scholarly journals Electronic Pulses from Pulsed Field Emission of CNT Cathodes

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Xianqi Wei ◽  
Xiaoli Wang ◽  
Xin Li ◽  
Weihua Liu
Keyword(s):  
Thermal Effect ◽  
Field Emission ◽  
High Frequency ◽  
Laser Pulses ◽  
Infrared Laser ◽  
Pulsed Field ◽  
Electron Sources ◽  
Waveform Distortion ◽  
Electronic Pulse ◽  
Emission Cathode

We presented a demonstration of infrared laser irradiated field emission electronic pulse based on carbon nanotube (CNT) cathodes. Electronic pulses greatly depended on pulsed infrared laser and were almost synchronous with laser pulses. We have designed a pulsed field emission cathode based on CNTs and investigated correlation between electronic pulse and laser pulse, acquiring the shortest width of electronic pulses about 50 ms and turn-on field less than 0.14 V/μm. Besides, we have studied the thermal effect on the pulsed field emission of CNT cathodes caused by laser heating. Interestingly, the thermal effect has caused an enhancement of emission current but resulted in a waveform distortion on short electronic pulses. The application of laser pulses on CNT cathodes would extend conventional electron sources to a pulsed electron source and offered a possibility of pulsed field emission. These results were encouraging us to prepare further studies of ultrafast electronic pulses for high-frequency electron sources.

Anomalous high-frequency oscillations in a field emission tube and their significance in pulsed field emission

2007 ◽  
Vol 107 (9) ◽  
pp. 854-856
Author(s):  
M.J. Hagmann ◽  
D.A. Christensen ◽  
M.S. Mousa ◽  
A. Baturin ◽  
E.P. Sheshin
Keyword(s):  
Field Emission ◽  
High Frequency ◽  
Pulsed Field ◽  
High Frequency Oscillations

Pulsed Field Emission Cathode Emittance Measurements

1969 ◽  
Vol 40 (11) ◽  
pp. 1413-1414 ◽  
Author(s):  
J. R. Uglum ◽  
S. E. Graybill ◽  
S. V. Nablo
Keyword(s):  
Field Emission ◽  
Field Emission Cathode ◽  
Pulsed Field ◽  
Emission Cathode

A Stable Field Emission Electron Source

1977 ◽  
Vol 35 ◽  
pp. 58-59
Author(s):  
W.R. Bottoms ◽  
G.B. Haydon
Keyword(s):  
Field Emission ◽  
Signal To Noise Ratio ◽  
High Brightness ◽  
Electron Sources ◽  
Brightness Field ◽  
Current Densities ◽  
Properties Of Materials ◽  
Stable Field ◽  
Stable Current ◽  
Careful Design

There is great interest in improving the brightness of electron sources and therefore the ability of electron optical instrumentation to probe the properties of materials. Extensive work by Dr. Crew and others has provided extremely high brightness sources for certain kinds of analytical problems but which pose serious difficulties in other problems. These sources cannot survive in conventional system vacuums. If one wishes to gather information from the other signal channels activated by electron beam bombardment it is necessary to provide sufficient current to allow an acceptable signal-to-noise ratio. It is possible through careful design to provide a high brightness field emission source which has the capability of providing high currents as well as high current densities to a specimen. In this paper we describe an electrode to provide long-lived stable current in field emission sources.The source geometry was based upon the results of extensive computer modeling. The design attempted to maximize the total current available at a specimen.

scholarly journals Carbon Nanotube Electron Sources: From Electron Beams to Energy Conversion and Optophononics

2014 ◽  
Vol 2014 ◽  
pp. 1-23 ◽  
Author(s):  
Alireza Nojeh
Keyword(s):  
Carbon Nanotubes ◽  
Field Emission ◽  
Electron Emission ◽  
Electron Beams ◽  
Thermionic Emission ◽  
Secondary Emission ◽  
Electron Sources ◽  
Field Emitters ◽  
Electron Microscopes ◽  
Electron Emitters

Carbon nanotubes have a host of properties that make them excellent candidates for electron emitters. A significant amount of research has been conducted on nanotube-based field-emitters over the past two decades, and they have been investigated for devices ranging from flat-panel displays to vacuum tubes and electron microscopes. Other electron emission mechanisms from carbon nanotubes, such as photoemission, secondary emission, and thermionic emission, have also been studied, although to a lesser degree than field-emission. This paper presents an overview of the topic, with emphasis on these less-explored mechanisms, although field-emission is also discussed. We will see that not only is electron emission from nanotubes promising for electron-source applications, but also its study could reveal unusual phenomena and open the door to new devices that are not directly related to electron beams.

scholarly journals Pulse compression of submillijoule few-optical-cycle infrared laser pulses using chirped mirrors

2009 ◽  
Vol 34 (12) ◽  
pp. 1894 ◽  
Author(s):  
Mathieu Giguère ◽  
Bruno E. Schmidt ◽  
Andrew D. Shiner ◽  
Marie-Andrée Houle ◽  
Heidi C. Bandulet ◽  
...  
Keyword(s):  
Pulse Compression ◽  
Laser Pulses ◽  
Infrared Laser ◽  
Optical Cycle

scholarly journals Two-photon vibrational excitation of air by long-wave infrared laser pulses

2016 ◽  
Vol 94 (2) ◽  
Author(s):  
J. P. Palastro ◽  
J. Peñano ◽  
L. A. Johnson ◽  
B. Hafizi ◽  
J. K. Wahlstrand ◽  
...  
Keyword(s):  
Vibrational Excitation ◽  
Laser Pulses ◽  
Infrared Laser ◽  
Two Photon ◽  
Long Wave ◽  
Long Wave Infrared

scholarly journals Nonperturbative generation of above-threshold harmonics from pre-excited argon atoms in intense mid-infrared laser fields

2017 ◽  
Vol 5 ◽  
Author(s):  
Guihua Li ◽  
Hongqiang Xie ◽  
Ziting Li ◽  
Jinping Yao ◽  
Wei Chu ◽  
...  
Keyword(s):  
Excited State ◽  
Femtosecond Laser ◽  
Pulse Energy ◽  
Laser Pulses ◽  
Infrared Laser ◽  
Femtosecond Laser Pulses ◽  
Probe Laser ◽  
Laser Fields ◽  
Mid Infrared ◽  
Highly Nonlinear

We experimentally investigate the generation of above-threshold harmonics completely from argon atoms on an excited state using mid-infrared femtosecond laser pulses. The highly nonlinear dependences of the observed signal on the pulse energy and polarization of the probe laser pulses indicate its nonperturbative characteristic.

Sign in / Sign up

Export Citation Format

Share Document