Laser-Induced Thermionic Emission

Giori, F. A.; MacKenzie, L.A.; McKinney, E. J.

doi:10.1063/1.1753860

Cited by 31 publications

(3 citation statements)

References 2 publications

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“…Lichtman and Ready (1963), using carbon and tungsten as target materials, obtained current densities up to 100 A cm-2 from a spot size 350 pm in diameter and from their results deduced that the emission was purely thermal in origin. Giori et al (1963) observed current densities of 104 A cm-2 from tungsten and noted that the amplitude correlation between the light and electron pulses was not good. They suggested that only the slow component was thermionic in origin.…”

Section: Introductionmentioning

confidence: 99%

A New Type of the Spatial Filter for Detecting the Sharpness of Images

Ueda¹,

Nakayama²,

Sato

1975

Jpn. J. Appl. Phys.

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A description is given of experiments carried out using pulsed ruby and argon lasers to investigate the possibility of producing pulses of high electron emission current densities from tantalum, tungsten and lanthanum hexaboride cathodes heated by a focused laser beam. Current densities as high as lo4 A cm-2 were recorded using the ruby laser but subsequently it was shown, using the repetitively pulsed argon laser, that electron current densities of this order were obtained only when the cathode material was being melted. Lanthanum hexaboride was found to undergo changes on the surface when repetitively pulsed and was rejected in favour of the pure metals tungsten and tantalum. From these metals stable emission currents up to 1 mA peak were recorded from spots approximately 15 pm in diameter (i.e. 570 A cm-2) for several hours without incurring surface damage. Current density values of this order are near to those calculated from the Richardson equation for temperatures just below their melting points.Experimental results have confirmed theoretical predictions regarding the delayed onset of emission, the delay in the peak emission relative to the peak light intensity and the extremely rapid termination of the emission pulse.

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Section: Introductionmentioning

confidence: 99%

A New Type of the Spatial Filter for Detecting the Sharpness of Images

Ueda¹,

Nakayama²,

Sato

1975

Jpn. J. Appl. Phys.

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show abstract

“…They suggested that only the slow component was thermionic in origin. Giori et al (1963) observed current densities of 104 A cm-2 from tungsten and noted that the amplitude correlation between the light and electron pulses was not good.…”

Section: Introductionmentioning

confidence: 99%

Laser-induced electron emission from tungsten, tantalum and lanthanum hexaboride using ruby and argon lasers

Pittaway

Smith

Fletcher

et al. 1968

J. Phys. D: Appl. Phys.

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A description is given of experiments carried out using pulsed ruby and argon lasers to investigate the possibility of producing pulses of high electron emission current densities from tantalum, tungsten and lanthanum hexaboride cathodes heated by a focused laser beam. Current densities as high as 104 A cm−2 were recorded using the ruby laser but subsequently it was shown, using the repetitively pulsed argon laser, that electron current densities of this order were obtained only when the cathode material was being melted. Lanthanum hexaboride was found to undergo changes on the surface when repetitively pulsed and was rejected in favour of the pure metals tungsten and tantalum. From these metals stable emission currents up to 1 mA peak were recorded from spots approximately 15 μm in diameter (i.e. 570 A cm−2) for several hours without incurring surface damage. Current density values of this order are near to those calculated from the Richardson equation for temperatures just below their melting points. Experimental results have confirmed theoretical predictions regarding the delayed onset of emission, the delay in the peak emission relative to the peak light intensity and the extremely rapid termination of the emission pulse.

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“…This same slide also illustrates an event which is delayed twelve microseconds after the laser pulse. When the laser pulse is allowed to strike metal portions of the unit, various charged species and gases are removed from the surfaces(9)(10)(11)(12)(13)(14)(15)(16). If these particles moved near the electron beam, presumably electron deflections and scatterings cause the electron beam to move over the electron detector slit.…”

mentioning

confidence: 99%

Stimulated compton scattering of electrons by a laser beam

Roskos

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Laser-Induced Thermionic Emission

Cited by 31 publications

References 2 publications

A New Type of the Spatial Filter for Detecting the Sharpness of Images

A New Type of the Spatial Filter for Detecting the Sharpness of Images

Laser-induced electron emission from tungsten, tantalum and lanthanum hexaboride using ruby and argon lasers

Stimulated compton scattering of electrons by a laser beam

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