New multiplexed all solid state pulser for high power wide aperture kinetically enhanced copper vapor laser

Ghodke, D. V.; Muralikrishnan, K.; Singh, Brij Mohan

doi:10.1063/1.4829075

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…Subsequently, the auxiliary IGBT T3 is switched on to make sure that the residual voltage on C ′ is zero, thereby reducing jitter [13]. This circuit is also referred to as an all solid-state pulse forming circuit and can be operated at a fixed frequency for which it is designed [14]. The PRF of the laser is 9 kHz and delivers an optical power of ~40 W in a 1 + 1 MOPA (master oscillator and power amplifier) configuration at a laser head pressure of 40 mbar and buffer gas flow rate of 2 mbar.…”

Section: Experimental Set Upmentioning

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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Section: Experimental Set Upmentioning

confidence: 99%

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

et al. 2020

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“…The copper vapor laser (CVL) is a visible laser source with high average power, requiring pulse voltage for its excitation [1]. The pulse-generating unit (PGU) delivers the required pulse voltage excitation, which serves two purposes [1,2]: the first is to create population inversion and the other is to impart the necessary thermal energy to obtain the required operating temperature for copper vapor generation. The PGU is designed to deliver an excitation voltage of ∼13 kV with a rise time of less than 100 ns [2].…”

Section: Introductionmentioning

confidence: 99%

“…The pulse-generating unit (PGU) delivers the required pulse voltage excitation, which serves two purposes [1,2]: the first is to create population inversion and the other is to impart the necessary thermal energy to obtain the required operating temperature for copper vapor generation. The PGU is designed to deliver an excitation voltage of ∼13 kV with a rise time of less than 100 ns [2]. This complex excitation pulse requirement makes it difficult to efficiently transfer the electrical energy into the plasma, generated inside the laser head.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the discharge plasma impedance of copper vapor laser

et al. 2022

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In the pursuit to analyze the impedance of copper vapor lasers (CVLs) in different conditions, a novel approach has been proposed in this paper. The underdamped behavior of the voltage waveform across the CVL is leveraged to compute the impedance of high-voltage discharge plasma in the laser. This methodology provides an accurate idea of the discharge plasma resistance and inductance as it is calculated on the basis of experimental voltage waveforms obtained from the laser system. The laser head inductance remains almost fixed and equivalent to ∼0.47 µH whereas the laser resistance changes between 34 Ω and 11 Ω depending on the discharge condition and its constituents. A critical evaluation of CVL impedance is done in all experimentally possible conditions, and a methodology has been proposed to maintain the CVL impedance, which results in the power stability of the laser in oscillator–amplifier configuration. The laser impedance variation w.r.t. time, pressure, operating voltage and electrode pin configuration has been investigated. The impact of the localized electric field at the electrode on the laser resistance has also been emphasized in this paper. A good concurrence exists between the calculated laser impedance and its experimental behavior.

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“…SMPGs belong to the class of converting technology devices that serve to amplify the peak power of the pulse on the load [3,4]. They are widely used in a number of electric discharge technologies, where it is necessary to have powerful current pulses of submicrosecond duration with a sharp leading edge, for example, for powering microwave devices or pumping gas lasers on metal vapors [5,6]. In recent years, the relevance of using these devices has increased significantly with the need for air purification from sulfur dioxide [7,8] and wastewater disinfection [9,10].…”

mentioning

confidence: 99%

“…where the inductance L SR is determined by the formula, as for the toroidal core (6). It was determined that the initial voltage U С1 on the capacitor С 1 is the maximum voltage when the core is magnetized L SR .…”

mentioning

confidence: 99%

Current-voltage characteristics of single-stage semiconductor magnetic pulse generators with a distinctive structure of the conversion link in the input circuit

Khrysto

2023

Electrical Engineering & Electromechanics

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Introduction. The main feature of the semiconductor magnetic pulse generators (SMPGs) is a slow accumulation of energy in the primary capacitor and its rapid introduction into the load by using a series of sequentially connected magnetic compression stages. Initially, these devices were mainly used for pumping gas lasers, but over the last decade SMPGs have been increasingly used in electric discharge technologies for water purification and air ionization to remove toxic impurities. At the same time, along with the practice of using these devices, development has also been achieved in the principles of their design and methods of mathematical modeling. Problem. The main drawback of the existing theory of SMPG’s stationary oscillations mode is an adoption of the saturable reactor (SR) model in approximation of the static magnetization curve of its core, as well as unidirectional nature of the energy transfer from the generator to the load. In most publication the exchange processes between the power source and SR are still not covered. Goal. Study of electrical and energy characteristics of low-voltage single-stage SMPG devices with series and parallel conversion stages in the charging circuit. Methodology. To achieve the set goal, this work uses comprehensive approach relayed on technical tools of setting up the experiment, numerical methods for processing measurement results, as well as an analytical method for describing electromagnetic processes in single-stage SMPG circuits. Results. The closed current-voltage characteristics of the SR are obtained, according to which the numerical calculations of the integral magnetic and energy characteristics of the proposed models are carried out. The features of the longitudinal capacitance charging process in a SMPG’s circuit with a parallel conversion stage, which occurs simultaneously in two adjacent circuits, are explained. Analytical expressions to describe the dynamics of magnetic flux density in the SR’s core as a time-depended function are derived. Based on the obtained hysteresis curve of the core, the exchange processes of energy transfer between the power source and the SR are explained. Practical value. The results of the research can be applied in the development of low-voltage SMPG circuits with improved energy-dynamic parameters.

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New multiplexed all solid state pulser for high power wide aperture kinetically enhanced copper vapor laser

Cited by 4 publications

References 10 publications

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

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

Analysis of the discharge plasma impedance of copper vapor laser

Current-voltage characteristics of single-stage semiconductor magnetic pulse generators with a distinctive structure of the conversion link in the input circuit

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