25 September 2017 Multiple-beam output high-peak power Nd:YAG/Cr4+:YAG laser for laser ignition
Author Affiliations +
Proceedings Volume 10562, International Conference on Space Optics — ICSO 2016; 105625X (2017) https://doi.org/10.1117/12.2296222
Event: International Conference on Space Optics — ICSO 2016, 2016, Biarritz, France
Alternative propellant combinations for orbital manoeuvring system and reaction-control system require new ignition devices for a new generation of thrusters.

ICSO 2016: International Conference on Space Optics

Biarritz, France

18–21 October 2016

Edited by Bruno Cugny, Nikos Karafolas and Zoran Sodnik


Alternative propellant combinations for orbital manoeuvring system and reaction-control system require new ignition devices for a new generation of thrusters. Such thrusters need to withstand large, from hundred to thousand range, number of cycles. Additional requirements are concerning the replacement of the toxic propellants with green ones. The classical methods of ignition are based on pyrotechnical and electrical effects. Recently, a lot of efforts are made to develop an alternative ignition technology based on solid-state lasers [1]. The energy required for a reliable ignition depends on the working conditions and one alternative to single high-energy laser pulse is a multiple-pulse laser system that allows the focusing of several pulses in a small volume. Single and multipoint ignition [2-5] has been also studied for car engine ignition.

In this work we are reporting on the realization of a compact laser that delivers four independent output beams. The device, shown in Fig. 1a, is made of a composite Nd:YAG/Cr4+:YAG structure. Monolithically resonator was obtained by coating the high-reflectivity mirror on Nd:YAG input side and the out-coupling mirror on the exit surface of Cr4+:YAG.

Figure 1

a A photo of the Nd:YAG/Cr4+:YAG laser with four-beam output is shown. Each laser beam can be focused b) in the same plane, at equal distances from the optics or c) in different points.


The pump was made by four fiber-coupled diode lasers (Jenoptik, Germany) in quasi-continuous wave regime. A simple optical system was designed in order to transfer the pump radiation into Nd:YAG/Cr4+:YAG, keeping the compactness of the device and assuring mm-order distance between each laser beam. The laser pulse energy for each beam was up to 5 mJ with duration below 1 ns. The four beams were focused such as to obtain plasma in points placed in the same plane (Fig. 1b) or in points chosen in different planes (Fig. 1c), in order to access a large volume of the inflammable mixture. This laser device could be used for multiple-point ignition in automobile car engine, natural-gas stationary engines, or orbital manoeuvring thrusters.

This work was financed by the Romanian National Authority for Scientific Research, CNCS-UEFISCDI, project NUCLEU 1647 and project 58/2012 (PN-II-PT-PCCA-2011-3.2-1040) and partially funded from the European Union’s Horizon 2020 Research and Innovation Programme under grant agreement No. 691688.



C. Manfletti and G.Kroupa, Opt. Express, vol. 21, pp. A1126–A1139, Nov. 2013.Google Scholar


G. Dearden and T. Shenton,Opt. Express, Vol. 21, pp. A1113–A1125, Nov. 2013.Google Scholar


T. Taira, S. Morishima, K. Kanehara, N. Taguchi, A.Sugiura, and M. Tsunekane, “World first laser ignited gasoline engine vehicle,” presented at the 1st Laser Ignition Conference (LIC’13),Yokohama,Japan, April 23–25, 2013; paper LIC3-1.Google Scholar


E. Lyon, Z. Kuang, H.Cheng, V. Page, A.T.Shenton, and G. Dearden, J. Phys. D: Appl. Phys., vol. 47,art. 475501, Nov. 2014.Google Scholar


N. Pavel, T. Dascalu, G. Salamu, M. Dinca, N.Boicea, and A. Birtas, Opt. Express, vol. 23, pp. 33028–33037, Dec. 2015.Google Scholar

© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. Dascalu, T. Dascalu, G. Croitoru, G. Croitoru, O. V. Grigore, O. V. Grigore, N. Pavel, N. Pavel, } "Multiple-beam output high-peak power Nd:YAG/Cr4+:YAG laser for laser ignition", Proc. SPIE 10562, International Conference on Space Optics — ICSO 2016, 105625X (25 September 2017); doi: 10.1117/12.2296222; https://doi.org/10.1117/12.2296222


1.1-kW high-efficiency LD-pumped Nd:YAG laser
Proceedings of SPIE (August 14 1998)
Adaptive methods for laser beam control
Proceedings of SPIE (December 09 1993)
Wide-pulse Nd:YAG high-repetition-frequency Q-switch technique
Proceedings of SPIE (September 04 2002)
Amplification of 26-fs, 2-TW pulses in Ti:sapphire
Proceedings of SPIE (April 09 1995)
30KW peak power flash lamp pumped pulsed static Nd YAG...
Proceedings of SPIE (August 31 2009)
Magnetic field ion mitigation for EUV light sources
Proceedings of SPIE (May 05 2005)
1.5 TW 10 Hz Ti sapphire laser system design...
Proceedings of SPIE (June 16 1993)

Back to Top