهد الليزر للدراسات العليا
اللغة:
الانكليزية
مكان الجامعة:
بغداد
الصفحات الاولى:
29T192 - p.pdf
المستخلص:
This thesis discusses the effect of three factors on self defocusing technique used to measure the nonlinear optical properties of two solutions, the first one is safranin O dissolved in ethanol (SOE), and the second one is diphenylecarbazone dissolved in chloroform (DCC). These factors are the intensity of laser, the concentration of the solution and the effect of the temperature on the solutions.After providing the necessary solution and equipment to complete the designed experiment, an appropriate model of nonlinear system was chosen to extract the diffraction rings contains the following parts : (Diode Laser, Attenuator, Mirrors, Beam Splitter, Lens, CCD Camera, Laser Power Meter and PC) In this work the maximum change and the thermo - optical coefficient for the nonlinear refractive index as well as the nonlinear refractive index were measured, for the two different solutions (SOE & DCC) including three ratios and grains for each one. The measurements were performed using diode laser at and variable intensity (0.5 - 22) and the laser beam was focused on glass cuvette which has a thickness of through a lens with a focal length of .From this work it was found that increasing the laser intensity leads to increase the number of diffraction rings, the nonlinear refractive index and the maximum change of the nonlinear refractive index, also it was found that increasing the concentration of the solutions leads to increase the nonlinear refractive index as well as increasing the maximum change of the refractive index.Also it was found that increasing the temperature of the solution at certain intensity and concentration the obtained results for the thermooptical coefficient , and the nonlinear refractive index are found to be of the order of and at 298, 303 and 308K respectively for SOE solution, and and at 298, 303 and 308K respectively for DCC solution, in which all the thermooptical coefficient and the nonlinear refractive index are deceased.
