Novel miniaturized high-energy Nd-YAG laser for spark ignition in internal combustion engines

Kroupa, Gerhard; Franz, Georg; Winkelhofer, Ernst

doi:10.1117/1.3072958

Cited by 69 publications

(16 citation statements)

References 10 publications

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“…We think this will be the lowest energy ever reported for laser igntion of a real automobile engine. High-brightness, passively Q-switched micro-laser can reduce the ignition energy dramatically compared with previous ignition lasers (Kroupa, 2009) and a spark plug. The operation of an engine ignited by a single laser pulse is quite stable and no miss-ignitions appeared during our experiment for several tens of minutes.…”

Section: Ignition In Real Automobile Enginementioning

confidence: 99%

Micro-Solid-State Laser for Ignition of Automobile Engines

Tsunekane¹,

Inohara²,

Kanehara³

et al. 2010

Advances in Solid State Lasers Development and Applications

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Section: Ignition In Real Automobile Enginementioning

confidence: 99%

Micro-Solid-State Laser for Ignition of Automobile Engines

Tsunekane¹,

Inohara²,

Kanehara³

et al. 2010

Advances in Solid State Lasers Development and Applications

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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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“…As a result, interest in this field reemerged around 2000 and various organizations have made attempts to develop a viable laser ignition system. Kroupa et al [32] and simultaneously Woodruff & Dustin McIntyre et al [33] have tried to develop an endpumped laser-per-cylinder Nd:YAG system. Weinrotter, Herdin et al [34] have tried to develop a split system wherein a long laser pulse from a pump laser is transmitted through a optical fiber to end pump a laser gain medium equipped with a saturable absorber installed in the spark plug well of the engine.…”

Section: Laser Ignitionmentioning

confidence: 99%