Efficiency of Pumping of the Active Medium of Metal Vapor Lasers: Gas-Discharge Tubes with Electrodes in the Hot Zone of the Discharge Channel

Yudin, N. A.; Yudin, N. N.

doi:10.1007/s11182-016-0840-6

Cited by 5 publications

(7 citation statements)

References 7 publications

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“…The general approach to solving of this problem -is the resonance charging of the circuit capacitive components with the further discharging of them into the active medium, what can be done, at least, by the two ways. The first was studied in [12] where the discharging of the storage capacitor by the high-rate switch through the active medium of the GDT, which electrodes are placed in the hot zone of the discharge channel, was proposed. The second is suitable for the pumping of the active medium of the GDT, which electrodes are placed in the cold buffer zone.…”

Section: Resultsmentioning

confidence: 99%

The Efficiency of the Pumping of the Lasers Based on Self-Terminating Atomic Transitions Operating in the Energy Input Cut-Off Mode

et al. 2018

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Abstract. The analysis of the electro-physical processes in the discharge circuit of the lasers based on the self-terminating transitions of metal atoms (LSTM) and the electrodes placed in the cold buffer zones of the gas discharge tube (GDT) is occurred. That design of the GDT can provide the efficient lasing at the reduction of the current flowing through the switch to zero after the charging of the capacitive components of the circuit from the storage capacitor. Under the circumstances the pumping of the active medium is determined by the energy input from the peaking capacitor and, consequently, the efficiency of the pumping can be increased by an order of magnitude, if (using a managed switch) the energy input into the active medium from the storage capacitor is "cut-off" after charging the capacitive components of the circuit. It was shown that the efficiency values of ~ 9-11 % and of ~ 5-6 % for the copper and gold vapor, lasers could be achieved.

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Section: Resultsmentioning

confidence: 99%

The Efficiency of the Pumping of the Lasers Based on Self-Terminating Atomic Transitions Operating in the Energy Input Cut-Off Mode

et al. 2018

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“…The phantom current depends upon the buffer gas pressure inside the laser tube, discharge constituents, operating voltage, electrode geometry, etc [2]. Through an electrophysical approach, the processes limiting the frequency and the energy characteristics of radiation in the laser discharge are identified and it has been reported that a laser efficiency of up to 10% can be attained by reducing the pre-pulse electron concentration in metal vapor lasers (MVLs) [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Dependence of phantom current in a metal vapor laser on electrode geometry

et al. 2020

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It is observed that the discharge current in a copper vapor laser rises prior to the voltage breakdown. This current, which appears almost 50 ns before the discharge breakdown and is equivalent to almost 70% of the peak current at the time of breakdown, is termed the phantom current. It is reported that by reducing the residual electron density (phantom current) in a metal vapor laser (MVL), its performance can be significantly improved. Metallic pins are used in the electrode to facilitate discharge in the long discharge tube. Besides augmenting the discharge during the initial stage, it has a significant impact on the laser performance. In this paper, we find out the correlation between the phantom current and the electrode pin geometry and then present the optimum electrode geometry for improved laser performance. It was observed that the number of pins in the electrode affects the localized electric field in the nearby region and plays a dominant role in the quantum of the phantom current in the discharge tube of the laser. The MVL system was tested with electrodes that had a different number of pins (zero, eight and 36) and it was found that the phantom current is minimum when the electrode has zero pins and highest with an eight-pin electrode.

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“…These electrons reduce plasma impedance and, as a result, introduce delay between the current and voltage pulse. These electrons have some adverse effects that limit the repetition rate and therefore limit the amount of energy that can be extracted from the laser tube [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The instability of laser plasma at the beginning of discharge is another problem that limits the laser's operation in higher pressures [9,10]. When the gas pressure reaches 40-50 torr in CVL plasma, the discharge in the cathode region becomes unstable.…”

Section: Introductionmentioning

confidence: 99%

“…This thermal instability enhances the local heating, increases the gas temperature, and decreases its density [10,12,13,16]. Among the investigated methods for improving the lasing characteristics, those deserving the greatest attention are an increase in the pump peak power by increasing the steepness of the leading edge of the excitation pulses, an increase in the average energy of electrons at the beginning of a current pulse to values ensuring a much more effective pumping of the upper active level, using copper electrodes, and an increase in the rate of plasma recombination during the interpulse period [9,12,13]. To improve the discharge stability in CVL, different designs of electrodes and other methods, such as placing the electrodes in a hot buffer zone and sharpening the leading edge of pumping voltage pulse, were introduced [9,11,[17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Stable and efficient operation of a large-bore copper vapor laser with funnel-shaped, grooved copper electrodes

et al. 2017

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Using an appropriate design of electrodes and adjustment of the thyratron decoupling circuit as a high-repetition-rate and high-voltage switch, very stable operation of a copper vapor laser at high pressures was obtained. This was achieved by canceling the intense filamentation in the laser plasma at the higher pressures. The transverse grooves on the inner surface of the funnelshaped copper electrodes permit operation of the laser up to 100 torr. This design reduces the cathode-fall voltage, and as a result reduces the thermal loading in the cathode-fall region. The optimum pressure was 80 torr. At this condition the output power was more than that observed with expensive molybdenum electrodes in a similar laser system.

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Efficiency of Pumping of the Active Medium of Metal Vapor Lasers: Gas-Discharge Tubes with Electrodes in the Hot Zone of the Discharge Channel

Cited by 5 publications

References 7 publications

The Efficiency of the Pumping of the Lasers Based on Self-Terminating Atomic Transitions Operating in the Energy Input Cut-Off Mode

The Efficiency of the Pumping of the Lasers Based on Self-Terminating Atomic Transitions Operating in the Energy Input Cut-Off Mode

Dependence of phantom current in a metal vapor laser on electrode geometry

Stable and efficient operation of a large-bore copper vapor laser with funnel-shaped, grooved copper electrodes

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