Mr. Richard Loose Profile

Richard Loose

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Proceedings Article | 21 July 2000 Paper

High-energy laser plasma diagnostic system

Mingjun Zhao, Tin Aye, Norbert Fruehauf, Gajendra Savant, Daniel Erwin, Brayton Smoot, Richard Loose

Proceedings Volume 4034, (2000) https://doi.org/10.1117/12.391860

KEYWORDS: Plasma, Plasma diagnostics, Interferometers, Laser energy, Laser systems engineering, Plasma systems, Spectroscopy, Receivers, Plasma generation, Diagnostics

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This paper describes the development of a non-contact diagnosis system for analyzing the plasma density profile, temperature profile, and ionic species of a high energy laser-generated plasma. The system was developed by Physical Optics Corporation in cooperation with the U.S. Army Space and Missile Defense Command, High Energy Laser Systems Test Facility at White Sands Missile Range, New Mexico. The non- contact diagnostic system consists of three subsystems: an optical fiber-based interferometer, a plasma spectrometer, and a genetic algorithm-based fringe-image processor. In the interferometer subsystem, the transmitter and the receiver are each packaged as a compact module. A narrow notch filter rejects strong plasma light, passing only the laser probing beam, which carries the plasma density information. The plasma spectrum signal is collected by an optical fiber head, which is connected to a compact spectrometer. Real- time genetic algorithm-based data processing/display permits instantaneous analysis of the plasma characteristics. The research effort included design and fabrication of a vacuum chamber, and high-energy laser plasma generation. Compactness, real-time operation, and ease of use make the laser plasma diagnosis system well suited for dual use applications such as diagnosis of electric arc and other industrial plasmas.

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