Scaling and passively Q-switch operation of a Nd:YAG laser pumped laterally through a YAG prism

Dascalu, T.; Salamu, Gabriela; Sandu, O.; Dinca, Mihai; Pavel, N.

doi:10.1016/j.optlastec.2014.10.017

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…This allows a separation of the temperature-sensitive pumping source from the engine. Kroupa et al, 18 Schwarz et al 19 and Dascalu et al 28 show other possible pumping concepts. The small-sized laser resonator generates short pulses (0.523 ns) with ;10 mJ single energy.…”

Section: Pql Spark Plugmentioning

confidence: 96%

Pulse train ignition with passively Q-switched laser spark plugs

Lorenz

Bärwinkel

Stäglich

et al. 2015

International Journal of Engine Research

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Leaner burning and downsizing are two concepts pursued by engine developers to reduce fuel consumption and emissions. Both approaches lead to increasing challenges concerning ignition, as these concepts are typically associated with an increase in flow velocity and degree of turbulence as well as raised pressure at the moment of ignition. In this context, the use of miniaturized passively Q-switched laser spark plugs with pulse train ignition is considered as a promising alternative to conventional spark plugs.However, the application of these passively Q-switched laser spark plugs inevitably leads to the question of optimum pulse train parameters. For a better understanding, this study deals with improved flame formation by passively Qswitched laser pulse train ignition under engine-like conditions. The entire ignition process is investigated with a special focus on interactions of consecutive pulses. Therefore, three methods are combined: energy transfer measurements from laser pulse to plasma with high temporal and spatial resolution show the breakdown process depending on different pressures and fluid mixtures. The temperature decrease in the induced plasma is analyzed with measurement strategies for temporal high-resolved plasma spectroscopy especially adapted to passively Q-switched lasers. In combination with high-speed schlieren measurements, the changing local ignition conditions during pulse train ignition are demonstrated. The experiments show how consecutive pulses interact and contribute to the ignition in case of a gas flow. The used prototypes of laser spark plugs are provided by Robert Bosch GmbH.

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Section: Pql Spark Plugmentioning

confidence: 96%

Pulse train ignition with passively Q-switched laser spark plugs

Lorenz

Bärwinkel

Stäglich

et al. 2015

International Journal of Engine Research

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“…The laser medium was a Nd:YAG/Cr4+:YAG ceramic structure (Baikowski Co., Japan) that consisted of a 8.0-mm long, 1.0-at.% Nd:YAG ceramic, optically-bonded to a Cr4+:YAG ceramic with saturable absorption (SA) [8,16]. The initial transmission of Cr4+:YAG SA was around 40%.…”

Section: Experimental Investigationmentioning

confidence: 99%

Aspects of experimental investigations of laser plug ignition use at spark ignition engine

Done

2017

MATEC Web Conf.

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Abstract. Nowadays, the necessity of pollutant emissions reduction brings to the fore new technologies developed for a better control of the combustion process. Ignition is the process of starting radical reactions until a selfsustaining flame has developed and strongly affects the formation of pollutants. Among the new technologies used for ignition and combustion control, the Laser Plug Ignition system is defined as an innovative technology which overcomes several limitations of conventional spark ignition. Laser ignition technology presents many advantages for engine operating control, engine performance improvement and pollutant emissions reduction. The objective of the paper is the experimental research of the laser ignition used in the spark ignition engine. The laser plug ignition system was mounted on an experimental spark ignition engine and tested at the regime of 90% load and 2800 rpm and dosage, =1. The experimental results present the influence of laser ignition on different engine parameters compared to electric spark ignition. The influence on in-cylinder pressure, heat release rate, engine efficiency and pollutant emissions level is analyzed. Compared to a conventional spark plug, a laser ignition system assures efficient engine operation at lean dosages.

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“…Due to sequential x-y-scanning of the complete profile, the method is beneficial for inspection of more complex spatial pulse profiles, as they may appear in other pump geometries of PQLs [17,19].…”

Section: Local Energy Depositionmentioning

confidence: 99%

“…The laser medium can be pumped by fiber-coupled diodes. Other pumping concepts are discussed by Kroupa et al [17], Schwarz et al [18] and Dascalu et al [19]. A slight self-induced aperture effect of the saturable absorber results in high beam quality.…”

Section: Introductionmentioning

confidence: 99%

Characterization of energy transfer for passively Q-switched laser ignition

Lorenz¹,

Bärwinkel²,

Heinz³

et al. 2015

Opt. Express

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Miniaturized passively Q-switched Nd:YAG/Cr 4+ :YAG lasers are promising candidates as spark sources for sophisticated laser ignition. The influence of the complex spatial-temporal pulse profile of such lasers on the process of plasma breakdown and on the energy transfer is studied. The developed measurement technique is applied to an open ignition system as well as to prototypes of laser spark plugs. A detected temporal breakdown delay causes an advantageous separation of plasma building phase from energy transfer. In case of fast rising laser pulses, an advantageous reduction of the plasma breakdown delay occurs instead. 4730-4739 (2007). 12. T. X. Phuoc, "Laser spark ignition: experimental determination of laser-induced breakdown thresholds of combustion gases," Opt.

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Scaling and passively Q-switch operation of a Nd:YAG laser pumped laterally through a YAG prism

Cited by 9 publications

References 18 publications

Pulse train ignition with passively Q-switched laser spark plugs

Pulse train ignition with passively Q-switched laser spark plugs

Aspects of experimental investigations of laser plug ignition use at spark ignition engine

Characterization of energy transfer for passively Q-switched laser ignition

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