The 6th Laser Ignition Conference 2018(LIC2018)


April 25 Wed.

Joint Session: LIC+PLD+SLPC Joint Session 1
Chairs: Kunihiko Washio(Paradime Research, Japan)
Takahisa Jitsuno(Osaka University, Japan)
Takunori Taira(Inst. material Science, Japan)

Room 302

Start End Session No. Title Speaker Description
13:30 13:45 Opening Remarks Masahiro Tsukamoto 1, Takahisa Jitsuno1, Takunori Taira 2
1Osaka Univ., Japan,
2Inst. material Science, Japan
13:45 14:15 SLPC5j-1Invited Ab-initio large-scale simulation for initial stage of laser damage in transparent nano-materials Kazuhiro Yabana1, Mitsuharu Uemoto1, Shunsuke A. Sato2, Yuta Hirokawa3, Taisuke Boku1
1Center for Computational Sciences, University of Tsukuba, Japan
2Max Planck Institute for the Structure and Dynamics of Matter, Germany
3Graduate School of Systems and Information Engineering, University of Tsukuba, Japan
We calculate energy transfer from femtosecond laser pulse to 3D nano-materials solving Maxwell equations for light electromagnetic fields and ab-initio time-dependent Kohn-Sham equation for quantum electron dynamics simultaneously.
14:15 14:45 SLPC5j-2Invited High throughput surface texturing of embossing rollers with fs-laser and polygon line scanner in fully synchronized mode Beat Jaeggi1, 2, Adrian Stirnimann1, Guido Hennig3, Beat Neuenschwander1
1Institute for Applied Laser, Photoncis and Surface technolpogies ALPS, Bern University of Applied Sciences, Switzerland
2LASEA Switzerland, Switzerland
3Daetwyler-Graephics AG, Switzerland
The combination of a polygon line scanner with a rotating roller, fully synchronized to a new high power fs laser, allows laser micromachining with highest precision and high throughput. We will present actual results from the European APPOLO Project.
14:45 15:15 PLDj-1Invited Mechanisims of laser damage in optical components for PW-class laser systems Stavros G Demos, Alexei A Kozlov, Kyle Kafka, James B Oliver, Semyon Papernov, Brittany Hoffman, Terrance J Kessler, Sheryl M Gracewski, John C Lambropoulos
University of Rochester, USA
We investigate the mechanisms of laser-induced damage and ensuing material modifications on multilayer dielectric mirrors and gratings. Thermomechanical modeling combined with analysis of damage morphologies provides insight into the energy deposition and relaxation pathways.
15:15 15:45 Break

Joint Session: LIC+PLD+SLPC Joint Session 2
Chair: Takahisa Jitsuno(Osaka University, Japan)

Room 302

Start End Session No. Title Speaker Description
15:45 16:15 PLDj-2Invited UV-induced aging leading to laser damage in the bulk of fused silica Frank R Wagner, Alexandre Beaudier, Jean-Yves Natoli
Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, France
Results on material modifications observed by photoluminescence in the bulk of fused silica during UV S-on-1 tests show modifications in the color center concentrations before the occurrence of damage and help predicting fatigue damage.
16:15 16:45 LICj-1Invited Ultrafast laser direct writing of periodic nanostructure in bulk semiconductor crystals Yasuhiko Shimotsuma
Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Japan
Self-assembled periodic nanostructures in bulk semiconductor crystals are photoinduced by ultrafast laser pulses. The formation mechanism of these nanostructures in bulk semiconductor crystal could be influenced by the transition type and the bandgap energy. Particularly, the electronic stress induced by the deformation potential of electronic states is considered to be one of important key for nanostructure formation.
16:45 17:15 LICj-2Invited One-shot 3D giant-pulse micro-laser processing by LCOS direct control Yasuki Sakurai1, 2, Yuji Hotta1, Ryohei Otowa1, Masashi Nishitateno1, Lihe Zheng2, Hiroshi Yamamoto2, Takunori Taira2
1Santec corporation, Japan
2Institute of molecular science, Japan
We propose the one-shot 3D material processing with spatially modulated giant-pulse micro-laser output by LCOS direct control. The fine structured organic semiconductor film has been fabricated by MW-class 532nm beam exposer.
17:15 17:20 Closing of Joint Session
April 26 Thu.

LIC1: Advanced ignition systems and applications (1)
Chair: Geoffrey Dearden(University of Liverpool, UK)

Room 302

Start End Session No. Title Speaker Description
9:00 9:05 Opening
9:05 9:30 LIC7-4Invited Expanding real world applications by ubiquitous power lasers based on giant micro-photonics Yuji Sano
ImPACT, Japan Science and Technology Agency, Japan
Giant micro-photonics is an indispensable technology to realize ubiquitous power lasers. ImPACT, a five-year national program until March 20l9, is strongly supporting R&Ds on the giant micro-photonics to materialize ultra-compact high-power lasers and various applications.
9:30 10:00 LIC1-1Invited Laser ignition of quiescent and flowing methane/air-mixtures under elevated pressures using a passively Q-switched laser Mark Bärwinkel, Dieter Brüggemann
University of Bayreuth, Germany
A passively Q-switched laser ignition system is applied to ignite quiescent and flowing methane/air-mixtures under elevated pressures. Special emphasis lies on lean mixtures. The effective focal length of the focusing line is varied to change the focal point properties.
10:00 10:15 LIC1-2 Influence of ignition position of internal combustion engine with laser-induced breakdown ignition Genki Momose1, Takeshi Saito1, Eiichi Takahashi2, Hirohide Furutani2
1Meisei University, Japan
2The National Institute of Advanced Industrial Science and Technology, Japan
We investigated the influence of ignition position on the combustion state and engine performance in a laser-induced breakdown ignition engine.
10:15 10:30 LIC1-3 Experiments on laser cleaning of sooted optical windows Kazuki Okada, Yuto Ito, Wookyung Kim, Tomoyuki Johzaki, Shin-ichi Namba, Takuma Endo
Hiroshima University, Japan
Transparent glass plates were artificially sooted, and they were repetitively irradiated by 1064-nm laser. An explosive air flow normally away from the glass plate was induced by the laser irradiation of the soot.
10:30 10:45 LIC1-4 Benchmark of a time and space resolved numerical energy transfer model for ns laser pulses at 1064 nm in gaseous propellants Michael Boerner, Michael Oschwald
Institute of Space Propulsion, German Aerospace Centre (DLR), Germany
A numerical energy transfer model for focused nanosecond laser pulses at 1064 nm in gaseous media and discretized in time and space is presented and tested against published experimental data.
10:45 11:00 Break

LIC2: Advanced ignition systems and applications (2)
Chair: Nobuyuki Kawahara(Okayama Univ., Japan)

Room 302

Start End Session No. Title Speaker Description
11:00 11:30 LIC2-1Invited Recent development of a sub-nanometer flattening using a non-uniform optical field Takashi Yatsui
School of Engineering, University of Tokyo, Japan
We have developed sub-nanometer scale flattening process of the near-field etching based on a non-uniformity of the electric field. Here We present recent development of the near-field etching on various materials and structures.
11:30 11:45 LIC2-2 Investigation on increase of ignition probability by using laser induced ignition with burst pulse in aerospace engine Yoshiki Matsuura1, Masahiro Sasaki1,Jun Izawa2, Mitsunori Itou2, Takahisa Nagao2
1IHI Aerospace Co., LTD., Japan
2IHI Co., LTD., Japan
IHI Aerospace has studied on the laser ignition device for Oxygen/Methane thruster with sub-nanosecond pulse laser which can produce 10 kHz order burst pulses. In this study, the ignition probability is going to be evaluating with multi-burst pulse mode.
11:45 12:00 LIC2-3 The aging properties of dichroic films used in laser ignition systems Duo Tang, Yong Li, Wenzhi Qin, Xiangbo Ji, Yuan Gao, Zhihao Wang, Liang Wang
Institute of Chemical Materials, CAEP, China
Two dichroic films were prepared to investigate their aging properties. Results indicate that the environmental viability of dichroic films can be significantly improved by carefully tailoring their micro-structure.
12:00 13:30 Lunch

LIC3: Advanced ignition systems and applications (3)
Chair: Takuma Endo(Hiroshima Univ., Japan)

Room 302

Start End Session No. Title Speaker Description
13:30 14:00 LIC3-1Invited Laser spark plug developments for engine ignition Geoffrey Dearden1, Nicolaie Pavel2, Mark Bärwinkel3, Peter Heinz3, Dieter Brüggemann3, Gabriela Croitoru2, Oana Valeria Grigore3
1University of Liverpool, School of Engineering, UK
2National Institute for Laser, Plasma and Radiation Physics, Laboratory of Solid-State Quantum Electronics, Romania
3University of Bayreuth, Department of Engineering Thermodynamics & Transport Processes, Germany
Progress in laser ignition research, targeting laser source or laser spark plugs with dimensions and properties suitable for engine operation is outlined. Paths taken to build laser spark plugs and test engine results are described.
14:00 14:15 LIC3-2 The influence of film structure on AL/PTFE multilayer laser ignition Xiujuan Sun, Qiubo Fu
Institute of Chemical Materials, CAEP, China
Al/PTFE multilayer films with different structures were prepared and single pulsed laser loading tests were conducted, results showed that the multilayered structure influences the reaction, and pulsed width have a dominate influence on the effects
14:15 14:30 LIC3-3 Laser ignitions for non-solvent ionic liquid propellant based on Ammonium dinitramide Noboru Itouyama1, Hiroto Habu2
1The University of Tokyo, Japan
2Japan Aerospace Exploration Agency (JAXA), Japan
This study was focused on the breakdown laser ignition for high performance and low toxicity ionic liquid propellant based on high energetic materials, and proposed the conceivable thruster system with this propellant.
14:30 14:45 LIC3-4 Direct initiation of detonation using laser ablation Kazuhiro Ishii, Sakiko Ishihara, Hidefumi Kataoka
Yokohama National Univesity, Japan
The critical energy of direct initiation of detonation induced by laser ablation, which is estimated from the energy conversion efficiency, is in good agreement with the previous experimental data.
14:45 15:00 LIC3-5 On the performances of a 4-cylinder automobile engine with classical spark plug and laser ignition systems Adrian Birtas1, Nicolae Boicea1, Florin Draghici2, Radu Chiriac3, Gabriela Croitoru4, Mihai Dinca4, 5, Nicolaie Pavel4
1Renault Technologie Roumanie, Romania
2University Politehnica of Bucharest, Faculty of Electronics, Telecommunications and Information Technology, Romania
3University Politehnica of Bucharest, Faculty of Mechanical Engineering, Romania
4National Institute for Laser, Plasma and Radiation Physics, Laboratory of Solid-State Quantum Electronics, Romania
5University of Bucharest, Faculty of Physics, Romania
A 4-cylinder automobile engine was ignited by classical spark plugs as well as by laser sparks. Engine efficiency parameters were registered at 2000-rpm speed and 2-bar BMEP for stoichiometric and lean mixtures up to lambda~1.25.
15:00 15:30 Break

LIC4: Advanced applications of laser (1)
Chair: Nicolaie Pavel(National Institute for Laser, Plasma and Radiation Physics – INFLPR, Rumania)

Room 302

Start End Session No. Title Speaker Description
15:30 16:00 LIC4-1Invited Short pulsed laser ablation of fluorides and thin film deposition for ultraviolet optoelectronics Shingo Ono1, Fumihiro Itoigawa1, Akira Yoshikawa2
1Nagoya Institute of Technology, Japan
2Tohoku University, Japan
Laser ablation using nanosecond or femtosecond laser pulses was applied for the fluoride thin films growth. We demonstrated the vacuum ultraviolet field emission lamps and photodetectors by employing such fluoride thin films.
16:00 16:30 LIC4-2Invited Effects of Laser Induced shock waves on droplets J. Yi, A. Renaud, L. Zimmer
CNRS, CentraleSupélec, Université Paris-Saclay, France
The interaction between laser induced shock-waves and droplets are investigated using Planar Imaging techniques for the shock-wave investigation and a 4D-Interferometrie Particle Imaging technique to measure position, size and velocities of droplets in the vicinity of the laser induced plasmas.
16:30 16:45 LIC4-3 Effects of high irradiation dose on a Nd:YAG/Cr:YAG microchip composite for remote laser-induced breakdown spectroscopy (LIBS) Koji Tamura1, 2, Hironori Ohba1, 2, Morihisa Saeki1, 2, Tomitsugu Taguchi1, Hwan Hong Lim3, Takunori Taira3, Ikuo Wakaida2
1The National Institutes for Quantum and Radiological Science and Technology, Japan
2Japan Atomic Energy Agency, Japan
3National Institutes of Natural Sciences, Japan
Effects of high irradiation dose on a Nd:YAG/Cr:YAG microchip composite and the giant-pulse microchip laser operation were investigated. Although emission from the composite was observed, laser operation was possible.
16:45 17:00 Opening Remarks (Continued)
April 27 Fri.

LIC5: Laser for ignition
Chair: Yuji Oki(Kyushu Univ., Japan)

Room 302

Start End Session No. Title Speaker Description
9:00 9:30 LIC5-1Invited The future prospects for transparent ceramics Tomohisa Takemasa, Katsuhiro Muramatsu, Hideki Yagi, Takagimi Yanagitani
Konoshima Chemical Co. Ltd., Japan
9:30 9:45 LIC5-2 First hohlraum-capsule integrated implosion experiments on the SGIII facility Fengjun Ge1, Shiyang Zou1, Yiqing Zhao1, Tingxuan Huang2, Yudong Pu2
1Institute of Applied Physics and Computational Mathematics, China
2Research Center of Laser Fusion, China Academy of Engineering Physics, China
The first hohlraum-capsule integrated implosion experiments were launched on the SGIII facility. We got the highest indirect drive implosion neutron yield in China. The main sources of performance degradation are analysed.
9:45 10:00 LIC5-3 Magnetooptical Q-switch laser using neodymium yttrium aluminum garnets Ryohei Morimoto1, Taichi Goto1, 2, John Pritchard3, Mani Mina3, Takunori Taira4, Yuichi Nakamura1, Pang Boey Lim1, Hironaga Uchida1, Mitsuteru Inoue1
1Toyohashi University of Technology, Japan
3Iowa State University, USA 4Institute for Molecular Science, Japan
A magnetooptical Q-switch laser with Nd:YAG crystal was demonstrated. The result indicated the magnetooptical Q-switch using a magnetic garnet film can be used with not only isotropic materials but also anisotropic lasing materials. We also grew magnetic garnet films onto single crystalline Nd:YAG substrates via pulsed laser deposition method for integration of magnetooptical Q-switches with microchip lasers.
10:00 10:15 LIC5-4 Ignition enhancement by dual-pulse laser-induced spark Lydia Wermer1, Seong-kyun Im1, Joseph K. Lefkowitz2, Timothy Ombrello2
1University of Notre Dame, USA
2Air Force Research Laboratory, USA
Ignition and flame propagation by single pulse and dual pulse laser induced spark was studied in a fuel lean premixed methane air flow to investigate regions of enhancement by dual pulse laser induced breakdown.
10:15 10:30 LIC5-5 High damage threshold semiconductor saturable absorber mirror for fiber lasers Yan Wang1, Nan Lin2, Wanli Gao1, Huanyu Song3, Minglie Hu3, Haiming Li4, Wenxia Bao4, Xiaoyu Ma2, Zhigang Zhang1
1Peking University, China
2Chinese Academy of Sciences, China
3Tianjin University, China
4LZ Lasers Inc., China
We demonstrate a high damage threshold semiconductor saturable absorbs mirror for mode-locked fiber lasers, with a damage threshold of 9.5mJ/cm2, a modulation depth of 11.5%, a saturation fluence of 39.3mJ/cm2, an ISA coefficient of 6.3’102mJ/cm2.
10:30 11:00 Break
11:00 11:30 LIC5-6Invited Lens/window-fouling mitigation in laser ignited reciprocating engines Sreenath Gupta1, Bader Almansour2, Qing Wang3
1Argonne National Laboratory, USA
2University of Centrakl Florida, USA
3Princeton optronics, Inc., USA
This paper presents results from a strategy that effectively reduces lens fouling, which makes it possible to use laser ignition in natural gas engines on a long-term basis.
11:30 11:45 LIC5-7 The study of tuning low-mode asymmetries for ignition capsule implosions Jianfa Gu, Zhensheng Dai, Shiyang Zou
Institute of Applied Physics and Computational Mathematics, China
Low-mode asymmetries have become the major sources of performance degradation in the NIF implosion experiments. We have studies some new tuning methods to improve the implosion symmetry and performance in the NIF ignition experiments.
11:45 12:00 LIC5-8 Optical fiber coupling of high-energy density pulsed lasers for laser ignition Wenzhi Qin, Yuan Gao, Duo Tang, Xiangbo Ji, Yong Li, Zhihao Wang, Liang Wang
Institute of Chemical Materials, CAEP, China
Two optical fibers with different surface roughness were obtained by grinding their incident faces using grinding papers. The coupling efficiency and damage threshold of the fibers were studied.
12:00 13:00 Lunch

LICp6: Poster Session

Exhibition Hall A

Start End Session No. Title Speaker Description
13:30 14:30 LICp6-1 A high-peak power passively Q-switched Nd:YAG/Cr4+:YAG compact laser with multiple-beam output Nicolaie Pavel, Oana Valeria Grigore, Gabriela Croitoru, Mihai Dinca
National Institute for Laser, Plasma and Radiation Physics – INFLPR, Romania
A diode-pumped, passively Q-switched, compact and monolithic Nd:YAG/Cr4+:YAG ceramic laser with four-beam output is presented. The energy of each laser pulse could be increased up to 5.9 mJ at pulse duration around 1 ns.
LICp6-2 Development of high-brightness high-energy micro-MOPA Vincent Yahia, Takunori Taira
Institute for Molecular Science, Japan
Ultra-compact MOPA for high-energy laser pulses is developed. Gain aperture is used for production of near-gaussian pulses, with brightness of 18 PW/sr/cm2. We propose the end-pumped DFC medium as an alternative to side-pumped rod-type amplifier.
LICp6-3 Study on laser threshold of CuO/Al nanowires composite Yao Wang1, Qiubo Fu1, Ruiqi Shen2
1Institute of chemical materials, CAEP, China
2Nanjing university of science and technology, China
In this paper, the CuO nanowires cores were served as templates for the deposition of Al shells by subsequent magnetron sputtering to get the CuO/Al. The thershold laser igniton energy was performed of CuO/Al nanowires
LICp6-4 Laser ignition in compact engines: two-stroke and Wankel Egor Y. Loktionov, Nikita A. Pasechnikov, Victor D. Telekh
Bauman Moscow State Technical University, Russia
We have investigated possible benefits of laser ignition in two-stroke and Wankel 1 hp scale model engines using different kinds of fuel mixtures: hydrogen, methane, propane, butane, gasoline and ethanol based.
LICp6-5 Effect of discharge lengths on combustion characteristics in laser breakdown-assisted long-distance discharge ignition Shun Sakamoto1, Takaki Ikemoto1, Kazuya Iwata1, Osamu Imamura1, Yasunori Ohkuma1, Hiroshi Yamasaki1, Kazuhiro Akihama1, Hirohide Furutani2, Eiichi Takahashi3
1Graduate School of Industrial Technology, Nihon University, Japan
2Renewable Energy Research Center, AIST, Japan
3Research Institute for Energy Conservation, AIST, Japan
Pressure histories of LBALDI with various electrode gaps were acquired for methane/air mixture in a vessel with constant volume. Faster combustion was observed for a longer electrode distance in the lean mixture.
LICp6-6 Ultrafast shock evolution phenomena generated by laser ablation of Al-based metal films Yuan Gao, Wenzhi Qin, Zhihao Wang, Xiangbo Ji, Duo Tang, Yong Li, Liang Wang
Institute of Chemical Materials, CAEP, China
We investigate the ultrafast phenomena of Nd:YAG laser ablation of Al films with and without Ti layer by a time-resolved nanosecond-shadowgraph technique.
LICp6-7 Q-switched laser oscillation in polycrystalline Yb:FAP anisotropic laser ceramics Yoichi Sato, Jun Akiyama, Takunori Taira
Institute for Molecular Science, Japan
Using polycrystalline Yb3+-doped fluoroapatite (Yb:FAP), we investigated the process control with quantum mechanics for anisotropic laser ceramics. Kilowatt-level sub-ns laser pulses were generated from orientation-controlled microdomains with the extraction density of 0.34 J/cm3.
LICp6-8 Theoretical study on the mechanism of sub-ns giant-pulse laser induced air-breakdown due to cascade ionization Hwan Hong Lim, Takunori Taira
Institute for Molecular Science, Japan
We proposed a rate equation of free electron density induced by laser due to cascade ionization. The simulation results were used to analyze the pulse-width scaling law of air-breakdown threshold intensity for laser ignition application.
LICp6-9 Optimization of CW operation in distributed face cooling Arvydas Kausas, Lihe Zheng , Takunori Taira
Institute for Molecular Science, Japan
A Distributed Face Cooling chip which consist or periodic Sapphire and Nd3+:YAG crystals is introduced. The chip is made of 11 crystals by surface activated bonding technology at room temperature. CW operation was compared to conventional Nd3+:YAG rod laser with same gain length. Twice the output power was obtained in DFC chip.
LICp6-10 Single-crystal intermediate laser coating (SILC) for high-field polycrystalline ceramics laser Lihe Zheng, Takunori Taira
Institute for Molecular Science, Japan
LiDT fluence of new coating solution named single-crystal intermediate laser coating (SILC) on single crystal got one order higher enhancement compared with that on polycrystalline ceramics, opening new research field for high-field polycrystalline ceramics laser.
LICp6-11 Development of Cr:YAG/Nd:YAG ceramics pulse laser chip Y. Yamazaki1, M. Mikami1, M. Goto2, H. Tanaka2
1JX Nippon Mining & Metals Corporation Isohara Works, Japan
2JXTG Nippon Oil & Energy Corporation High Performance Materials Company, Japan
Ceramics laser medium was promising for a light source of new applications. We developed a transparent YAG ceramics. And mm3-size Cr:YAG/Nd:YAG composite were fabricated. A composite with mirror at both sides was excited by 808 nm Laser-Diode and Q-switched laser oscillation was confirmed.
LICp6-12 Analysis of the amplifier for PW/sr/cm2 class Micro-MOPA Taisuke Kawasaki, Vincent Yahia, Takunori Taira
Institute for Molecular Science, JAPAN
Thermal lens problem of PW/sr/cm2-class Micro-MOPA was discussed. In order to realize 100 Hz operation, we evaluated thermal lens effect in highly excited Nd:YAG-rod of 200mJ Micro-MOPA.

LIC7: Advanced applications of laser (2)
Chair: Takunori Taira(IMS, Japan)

Room 302

Start End Session No. Title Speaker Description
14:30 15:00 LIC7-1Invited Ignition characteristics of laser breakdown and electrical sparks in lean quiescent and turbulent mixtures Shinji Nakaya, Mitsuhiro Tsue
The University of Tokyo, Japan
Laser breakdown and electrical spark ignition processes were investigated experimentally in lean quiescent and turbulent mixtures for methane/air and propane/air mixtures using a constant volume chamber.
15:00 15:30 Break
15:30 15:45 LIC7-2 Investigation on the influence of optical windows on laser ignition thresholds Yong Li, Duo Tang, Xiangbo Ji, Wenzhi Qin, Yuan Gao, Zhihao Wang, Liang Wang
Institute of Chemical Materials, CAEP, China
Simulations and experiments were conducted to study influences of optical windows on pyrotechnics during laser ignition. Results indicated that K9 glass was the best choice for laser igniter to realize reliable firing of pyrotechnics and sealing of igniter.
15:45 16:00 LIC7-3 LIBS system for trace impurity detection in semiconductor manufacturing process Rakesh Bhandari1, Naoya Ishigaki1, Jiro Saikawa1, Koji Tojo1, Yoshitada Ito1, Takashi Ono1, Takunori Taira2
1Shimadzu Corporation, Japan
2Institute for Molecular Science, Japan
We report, for the first time, a double-pulse LIBS system that can quantitatively detect trace metal impurities in a semiconductor manufacturing process. It optimizes process quality while reducing costs and adverse effects on the environment.
16:00 16:15   Closing Remarks