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Experimental investigation of 193 nm...
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The University of Wisconsin - Madison.
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Experimental investigation of 193 nm excimer laser induced plasma in air.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Experimental investigation of 193 nm excimer laser induced plasma in air./
作者:
Thiyagarajan, Magesh.
面頁冊數:
111 p.
附註:
Adviser: John E. Scharer.
Contained By:
Dissertation Abstracts International69-05B.
標題:
Engineering, Electronics and Electrical. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3314176
ISBN:
9780549632597
Experimental investigation of 193 nm excimer laser induced plasma in air.
Thiyagarajan, Magesh.
Experimental investigation of 193 nm excimer laser induced plasma in air.
- 111 p.
Adviser: John E. Scharer.
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2008.
Index Terms---Laser Induced Plasma, Excimer Laser, Shadowgraphy, Laser Interferometry, Spectroscopy, Air Plasma.
ISBN: 9780549632597Subjects--Topical Terms:
626636
Engineering, Electronics and Electrical.
Experimental investigation of 193 nm excimer laser induced plasma in air.
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Experimental investigation of 193 nm excimer laser induced plasma in air.
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Adviser: John E. Scharer.
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Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 3194.
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Thesis (Ph.D.)--The University of Wisconsin - Madison, 2008.
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Index Terms---Laser Induced Plasma, Excimer Laser, Shadowgraphy, Laser Interferometry, Spectroscopy, Air Plasma.
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This thesis presents the measurements and analysis of laser-induced breakdown processes in air at a wavelength of 193 nm by focusing 200 mJ, 10 MW high power 193 nm UV ArF laser radiation to a 30 mum spot size. Pressures ranging from 40 Torr to 5 atm are examined, for laser power densities up to 1 TW/cm 2, well above the threshold power flux for air ionization.
520
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The breakdown threshold electric field is measured and compared with classical and quantum theoretical ionization models at this short wavelength. A universal scaling analysis of these results allows one to predict some aspects of high power microwave breakdown based on measured laser breakdown observations. Comparison of 193 nm laser induced effective field intensities for air breakdown data calculated based on the collisional cascade and multi-photon breakdown theories are used successfully to determine the collisional microwave scaled portion with good agreement regarding both pressure dependence and breakdown threshold electric fields.
520
$a
Using a laser shadowgraphy diagnostic technique the plasma and shock wave dynamics are analyzed. Blast shock wave expansion of the plasma and laser heated neutral gas is observed with average velocities of 47 km/sec. Two-color laser interferometry is employed to measure time resolved spatial electron and neutral densities in LTE (Local Thermodynamic Equilibrium) and non-LTE conditions. The radiating species and the thermodynamic characteristics of the plasma are analyzed through optical emission spectroscopy (OES) supported by SPECAIR, a special OES program for air constituent plasmas. Rotational and vibrational temperatures are obtained from the emission spectra from the N2 C -- B (2+) transitions by matching the experimental spectrum results with the SPECAIR simulation results. The plasma density decay measurements are compared with a simplified electron density decay model that illustrates the dominant three- and two-body recombination terms as the plasma decays with good correlation.
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School code: 0262.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3314176
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