Item Details

Cold Cathodes for Sealed-Off CO₂ Lasers

by Urs E. Hochuli, Thomas P. Sciacca, and Charles R. Hurt
Format
Book; Government Document; Online; EBook
Published
Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973.
Language
English
Series
NASA Technical Note
Summary
Experimental results of a group of theoretically selected cold cathode materials are presented. These tests indicate Ag-CuO, Cu, and Pt-Cu as three new cold cathode materials for sealed-off CO2 lasers. The power output of a test laser with an Ag-CuO cathode and a gas volume of only 50 cu cm varied from 0.72 W to 1.1 W at 3000 hours and still yields 0.88 W after 8000 hours. Gas discharge tubes with Cu cathodes and a volume of 25 cu cm yield lifetimes in excess of 10,000 hours. Gas analysis results, obtained from a similar tube over a period of 3000 hours, look most promising. A Pt-Cu alloy cathode shows an extremely promising V-I characteristic over a period of 2800 hours.
Description
iv, 60 p. : ill. ; 27 cm.
Mode of access: Internet.
Notes
  • Prepared at Goddard Space Flight Center.
  • Cover title.
  • Bibliography: p. 11.
Series Statement
NASA technical note ; NASA TN D-7307
Logo for Copyright Not EvaluatedCopyright Not Evaluated
Technical Details

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    a| Cold cathodes for sealed-off CO₂ lasers c| by Urs E. Hochuli, Thomas P. Sciacca, and Charles R. Hurt.
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    a| Washington, D.C. : b| National Aeronautics and Space Administration ; a| [Springfield, Va. : b| For sale by the National Technical Information Service], c| 1973.
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    a| iv, 60 p. : b| ill. ; c| 27 cm.
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    a| NASA technical note ; v| NASA TN D-7307
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    a| Prepared at Goddard Space Flight Center.
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    a| Cover title.
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    a| Bibliography: p. 11.
    520
      
      
    a| Experimental results of a group of theoretically selected cold cathode materials are presented. These tests indicate Ag-CuO, Cu, and Pt-Cu as three new cold cathode materials for sealed-off CO2 lasers. The power output of a test laser with an Ag-CuO cathode and a gas volume of only 50 cu cm varied from 0.72 W to 1.1 W at 3000 hours and still yields 0.88 W after 8000 hours. Gas discharge tubes with Cu cathodes and a volume of 25 cu cm yield lifetimes in excess of 10,000 hours. Gas analysis results, obtained from a similar tube over a period of 3000 hours, look most promising. A Pt-Cu alloy cathode shows an extremely promising V-I characteristic over a period of 2800 hours.
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    a| Mode of access: Internet.
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    a| Carbon dioxide lasers.
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    a| Hurt, Charles R.
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    a| Sciacca, Thomas P.
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    a| United States. b| National Aeronautics and Space Administration.
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    a| Goddard Space Flight Center.
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