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Assembly process and optical performances for a golden laser spark-plug device

: Ribes-Pleguezuelo, P.; Pavel, N.; Beckert, E.; Damm, C.; Bodemann, A.; Grigore, O.-V.; Croitoru, G.; Brandus, C.-A.; Vasile, N.-T.; Eberhardt, R.; Tünnermann, A.

Volltext ()

Optical engineering 58 (2019), Nr.6, Art. 065101, 7 S.
ISSN: 0091-3286
ISSN: 0036-1860
ISSN: 1560-2303
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()

The low-stress Solderjet Bumping technique was employed to assemble the optical components of an increased-robustness laser spark-plug ignition device using the low melting alloys 96.5Sn3Ag0.5Cu and 80Au20Sn. A finite-element-method analysis, optical simulations, and a soldering parametrization test were performed to prove that different optical materials (sapphire, ECO-550, D-ZLaF52LA, TAC4, and N-SF11 glasses) could be fastened to the stainless steel body. The assembled spark-plug device featured a passively Q-switched Nd: YAG/Cr4+: YAG composite ceramic medium and delivered laser pulses with energy variable between 2.40 and 4.70 mJ, with 0.8 ns duration, suitable for inducing air breakdown phenomenon and engine combustion.