Optimization of corona-discharge photoionization sources for CO2 lasers

Marchetti, R.; Penco, E.; Armandillo, E.; Salvetti, G.

doi:10.1063/1.331831

Cited by 15 publications

(7 citation statements)

References 9 publications

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“…Dashuk et al [10] reported that the negative streamer propagation velocity is larger than the positive, Murooka and Koyama [16] noted that exactly the opposite has been observed. Zaroslov et al [17] reported that the intensity of radiation emitted from dielectric species was in some cases ten times higher for a negative polarity surface discharge while in the work of Marchetti et al [18], where the efficiency of the sliding discharge as a preionization source for CO 2 lasers was investigated, the number of photoelectrons and hence of hard UV radiation was found to be three times larger in the case of positive polarity.…”

Section: Discussionmentioning

confidence: 97%

The effect of voltage pulse polarity on the performance of a sliding discharge pumped HF laser

Tsikrikas

Serafetinides

1996

J. Phys. D: Appl. Phys.

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The influence of the applied voltage pulse polarity on the performance of a HF laser pumped by a sliding surface discharge is investigated. Details are presented for the polarity dependence of the discharge properties as well as for their relation to the physical processes that affect the sliding discharge evolution. The output energy and efficiency were higher when the initiating or stressed electrode was in relative positive potential, irrespective of which electrode was grounded. The experimental results indicate that for positive polarity the discharge was more uniform, self terminating in type, with reduced electron density and temperature. The increase in output energy and efficiency is attributed to the improvement of the spatial uniformity of laser pumping, to a more efficient utilization of discharge input energy due to an increase in the steady state discharge time phase, as well as to the reduced electron temperature and to the increased steady state voltage which may also result in more efficient laser pumping.

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Section: Discussionmentioning

confidence: 97%

The effect of voltage pulse polarity on the performance of a sliding discharge pumped HF laser

Tsikrikas

Serafetinides

1996

J. Phys. D: Appl. Phys.

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“…By adjusting the length of the path between the electrodes and the field strength the surface discharge can be made self terminating due to the high electron losses because of recombination near the surface. It has been found experimentally, [1], that the production of UV radiation and therefore the electron density in the main discharge region increases with the magnitude of the displacement current. Also, the wavelength of the emitted UV radiation can be influenced by the energy of the corona discharge electrons.…”

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confidence: 97%

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confidence: 99%

“…Also, the wavelength of the emitted UV radiation can be influenced by the energy of the corona discharge electrons. A higher electric field has been observed to produce shorter wave length UV radiation and higher electron density in the main discharge region [1]. The polarity and geometry of the electrodes can influence the preionizer significantly, especially at a large degree of assymmetry of the system [1,2].…”

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confidence: 99%

“…The polarity and geometry of the electrodes can influence the preionizer significantly, especially at a large degree of assymmetry of the system [1,2].…”

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confidence: 99%

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Corona Preionizer For High Repetition Rate TEA Gas Lasers

Goor

Keet²

1989

SPIE Proceedings

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A corona preionization system for a high repetition gas laser is described. The system has been applied to a 200Hz repetition rate TEA CO2 laser with a 1.5x1.5x40cm3 discharge volume. Because the self inductance of the laser head can be kept at a very low value, short excitation pulses and fast rising discharge voltages are possible. Since the preionizer is incorporated in the main circuit and consumes only a small fraction of the total excitation energy, high overall efficiencies can be obtained.High repetition rate transversely excited high pressure gas lasers are found in an increasing number of applications in the fields of material processing, laser radar, optical pumping of dye lasers and far infrared lasers.In order to increase the life time of the laser gas it is important that the preionization source has little or no contribution to the contamination of the gas. X -ray sources are very suitable as a preionizer because they are outside the laser chambre and can produce a very homogeneous density of preionization electrons. However they are relative complex and demand a relative high power. As an alternative UV radiation produced by a corona discharge can also be considered as a preionization source for high repetition rate high pressure gas lasers. The advantages of a corona preionizer are the possibility of making it an integral part of the electrical circuit of the main discharge and its relative low power consumption.In general a self terminating surface discharge is initiated due to a rapidly rising electric field at the surface of a suitable dielectric. The resulting displacement current has an amplitude proportional to the ratio of dielectric constant and thickness of the plate and the applied voltage gradient. Electrons, pulled out of the electrode and the surface of the dielectricum by the high electric field, will be accelerated in the gas and will produce a plasma which travels along the dielectric plate from one electrode to the other. By adjusting the length of the path between the electrodes and the field strength the surface discharge can be made self terminating due to the high electron losses because of recombination near the surface. It has been found experimentally, [1], that the production of UV radiation and therefore the electron density in the main discharge region increases with the magnitude of the displacement current. Also, the wavelength of the emitted UV radiation can be influenced by the energy of the corona discharge electrons. A higher electric field has been observed to produce shorter wave length W radiation and higher electron density in the main discharge region [1].The polarity and geometry of the electrodes can influence the preionizer significantly, especially at a large degree of assymmetry of the system [1,2]. Abstract A corona preionization system for a high repetition gas laser is described. The system has been applied to a 200Hz repetition rate TEA CO laser with a

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Magnetic-spiker excitation of gas-discharge lasers

Taylor

Leopold

1994

Appl. Phys. B

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Optimization of corona-discharge photoionization sources for CO2 lasers

Cited by 15 publications

References 9 publications

The effect of voltage pulse polarity on the performance of a sliding discharge pumped HF laser

The effect of voltage pulse polarity on the performance of a sliding discharge pumped HF laser

Corona Preionizer For High Repetition Rate TEA Gas Lasers

Magnetic-spiker excitation of gas-discharge lasers

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