Scaling and performance of co2-lasers at supra-atmospheric pressure

A.L.S. Smith, J. Mellis

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The performance of a compact uv photo-preionized TE laser is studied in the pressure range 1-5 bar. As the pressure is increased, the laser pulse shape is little altered, but both the peak power and the total output pulse energy increase significantly with pressure, even for constant input electrical energy. For various gas mixtures and excitation source capacitors the measurements suggest approximate output energy scaling with the product of the source charge per unit electrode area [C.m-2] and the molecular partial pressure [CO2+N2+CO]. This is explained in terms of the pressure-dependent discharge impedance. An input-energy-related discharge instability limits the optimum laser pressure to 1.5-2.5 bar, and we show that, at constant input energy, the instability boundary depends on the molecular partial pressure alone. The pre-ionization photo-electron yield varies negligibly with pressure, but the discharge tolerance to added oxygen decreases asp -3 top -4, dependent on gas mixture. Nevertheless sealed operation for >105 shots has been obtained with a 5% CO25% CO3% N22% H285% He gas mixture at a total pressure of 5 bar.
LanguageEnglish
Pages171-179
Number of pages9
JournalApplied Physics B: Lasers and Optics
Volume37
Issue number3
DOIs
Publication statusPublished - 15 Feb 1985

Fingerprint

atmospheric pressure
scaling
lasers
gas mixtures
partial pressure
energy
output
electric power
pulses
shot
capacitors
impedance
ionization
electrodes
oxygen
products
excitation
electrons

Keywords

  • scaling
  • performance
  • CO2 lasers
  • supra-atmospheric pressure

Cite this

Smith, A.L.S. ; Mellis, J. / Scaling and performance of co2-lasers at supra-atmospheric pressure. In: Applied Physics B: Lasers and Optics. 1985 ; Vol. 37, No. 3. pp. 171-179.
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Scaling and performance of co2-lasers at supra-atmospheric pressure. / Smith, A.L.S.; Mellis, J.

In: Applied Physics B: Lasers and Optics, Vol. 37, No. 3, 15.02.1985, p. 171-179.

Research output: Contribution to journalArticle

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AU - Mellis, J.

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N2 - The performance of a compact uv photo-preionized TE laser is studied in the pressure range 1-5 bar. As the pressure is increased, the laser pulse shape is little altered, but both the peak power and the total output pulse energy increase significantly with pressure, even for constant input electrical energy. For various gas mixtures and excitation source capacitors the measurements suggest approximate output energy scaling with the product of the source charge per unit electrode area [C.m-2] and the molecular partial pressure [CO2+N2+CO]. This is explained in terms of the pressure-dependent discharge impedance. An input-energy-related discharge instability limits the optimum laser pressure to 1.5-2.5 bar, and we show that, at constant input energy, the instability boundary depends on the molecular partial pressure alone. The pre-ionization photo-electron yield varies negligibly with pressure, but the discharge tolerance to added oxygen decreases asp -3 top -4, dependent on gas mixture. Nevertheless sealed operation for >105 shots has been obtained with a 5% CO25% CO3% N22% H285% He gas mixture at a total pressure of 5 bar.

AB - The performance of a compact uv photo-preionized TE laser is studied in the pressure range 1-5 bar. As the pressure is increased, the laser pulse shape is little altered, but both the peak power and the total output pulse energy increase significantly with pressure, even for constant input electrical energy. For various gas mixtures and excitation source capacitors the measurements suggest approximate output energy scaling with the product of the source charge per unit electrode area [C.m-2] and the molecular partial pressure [CO2+N2+CO]. This is explained in terms of the pressure-dependent discharge impedance. An input-energy-related discharge instability limits the optimum laser pressure to 1.5-2.5 bar, and we show that, at constant input energy, the instability boundary depends on the molecular partial pressure alone. The pre-ionization photo-electron yield varies negligibly with pressure, but the discharge tolerance to added oxygen decreases asp -3 top -4, dependent on gas mixture. Nevertheless sealed operation for >105 shots has been obtained with a 5% CO25% CO3% N22% H285% He gas mixture at a total pressure of 5 bar.

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