A sealed high-repetition-rate TEA CO<sub>2</sub>laser

Pace, Paul; Lacombe, M.

doi:10.1109/jqe.1978.1069772

Cited by 44 publications

(5 citation statements)

References 37 publications

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“…Prince and Garscadden (1975) observed that NO; and NOT are dominant negative ions in a low pressure (-1 Torr) C02-N2-He gas mixture flowing afterglow discharge. Shields er a1 (1976) and Pace and Lacomb (1978) have studied the negative ion processes occurring in a pulsed TEA CO2 laser plasma. They found that the addition of small amounts of H2 and CO, which kept the oxygen concentration below 2 percent, reduced the CO2 decomposition to allow sealed operation of a CO2 laser (Pace and Lacombe 1978).…”

Section: Introductionmentioning

confidence: 99%

Negative ion formations and their effects on the electron temperature in CO₂-N₂-He mixture gas discharges

Ono¹,

Teii²

1984

J. Phys. D: Appl. Phys.

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Formation of negative ions and their influence on the electron temperature of a CO2-N2-He mixture gas discharge have been studied both theoretically and experimentally. The results show that (i) CO3- and O2- increase with increasing gas pressure P, while O- decreases as P increases, (ii) all negative ion densities increase with increasing electron density ne; (iii) the relation between the electron temperature Te and the CO concentration in the discharge has been measured and Te decreases with increasing CO concentration. This implies that Te, increased by the electron attachment processes, is decreased by the electron detachment processes involving CO molecules. (iv) Experimentally observed Te agree well with those obtained from present theoretical calculations.

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Section: Introductionmentioning

confidence: 99%

Negative ion formations and their effects on the electron temperature in CO₂-N₂-He mixture gas discharges

Ono¹,

Teii²

1984

J. Phys. D: Appl. Phys.

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“…As has previously been shown (22), in order to increase the output energy the necessary increase in input energy leads to additional CO, decomposition and thus additional concentrations of the gaseous dissociation products. This increased concentration of the dissociation products alters the negative-ion concentrations and eventually leads to arc formation and cessation of laser action (14)(15)(16)22).…”

Section: Operatiorzal Lifetimesmentioning

confidence: 91%

“…This increased concentration of the dissociation products alters the negative-ion concentrations and eventually leads to arc formation and cessation of laser action (14)(15)(16)22). If it is found desirable to increase the laser output energy it may be necessary to use one of the aforementioned alternative methods or perhaps return to an unsealed flowing gas system depending upon which of the methods is most compatible with portable operation.…”

Section: Operatiorzal Lifetimesmentioning

confidence: 99%

Frequency characteristics of a miniature transversely excited CO₂ laser

Pace¹,

Lacombe²

1979

Can. J. Phys.

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A small, single-frequency TE-C02 laser has been constructed and opel-ated under sealed conditions. Measurements indicate that an output energy of 15 mJ is obtained inn 45-ns (FWHM) 100-kW pulse followed by a 2-ps-long tail. Single-longitudinal-mode operation was obtained by the insertion of a 7.5 mm diameter iris into an 18-cm-long cavity. The discharge volume was I0 mm x I0 mm x 100mm. The laser was operated using a gas mixture containing H2:CO:C02:N2 in the proportions 20:30:250: 100 at ;I total of 54 kPa. Using this mixture over lo6 pulses have been obtained under sealed conditions. The frequency of the laser was controlled by locking it to a reference CW loczll oscillator using a computing-counter controlled feedback technique. Results of the experiments indicate the pulse-to-pulse standard deviation of the beat frequency to be f 500 kHz. the long term drift being controlled by the stabilization system.

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“…Operation of TEA lasers at repetition rates over 2 or 3 pulses per second can only be achieved by changing the gas in the discharge volume [10][11][12] to remove discharge products and thermal Instabilities which would otherwise lead to arcing. In this laser gas flow across the electrodes is achieved by the use of a tangential fan, whose outlet is matched to the discharge region.…”

Section: Pricementioning

confidence: 99%

<title>Pulsed CO<formula><inf><roman>2</roman></inf></formula> Lasers</title>

Price

1980

SPIE Proceedings

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A number of pulsed carbon dioxide lasers have been developed to form the basis of laser systems operating at a wavelength of 10.6 microns. A compact sealed -off CO2 TEA laser which has an output power of 220 kW and a lifetime in excess of 106 pulses, is at an advanced stage of development.This laser employs trigger wire initiation of the main discharge. Arc array initiation has also been employed to provide a means of extending the stable operating regime. As a consequence, output powers in excess of 1.2 MW have been achieved from a sealed -off polarised laser.In addition, an experimental trigger wire initiated laser employing a tangential fan to produce transverse gas flow in the active discharge region, has been operated at repetition rates of up to 100 Hz. AbstractA number of pulsed carbon dioxide lasers have been developed to form the basis of laser systems operating at a wavelength of 10.6 microns. A compact sealed-off CC>2 TEA laser which has an output power of 220 kW and a lifetime in excess of 10 6 pulses, is at an advanced stage of development. This laser employs trigger wire initiation of the main discharge. Arc array initiation has also been employed to provide a means of extending the stable operating regime. As a consequence, output powers in excess of 1.2 MW have been achieved from a sealed-off polarised laser. In addition, an experimental trigger wire initiated laser employing a tangential fan to produce transverse gas flow in the active discharge region, has been operated at repetition rates of up to 100 Hz.

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A sealed high-repetition-rate TEA CO₂laser

Cited by 44 publications

References 37 publications

Negative ion formations and their effects on the electron temperature in CO₂-N₂-He mixture gas discharges

Negative ion formations and their effects on the electron temperature in CO₂-N₂-He mixture gas discharges

Frequency characteristics of a miniature transversely excited CO₂ laser

<title>Pulsed CO<formula><inf><roman>2</roman></inf></formula> Lasers</title>

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A sealed high-repetition-rate TEA CO2laser

Cited by 44 publications

References 37 publications

Negative ion formations and their effects on the electron temperature in CO2-N2-He mixture gas discharges

Negative ion formations and their effects on the electron temperature in CO2-N2-He mixture gas discharges

Frequency characteristics of a miniature transversely excited CO2 laser

<title>Pulsed CO<formula><inf><roman>2</roman></inf></formula> Lasers</title>

Contact Info

Product

Resources

About

A sealed high-repetition-rate TEA CO₂laser

Negative ion formations and their effects on the electron temperature in CO₂-N₂-He mixture gas discharges

Negative ion formations and their effects on the electron temperature in CO₂-N₂-He mixture gas discharges

Frequency characteristics of a miniature transversely excited CO₂ laser