Optics: measuring and testing – Photometers – Photoelectric
Patent
1981-06-18
1984-05-08
McGraw, Vincent P.
Optics: measuring and testing
Photometers
Photoelectric
136254, 250212, 313524, G01J 142, H01J 4000
Patent
active
044471513
ABSTRACT:
The method and device of the instant invention is a detector of pulsed laser radiation which utilizes the electromotive force generated by the plasma formed when such radiation is focused onto a surface (1). Measurements are made with a 10.6 .mu.m CO.sub.2 laser capable of producing peak intensities of 10.sup.13 W/cm.sup.2 when directed through a converging lens (2). Evacuated detector response to such laser intensity is 1 kV signal peak amplitude and subnanosecond risetimes into a 50.OMEGA. load (3). Detector performance is found to be greatly altered with the introduction of a background gas (4). For example, with one atmosphere of air, the detector produces prompt signals of the order of 1 V with subnanosecond response for pulse trains lasting 100 ns. With argon, krypton, or zenon at pressures of the order of 10 torr, the detector generates "trigger pulses" of about 250 V amplitude and 0.2 ns risetimes. Such detectors are quite robust when irradiated with high intensity laser radiation and are useful for qualitative laser beam monitoring.
REFERENCES:
patent: 4264375 (1981-04-01), Silfvast et al.
"Direct Conversion of CO.sub.2 Laser Energy to High Voltage Electrical Eny Using Laser Produced Plasma", Silfvast et al., Applied Physics Letters, vol. 31, No. 11, Dec. 1, 1977, pp. 726-728.
McLellan Edward J.
Webb John A.
Esposito Michael F.
Freund Samuel M.
Gaetjens Paul D.
McGraw Vincent P.
The United States of America as represented by the Department of
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