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in creator/contributor: "O'Malley, Martin W."  
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Photoconductive Semiconductor Switch Technology for Short Pulse Electromagnetics and Lasers

Description: High gain photoconductive semiconductor switches (PCSS) are being used to produce high power electromagnetic pulses foc (1) compact, repetitive accelerators, (2) ultra-wide band impulse sources, (3) precision gas switch triggers, (4) optically-activated firesets, and (5) high power optical pulse generation and control. High power, sub-nanosecond optical pulses are used for active optical sensors such as compact optical radars and range-gated hallistic imaging systems. Following a brief introduc… more
Date: August 5, 1999
Creator: Denison, Gary J.; Helgeson, Wesley D.; Hjalmarson, Harold P.; Loubriel, Guillermo M.; Mar, Alan; O'Malley, Martin W. et al.
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Partner: UNT Libraries Government Documents Department
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Longevity Improvement of Optically Activated, High Gain GaAs Photoconductive Semiconductor Switches

Description: The longevity of high gain GaAs photoconductive semiconductor switches (PCSS) has been extended to over 100 million pulses at 23A, and over 100 pulses at 1kA. This is achieved by improving the ohmic contacts by doping the semi-insulating GaAs underneath the metal, and by achieving a more uniform distribution of contact wear across the entire switch by distributing the trigger light to form multiple filaments. This paper will compare various approaches to doping the contacts, including ion impla… more
Date: March 2, 2000
Creator: Mar,Alan; Loubriel,Guillermo M.; Zutavern,Fred J.; O'Malley,Martin W.; Helgeson,Wesley D.; Brown,Darwin James et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Semiconductor e-h plasma lasers

Description: A new type of GaAs laser is based on the electron-hole plasma in a current filament and is not limited in size by p-n junctions. High energy, electrically controlled, compact, short-pulse lasers are useful for: active optical sensors (LADAR, range imaging, imaging through clouds, dust, smoke, or turbid water), direct optical ignition of fuels and explosives, optical recording, and micro-machining. The authors present a new class of semiconductor laser that can potentially produce much more shor… more
Date: June 6, 2000
Creator: Zutavern, Fred J.; Baca, Albert G.; Chow, Weng W.; Hafich, Michael J.; Hjalmarson, Harold P.; Loubriel, Guillermo M. et al.
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Partner: UNT Libraries Government Documents Department
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Temporal switching jitter in photoconductive switches

Description: This paper reports on a recent comparison made between the Air Force Research Laboratory (AFRL) gallium arsenide, optically-triggered switch test configuration and the Sandia National Laboratories (SNL) gallium arsenide, optically-triggered switch test configuration. The purpose of these measurements was to compare the temporal switch jitter times. It is found that the optical trigger laser characteristics are dominant in determining the PCSS jitter.
Date: April 13, 2000
Creator: Gaudet, John A.; Skipper, Michael C.; Abdalla, Michael D.; Ahern, Sean M.; Mar, Alan; Loubriel, Guillermo M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Doped Contacts for High-Longevity Optically Activated, High Gain GaAs Photoconductive Semiconductor Switches

Description: The longevity of high gain GaAs photoconductive semiconductor switches (PCSS) has been extended to over 100 million pulses. This was achieved by improving the ohmic contacts through the incorporation of a doped layer that is very effective in the suppression of filament formation, alleviating current crowding. Damage-free operation is now possible with virtually infinite expected lifetime at much higher current levels than before. The inherent damage-free current capacity of the bulk GaAs itsel… more
Date: December 17, 1999
Creator: Mar,Alan; Loubriel,Guillermo M.; Zutavern,Fred J.; O'Malley,Martin W.; Helgeson,Wesley D.; Brown,Darwin James et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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