Luminescent Characteristics Study of a Mather-Type Dense Plasma Focus and Application to Laser Optical Pumping
Fanning, James Jay
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https://hdl.handle.net/2142/69337
Description
Title
Luminescent Characteristics Study of a Mather-Type Dense Plasma Focus and Application to Laser Optical Pumping
Author(s)
Fanning, James Jay
Issue Date
1985
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Abstract
A detailed investigation of the luminescent characteristics of a Mather-type dense plasma focus (MDPF) is performed. In addition, for the first time, the MDPF is utilized as an optical pump source for lasers. The main MDPF radiation output is a continuum emission created by intense high-energy electron bombardment of the beam-target material in the top of the center electrode. For a high atomic weight beam-target material, peak emission occurs from 5 to 10 eV. The long-wavelength tail of the continuum extends into the visible region up to 600 nm. Electrical-to-optical conversion efficiency in the 115-to-600 nm wavelength region is measured to be greater than 50%. Improvements in the MDPF's electrode design increase its versatility by showing successful low voltage operation at 5 kV. The first practical use of the MDPF's radiation was to photolytically pump organic dye lasers. In a proof-of-principle experiment rhodamine 6G dye is employed to generate a 250 mJ/cm('3) laser energy density. Due to its intense vacuum ultraviolet (VUV) emission, the MDPF is an ideal candidate for optically pumping very-short-wavelength lasers. The hard and soft X-ray emissions as well as the VUV output of the MDPF also make it a viable high-intensity source for high-throughput microlithography processes.
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