دراسة نظرية لنبضة ليزر CO2 ذو التهيج المستعرض عند الضغط الجوي
Theoretical Study and Modeling of the CO2 Laser Pulse with Transverse Excitation at Atmospheric Pressure
- الباحث
- رقية حيدر رشاد
- المشرف
- أ.د. صاحب نعمة عبد الواحد
- الجامعة
- جامعة الكوفة
- الكلية / القسم
- التربية للبنات / الفيزياء
- الشهادة
- ماجستير
- السنة
- 2022
- لغة الرسالة
- عربي
- الكلمات المفتاحية
- ليزر CO2;التهيج المستعرض;الضغط الجوي;النمذجة النظرية
Abstract
CO2 laser is one of the types of gas lasers, which is the subject of this thesis, and it is a molcularr laser with a wavelength (10.6 μm) that works in the far infrared region. This thesis included a theoretical study of the shape and capacity of the outgoing TEA-CO2 laser pulse by solving the numerical time rate equations of the CO2 laser using a method called Rung-Kutta and using a computer program in Matlab2021 language. The study of the shape and power of the laser pulse depended on several variables, including the change of ratio of the gas mixture (CO2: N2: He) and the change of the reflectivity values in the laser output mirror, and the change of The values of the temperature of the active medium, the change in the length of the laser resonator, the wavelength change, and the change in the loss coefficient in the active medium. The results obtained from changing the mixture of gases showed in the ratios (1:3:3,1:2:4, 2:1:1, 1:1:2, 1:1:1), the best result obtained was in the ratio (2:1:1). The effect of changing the reflectivity values of the output mirror with values of (0.95,0.85,0.80,0.75,0.65), and the best result obtained was (0.85). The effect of changing the temperature of the active medium with values of (150,200,250,300,350)k the best result obtained was with a value of (150) k. the effect of changing the wavelength the best result obtained was with a value of (10.6), as for the effect of changing the loss coefficient in the resonator with values of (0.1,0.001,0.005 ,0.0001,0.05) the best result was obtained at (0.100) and the lowest value at (0.001). The results that we got from changing the length of the laser resonator showed with values of (50,100,150,200,250,) The best result was obtained at (250)cm.
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