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Title: Apparatus and process for active pulse intensity control of laser beam

Abstract

An optically controlled laser pulse energy control apparatus and process is disclosed wherein variations in the energy of a portion of the laser beam are used to vary the resistance of a photodetector such as a photoresistor through which a control voltage is fed to a light intensity controlling device through which a second portion of the laser beam passes. Light attenuation means are provided to vary the intensity of the laser light used to control the resistance of the photodetector. An optical delay path is provided through which the second portion of the beam travels before reaching the light intensity controlling device. The control voltage is supplied by a variable power supply. The apparatus may be tuned to properly attenuate the laser beam passing through the intensity controlling device by adjusting the power supply, the optical delay path, or the light attenuating means.

Inventors:
 [1]
  1. Oakland, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
868514
Patent Number(s):
5157676
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01S - DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; process; active; pulse; intensity; control; laser; beam; optically; controlled; energy; disclosed; variations; portion; vary; resistance; photodetector; photoresistor; voltage; fed; light; controlling; device; passes; attenuation; means; provided; optical; delay; path; travels; reaching; supplied; variable; power; supply; tuned; properly; attenuate; passing; adjusting; attenuating; control voltage; beam passes; beam passing; laser pulse; laser beam; laser light; power supply; light intensity; optical delay; control apparatus; pulse energy; active pulse; variable power; energy control; intensity control; beam travels; pulse intensity; optically controlled; delay path; controlled laser; light attenuation; /372/

Citation Formats

Wilcox, Russell B. Apparatus and process for active pulse intensity control of laser beam. United States: N. p., 1992. Web.
Wilcox, Russell B. Apparatus and process for active pulse intensity control of laser beam. United States.
Wilcox, Russell B. Wed . "Apparatus and process for active pulse intensity control of laser beam". United States. https://www.osti.gov/servlets/purl/868514.
@article{osti_868514,
title = {Apparatus and process for active pulse intensity control of laser beam},
author = {Wilcox, Russell B},
abstractNote = {An optically controlled laser pulse energy control apparatus and process is disclosed wherein variations in the energy of a portion of the laser beam are used to vary the resistance of a photodetector such as a photoresistor through which a control voltage is fed to a light intensity controlling device through which a second portion of the laser beam passes. Light attenuation means are provided to vary the intensity of the laser light used to control the resistance of the photodetector. An optical delay path is provided through which the second portion of the beam travels before reaching the light intensity controlling device. The control voltage is supplied by a variable power supply. The apparatus may be tuned to properly attenuate the laser beam passing through the intensity controlling device by adjusting the power supply, the optical delay path, or the light attenuating means.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

Patent:

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