A SEALED HIGH-REPETITION-RATE TEA CO2 LASER

Authors
  1. Pace, P.W.
  2. Lacombe, M.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
A compact atmospheric pressure CO2 laser utilizing a double-discharge technique has been constructed and operated at repetition rates to 100 pulses/s. With the addition of small amounts of hydrogen and carbon monoxide to give a gas mixture of He:N2:CO2:CO:H2=69.3:11:15:4:0.7, sealed operational lifetimes exceeding 2 x E6 pulses have been obtained. Operating in this mode, the output energy density is about 8-9 J/I at repetition frequencies of 30-40 pulses/s for input energy densities of 60-70 J/I. The operation of the sealed laser has been studied by means of mass spectroscopic measurements of the gas mixture. It has been determined that sealed operation is possible as long as the oxygen concentration is kept below 1-2 percent. It has also been found that the addition of small amounts of H2 and CO will keep the oxygen concentration below 2 percent by reducing the CO2 decomposition, allowing sealed operation.
Date of publication
01 Jan 1978
Number of Pages
12
Reprinted from
IEEE J of Quantum Electronics, vol QE-14, no 4, 1978, p 263-274
DSTKIM No
78-02733
CANDIS No
83418
Format(s):
Hardcopy;Originator's fiche received by DSIS

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