اثر گازهای پیرامونی بر تابش پلاسما و گسترش آن در برهم کنش لیزر با مس

پیشدست, مسعود; اسلامی مجد, عبداله; کاوش تهرانی, مسعود

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ گروه الکترونیک، مجتمع دانشگاهی برق و الکترونیک، دانشگاه صنعتی مالک اشتر،

² گروه الکترونیک، مجتمع دانشگاهی برق و الکترونیک، دانشگاه صنعتی مالک اشتر

³ پژوهشگاه علوم و فن آوری اپتیک و لیزر، دانشگاه صنعتی مالک اشتر، شاهین شهر

چکیده

در این پژوهش اثر گازهای پیرامونی هوا، آرگون، هلیم و نئون در فشارهای مختلف بر تابش و گسترش پلاسمای حاصل از برهمکنش باریکه‌ی لیزر با هدف فلزی، با تأکید بر بهینه‌سازی نسبت سیگنال به تابش پیوستار به روش بیناب‌نمایی فروشکست القایی لیزری و جذب و پراکندگی پرتو کاوش بررسی شده است. نتایج نشان می‌دهند که تابش‌ها و گسترش پلاسما به نحو قابل‌توجهی به نوع و فشار گاز پیرامون وابسته است. بیشترین شدت خطوط نشری اتم مس به ترتیب برای گازهای آرگون، نئون، هوا و هلیم به دست آمده است. برای تمام گازها با افزایش فشار گاز پیرامون از 5 تا mbar100، شدت تابش طیفی پلاسما افزایش می‌یابد و سپس با بیشتر شدن فشار تا یک اتمسفر اشباع می‌شود. تابش پیوستار پلاسما نیز با افزایش فشار، روندی افزایشی دارد و به ترتیب برای گازهای آرگون، هوا، نئون و هلیم بیشترین مقدار را دارد. نسبت تابش طیفی به پیوستار زمینه به ترتیب برای گازهای هلیم، نئون، هوا و آرگون بیشینه است و برای تمام گازها با افزایش فشار کاهش می‌یابد. نتایج حاصل از گسترش پلاسما به روش جذب و پراکندگی پرتو کاوش با نظریه سدف- تیلور مقایسه شد. سرعت گسترش پلاسما در نزدیکی سطح هدف در حضور گاز هلیم در فشار mbar750 برابر با m/s25200 و در حضور گازهای نئون، هوا و آرگون به ترتیب 15625، 13900 و m/s 11860 به دست آمد که با دور شدن از سطح به شدت اُفت کرده و در فاصله 6mm از سطح برای گازهای هلیم، نئون، هوا و آرگون به ترتیب به 2550، 1000، 700 و m/s690 می‌رسد.

کلیدواژه‌ها

20.1001.1.17351871.1395.37.2.8.1

عنوان مقاله [English]

Impact of Ambient Gases on the Plasma Radiation and its Expansion in Laser-Copper Interaction

نویسندگان [English]

M Pishdast ¹
A Eslami Majd ²
M Kavosh Tehrani ³

چکیده [English]

In this paper, the impacts of air, argon, helium and neon ambient gases under different gas pressures on radiations, emphasizing in the signal to radiation background and the expansion of laser induced plasma from laser metal interaction have been experimentally studied using spectroscopy, probe beam absorption, and scattering methods. The results show that the plasma radiations and its expansion behavior depend strongly on the ambient gas presure. The highest intensity of the copper spectral lines occurred in argon, neon, air, and helium, respectively. For all gases, by increasing the gas pressure from 5 to 100 mbar the plasma spectral radiation increases and then it saturates at the higher gas pressure. The continuum radiation also increases with the pressure and has the highest value for Ar, air, Ne and He gases, respectively. Plasma in He, Ne, air and Ar has the best singnal to backgrourd (S/B) ratio, respectively, and decreases with the pressure. The probe beam absorption and scattering results have also been compared with the Sedov-Taylor strong shock wave model. The maximum speed of the plasma plume expansion, occurred near the target surface under 750 mbar gas pressure, and was determined for helium to be about 25200 m/s, and through neon, air and argon gases, amounted to about 15625, 13900 and 11860 m/s, respectively, as they reduced significantly when they were far from the target surface and reached 2550, 1000, 700 and 690 m/s at 6 mm from the target for helium, neon, air and argon, respectively.

کلیدواژه‌ها [English]

: Laser produced plasma
Ambient gas
Probe beam absorption and scattering
LIBS

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مجله علوم و فنون هسته ای

اثر گازهای پیرامونی بر تابش پلاسما و گسترش آن در برهم کنش لیزر با مس

مراجع

مراجع

[11] M. Akram, Shazia Bashir, Asma Hayat, Khaliq Mahmood, Riaz Ahmad, M. Khaleeq-U-Rahaman, Effect of laser irradiance on the surface morphology and laser induced plasma parameters of zinc, Laser Part. Beams 32 (2014) 119–128.

دوره 37، شماره 2 - شماره پیاپی 76
شهریور 1395
صفحه 68-78

اثر گازهای پیرامونی بر تابش پلاسما و گسترش آن در برهم کنش لیزر با مس

مراجع

مراجع

[11] M. Akram, Shazia Bashir, Asma Hayat, Khaliq Mahmood, Riaz Ahmad, M. Khaleeq-U-Rahaman, Effect of laser irradiance on the surface morphology and laser induced plasma parameters of zinc, Laser Part. Beams 32 (2014) 119–128.

دوره 37، شماره 2 - شماره پیاپی 76شهریور 1395صفحه 68-78

دوره 37، شماره 2 - شماره پیاپی 76
شهریور 1395
صفحه 68-78