Pacific Rim Laser Damage 2018(PLD2018)


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.

PLD3: High Power Laser Damage I
Chair: Takahisa Jitsuno(Osaka University, Japan)

Room 212

Start End Session No. Title Speaker Description
9:00 9:30 PLD3-1Plenary Toward “defect-free” optics: a pioneering comprehensive metrology method Jianda Shao1, J. Chen2, S. Liu1, M. Zhu1, L. Ma2, W. Li2, M. Huang2
1Shanghai Institute of Optics and Fine Mechanics, China,
2ZC Optoelectronic Technologies Ltd., China
The laser based inertial confinement fusion (ICF) research devices, typically represented by the National Ignition Facility (NIF) are striving to seek a new energy source for human-being. However, until now ICF systems worldwide still face several obstacles.
9:30 9:45 PLD3-2 Study of absorption and defects properties for large aperture high-power laser optics at multiple wavelengths Jian Chen1, 2, Z. Wu1, 2, L. Ma1, 2, X. Wang1, 2, H. Zhou1, 2, W. Xu1, 2
1Anhui Province Key Laboratory of Non-Destructive Evaluation, China,
2ZC Optoelectronic Technologies Ltd, China
Many precise laser systems set strict requirements on the optics, such as low absorption, high laser damage threshold, and low defect density.
9:45 10:00 PLD3-3 Comparation of 355-nm nanosecond and 1064-nm picosecond laser-induced damage in high-reflective coatings Yuan’an Zhao, C. Li, Y. Zhao, Y. Cui, X. Peng, C. Shan, M. Zhu, J. Wang, J. Shao
Shanghai Institute of Optics and Fine Mechanics, China
Laser-induced damage in optical components has always been a key challenge in the development of high-power laser systems. In picosecond regime, the laser-matter interactions are quite complex and the damage mechanism is not yet understood.
10:00 10:15 PLD3-4 351nm mirrors with modified outer stack and post-treatment methods to increase the laser damage resistance Feng Pan, F. Pan, Z. Liu, Q. Wu
Chengdu Fine Optical Engineering Research Ctr., China
The 351nm mirrors with different outer stacks were prepared by electron beam evaporation. The damage morphology and damage mechanism of different mirrors were analyzed.
10:15 10:45 Break

PLD:4 High Power Laser Damage II
Chair: Shinji Motokoshi(Inst. for Laser Technology, Japan)

Room 212

Start End Session No. Title Speaker Description
10:45 11:15 PLD4-1Invited Investigation on the multilayer coating with co-evaporated interface Meiping Zhu, N. Xu, Y. Chai, J. Sun, K. Yi, J. Wang, Y. Zhao, J. Shao
Shanghai Institute of Optics and Fine Mechanics, China
Multilayer coatings fabricated by e-beam evaporation are widely used in high power laser system. Much work has been done to investigate the laser induced damage mechanism.
11:15 11:30 PLD4-2 Effect of micro-crack and reaction product on laser damage performance of optical glass during chemical etching Huapan Xiao, Z. Chen, H. Wang, J. Wang, N. Yu
Xi’an Jiaotong Univ, China
Chemical etching is usually utilized to improve the laser damage performance of optical glass by mitigating micro- cracks, while it inevitably produces some reaction products (RPs).
11:30 11:45 PLD4-3 Strategies for improving the laser-induced damage thresholds of dichroic coatings developed for high-transmission at 527nm and high reflection at 1054nm Ella S. Field, D. Kletecka
Sandia National Labs., USA
We report on progress for increasing the laser-induced damage threshold of dichroic beam combiner coatings for high transmission at 527 nm and high reflection at 1054 nm (22.50 angle of incidence, S-polarization).
11:45 12:00 PLD4-4 Investigation on water vapor transport of e-beam coatings by employing a PIAD capping layer Tingting Zeng1, 2, M. Zhu1, Y. Chai,1, C. Yin1, 2, N. Xu1, 2, J. Shao1
1Shanghai Institute of Optics and Fine Mechanics, China,
2Univ. of Chinese Academy of Sciences, China
The large aperture multilayer coatings by electronic beam deposition are widely used in high power laser systems, e.g. National Ignition Facility, ShenGuang series big laser Facilities, and so on, because of high laser-resistance, surface uniformity, as well as good optical performance.
12:00 13:00 Lunch

PLD5: Defects and DUV
Chair: Meipin Zhu(Shanghai Inst. of Optics and Fine Mechanics, China)

Room 212

Start End Session No. Title Speaker Description
13:00 13:30 PLD5-1Invited UV laser-induced degradation of nonlinear optical borate crystals Masashi Yoshimura1, 2, R. Murai1, Y. Takahashi1, Y. Mori1, 2
1Osaka University, Japan,
2SOSHO CHOKO Inc., Japan
There is an increasing demand for deep ultraviolet (UV) sources in industrial fields such as high-resolution inspection and advanced material processing. CsLiB6O10(CLBO) is one of nonlinear optical crystal suitable for generating DUV output with wavelength below 300 nm [1].
13:30 13:45 PLD5-2 Study of laser-induced damage and defect by multiple pulses irradiation for silica glasses Shinji Motokoshi1, 3, Y. Takemura2, H. Ogawa2, M. Yoshida2, K. Fujioka3, T. Jitsuno3, M. Yoshimura3
1Institute for Laser Technology, Japan,
2Kindai university, Japan,
3Osaka Univ., Japan
The Laser-induced damage threshold (LIDT) of optics decreases with increase irradiation laser pulse number and pulse frequency.
13:45 14:00 PLD5-3 Laser damage measurement of commercially available UV fused silica at 193nm Xingliang Song, P. Sha, J. Rui, G. Liu, B. Liu, J. Zhao, Y. Zhou, J. Yang, G. Xiong, Y. Wang
Academy of Opto-Electronics, CAS, China
Fused silica is considered as a more flexible material in the UV spectrum. To get the actual performance of fused silica made optical window, it is necessary to study its LIDT.
14:00 14:15 PLD5-4 Transmissivity testing of calcium fluoride windows under high pulse repetition rate laser radiation at 193nm Xingliang Song1, 2, Y. Fan1, P. Sha,1, H. Zong1, 2, H. Li1, J. Zhao1, Y. Zhou1, J. Yang1, G. Xiong1, Y. Wang1
1Academy of Opto-Electronics, CAS, China,
2Univ. of Chinese Academy of Sciences, China
Calcium fluoride(CaF2) is the most recognized optical material for laser optics under 200nm. CaF2 laser windows are categorized into different grades according to material purity level.
14:15 14:30 PLD5-5 Influence of bulk defects on bulk damage performance of fused silica optics at 355-nm pulse laser Jin Huang
China Academy of Engineering Physics, China
We demonstrate the effects of typical bulk defects of fused silica on bulk damage threshold under nanosecond UV pulse laser. A new test method is built to evaluate laser induced bulk damage performance more reasonably.
14:30 14:45 PLD5-6 Interstitial O2 and Si-H stretching bond defects absorption produced in fused silica during laser-induced damage Chunyan Yan, B. Liu, X. Ju
Univ. of Science and Technology Beijing, China
Fused silica irradiated with 6.8-ns 355-nm laser pulses is studied by micro-Raman scattering spectroscopy.
14:45 15:00 PLD5-7 Absorption enhancement by laser-induced defects in fused silica Takahisa Jitsuno1, S. Motokoshi2, M. Yoshimura1
1Osaka Univ, Japan,
2Institute for Laser Technology, Japan
Absorption enhancement phenomena by laser-induced defects have been investigated experimentally in fused silica with 157 nm F2 laser pulse.
15:00 15:30 Break

PLD6: Laser Materials
Chair: Takahisa Jitsuno(Osaka Univ., Japan)

Room 212

Start End Session No. Title Speaker Description
15:30 16:00 PLD6-1Invited Highly-efficient Ho:KY(WO4)2 thin-disk lasers at 2.06 μm Valentin P. Petrov1, X. Mateos1, 2, 3, P. Loiko4, S. Lamrini2, K. Scholle2, P. Fuhrberg2, S. Suomalainen5, A. Härkönen5, M. Guina5, S. Vatnik6, I. Vedin6, M. Aguiló3, F. Díaz3, Y. Wang1, U. Griebner1
1Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Germany,
2Univ. Rovira i Virgili, Spain,
3LISA Laser Products OHG, Germany,
4ITMO Univ., Russia,
5Tampere Univ. of Technology, Finland,
6Institute of Laser Physics, Russia
We report on the first Holmium (Ho3+) monoclinic double tungstate thin-disk laser. It is based on a 250 μm-thick 3 at. % Ho:KY(WO4)2 active layer grown on a (010)-oriented KY(WO4)2 substrate.
16:00 16:30 PLD6-2Invited Functional crystal films fabricated by pulsed laser deposition Jacob I. Mackenzie, S. V. Kurilchik, J. A. Grant-Jacob, J. J. Prentice, R. W. Eason
Univ of Southampton, UK
Crystalline films grown by epitaxial deposition techniques are typically limited by growth rates to being relatively thin (~<1 micron).
16:30 16:45 PLD6-3 Third-order-nonlinear effects in ceramics Efim A. Khazanov, V. Ginzburg, A. Kochetkov
Institute of Applied Physics of the Russian Academy of Sciences, Russia
The orientation of crystallographic axes in each ceramics grain is random. The nature of ceramics manifests itself in the presence of the effects dependent on crystal orientation.
16:45 17:00 PLD6-4 Visible waveguide lasers based on femtosecond laser inscribed cladding waveguides in Pr:YLF crystal Hongliang Liu1, M. Hong2, F. Chen3
1Nankai Univ., China,
2National Univ. of Singapore, Singapore,
3Shandong Univ, China
Channel waveguide in Pr:YLF crystal is fabricated by emtosecond laser (fs-laser) micromachining system. The micro Raman (μ-Raman) spectra and scanning confocal fluorescence imaging investigations of the depressed cladding structure indicated that slight changes (with respect to widths of the emission lines and spectral positions) have been generated in the laser-modification region.
17:00 17:15 PLD6-5 Design and fabrication of multiplexed volume Bragg gratings as angle amplifiers in high-power beam scanning system Peng Chen, Y. Jin, H. He, J. Chen, J. Zhao, J. Xu, Y. Zhang, F. Kong
Shanghai institute of optics and fine mechanics, China
Volume Bragg Grating (VBG) recorded in photo-thermo-refractive (PTR) glass has advantages of high diffraction efficiency, excellent wavelength selectivity and angle selectivity, high angle magnification and flexible design, and high power tolerance, making it good candidate for angle amplifier in high power beam scanning system.
April 27 Fri.

PLD7: Etching and Non-linear crystals
Chair: Tomosumi Kamimura(Osaka Insti. of Techn., Japan)

Room 212

Start End Session No. Title Speaker Description
9:00 9:15 PLD7-1 Three-dimensional profile of laser-induced surface damage pit of fused silica and its evolution during wet chemical etching Taixiang Liu
China Academy of Engineering Physics, China
Large-scale high power/energy laser facility is a basis for the research of inertial confinement fusion. In the facility, fused silica plays an irreplaceable role but simultaneously vulnerable during the routine operation of the facility.
9:15 9:30 PLD7-2 Combination of reaction ion etching and dynamic chemical etching for improving laser damage resistance of fused silica optical surfaces Laixi Sun, J. Huang, H. Liu, X. Ye, J. Wu, X. Jiang, L. Yang, W. Zheng, W. Wu
China Academy of Engineering Physics, China
An effective combined process of reaction ion etching (RIE) and dynamic chemical etching (DCE) is applied for significantly improving the damage resistance of fused silica optics while minimizing the removal amount.
9:30 9:45 PLD7-3 Inhomogeneity of material removing and its influence on surface morphology of fused silica during HF etching Yuan Li1, K. Yang2, C. Yao2, H. Yan2, X. Yuan2, L. Yang2, X. Ju2
1Univ. of Science and Technology Beijing, China,
2Laser Fusion Research Ctr., China Academy of Engineering Physics, China
The laser induced damage threshold of fused silica optics can be improved by etching in hydrofluoric (HF) acid, due to the removing of the redeposited layer and subsurface defects. While the surface morphology of the fused silica may deteriorate.
9:45 10:00 PLD7-4 High laser damage threshold of fused silica by HF etching with multifrequency ultrasonic Xin ye, H. liu, F. Wang, J. Huang, X. Jiang, W. Zheng
Research center of laser fusion,CAEP, China
The laser damage precursors in subsurface of fused silica (e.g. photosensitive impurities, scratches and redeposited silica compounds) were mitigated by mineral acid leaching and HF etching with multifrequency ultrasonic agitation, respectively.
10:00 10:15 PLD7-5 Surface damage of KDP crystal induced by subsurface and bulk defects under exposure to nanosecond 3ω laser Feng Geng1, J. Huang2, F. Wang2, H. Liu2, X. Jiang2
1Chengdu Fine Optical Engineering Research Center, China,
2Research Center of Laser Fusion, China
We presented laser-induced surface damage properties of a series of KDP crystals produced by different vendors. In situ microscopy system for bright-field, scattering, fluorescence imaging was integrated in our small-aperture damage test facility, which was further used to investigate defect-damage correlation in laser damage experiments.
10:15 10:30 PLD7-6 Transient dynamics damage process and multi-physics field simulation of KDP crystal under 355-nm nanosecond laser Zhichao Liu1, H. Yang2, F. Geng1, Y. Zheng3, J. Cheng2, M. Chen2, J. Wang1, Q. Xu1
1Chengdu Fine Optical Engineering Research Ctr, China,
2Harbin Institute of Technology, China,
3Novaphoton Co.,Lt, China
TRPP (Time Resolved Pump-Probe) is a versatile tool in ultrafast physics field, it can be employed to study the damage process in KDP crystal and reveal the transient phenomenon, such as energy absorption, plasma formation, shockwave propagation, etc.

PLD8: Poster Session

Exhibition Hall A

Start End Session No. Title Speaker Description
10:30 12:00 PLD8p-1 A real-time laser conditioning technique coupled with photothermal lens probe on 1064-nm mirror Yi Zheng1, Z. Liu2, P. Ma2, F. Pan2, F. Geng2, J. Wang2, Q. Xu2
1Chengdu Novaphoton Co. Ltd., China,
2Chengdu Fine Optical Engineering Research Ctr, China
We have presented a novel adaptive laser conditioning (ALC) concept on 1064nm mirror that uses photo-thermal lens probe (PTLP) to detect defects in-situ and then carries out adaptive control of exposure fluence.
PLD8p-2 Study on the properties of thin films used in laser system Cui Yun1, Fei Liang2, Yuan\’an Zhao1, Meiping Zhu1, Kui Yi1, Jianda Shao1
1Shanghai Institute of Optics and Fine Mechanics, China,
2Shanghai Univ., China
Hafnia-silica (HfO2-SiO2) mixed coatings with a wide range of compositions were deposited on fused silica substrates by electron beam co-evaporation.
PLD8p-3 High-efficiency and low-damage lapping process optimization based on effective damage removal rate Ci Song, Y. Lin, H. Hu, S. Chen, L. Zhou, G. Tie
National Univ. of Defense Technology, China
The low-damage optics are applied widely in modern laser system, and its fabrication is always the popular issue. As one of the key points in the manufacturing process, the optimization of efficiency and damage challenges the lapping process.
PLD8p-4 Research on a new combined polishing technology and damage threshold improvement of KDP crystals Hao Hu, G. Tie, C. Song, L. Zhou, S. Chen
National Univ. of Defense Technology, China
Potassium Dihydrogen Phosphate(KDP) crystal is an excellent nonlinear optical material and is also the unique material used for high energy laser system.
PLD8p-5 Characterization of multiwavelength laser-induced damage in DKDP crystals Jinming Wu1, 2, Y. Zhao2, L. Wang1, X. Peng2, L. Yang2
1Shanghai Univ., China,
2Shanghai Institute of Optics and Fine Mechanics, China
Nanosecond laser-induced damage (LID) in potassium dihydrogen phosphate (KH2PO4) remains an issue for light- frequency converters in large-scale lasers system such as NIF (National Ignition Facility, in USA) and LMJ (Laser MegaJoule, in France).
PLD8p-6 Nonlinear optical characteristics of ADP crystals Yafei Lian, X. Sun, M. Xu, L. Zhang
Shandong Univ., China
A picosecond Nd:YAG laser (30 ps, 10-Hz pulse repetition rate) was used in the experiments. Nonlinear optical characteristics of crystals were investigated at λ= 532nm, 355nm and 266nm.
PLD8p-7 Third-harmonic-generation nonlinear absorption coefficient of 70% deuterated DKDP crystal Dongting Cai1, X. Ju2, B. Liu2
1Shandong Univ., China,
2Univ. of Science and Technology Beijing, China
The nonlinear optical absorption (NLA) of 70% deuterated DKDP crystals that were cut along different directions and annealed under different temperatures were measured at the third-harmonic-generation (THG) wavelength (355 nm) of a nanosecond Nd:YAG laser (pulse duration of 5.4 ns and repetition rate of 10 Hz) by using the Z-scan method.
PLD8p-8 Wide-bandgap nonlinear crystal with high damage resistance for femtosecond mid-infrared spectrometer using chirped-pulse upconversion Yusuke Funamoto1, Y. Inagaki1, 2, H. Hata1, 2, T. Kamimura1, N. Umemura3, N. Hamada2, R. Nakamura2
1Osaka institute of technology, Japan,
2Osaka University, Japan,
3Chitose Institute of Science and Technology, Japan
For biochemical processes such as photoisomerization, bond formation and dissociation, and protein folding, femtosecond time-resolved mid-infrared (MIR) spectroscopy has been a powerful tool for gaining insight.
PLD8p-9 XANES investigation on surface electronic structure of KDP crystals irradiated with different fluences and retired components Xiangcao Li, X. Ju, B. Liu
Univ. of Science and Technology Beijing, China
The electronic structure of phosphorus is essential for understand the laser-induced damage since P atom is the body-centered atom and it is fundamental to the structure of KDP crystal.
PLD8p-10 Crystal growth and UV laser-induced damage resistance of a strontium tetraborate Yasunori Tanaka1, K. Shikata1, Y. Takahashi1, R. Murai1, M. Imanishi1, Y. Mori1, 2, M. Yoshimura1, 2
1Osaka University, Japan,
2SOSHO CHOKO Inc., Japan
One of borate materials, strontium tetraborate SrB4O7 (SBO), was reported as a nonlinear optical crystal with high nonlinear coefficients and wide transparency range [1].
PLD8p-11 Research of diamond transmission gratings used for high-power laser pulse compression Shuwei Fan, T. Zhu, H. Wang
Xi’an Jiaotong Univ., China
As a milestone in the development of laser technique, chirp pulse amplification (CPA) technique is widely applied to produce ultrahigh power laser.
PLD8p-12 Carrier dynamics in dispersion compensation element induced by femtosecond laser Xin Xing1, W. Yuan1, T. Kobayashi2, B. Xue2, J. Du1, Y. Leng1, Y. Zhao1, J. Shao1
1Shanghai Institute of Optics and Fine Mechanics, China,
2University of Electro-Communications, Japan
With the wildely application of high power femtosecond laser, optical thin film components are being one of the most critical components in the laser system.
PLD8p-13 Non-invasive and in situ measurement of a refractive index gradient profile of one-dimensional GRIN materials Humbat Nasibov
Refractive index (RI) distribution plays a crucial role in the propagation of light trough any transparent medium except a vacuum.
PLD8p-14 Q-switched composite gold nanorod and Nd:YAG ceramic planar waveguide laser Wenda Cui, K. Han, C. Zhang, G. Lin, J. Li, W. Hua, H. Wang, Y. Pan, X. Xu
National Univ. of Defense Technology, China
The planar waveguide laser is a crucial device for high power solid state lasers and integrated optics. The RE-doped ceramics has been widely investigated because of its flexibility and easier manufacture of large homogeneous gain volume.
PLD8p-15 Experimental study on the processing effect of DUV laser radiation to CFRP Xingliang Song1, 2, P. Sha1, H. Shi3, 4, B. Liu1, 2
1Academy of Opto-Electronics, CAS, China,
2Univ. of Chinese Academy of Sciences, China,
3Beijing Engineering Technological Research Ctr. for High-Efficient and Green CNC Machining Process, China,
4Beihang Univ., China
Carbon Fiber Reinforced Polymer(CFRP) is widely used in the industries of aerospace, automobile and sport. Due to its complex material component and structure, it is hard to assemble CFRP parts to others without damage.
PLD8p-16 Dynamical behavior of laser-produced copper plasma in uniform external magnetic field Narayan Behera, R. K. Singh, A. Kumar
Institute for Plasma Research, HBNI, Gandhinagar, India
An Nd:YAG laser (λ =1064 nm, 8 ns pulse width) of 150 mJ pulse energy is used to ablate copper target in the presence of 0 – 0.50 T transverse magnetic field.
PLD8p-17 The post-processing process and mechanism of coating based on laser shock wave Wenwen Liu, H. Yang, J. Zhang, D. Zhu
Wenzhou Univ., China
High power laser coatings are facing a series of more serious challenges including running on higher laser induced damage threshold (LIDT), higher repetitive frequency and higher stability.
PLD8p-18 Photostability study of CdTe quantum dots using laser induced fluorescence Author Preference Ahmed El-Hussein Mohamed Kamel ElNewishy, S. Elfeky
National Institute of Laser Enhanced Sciences, Egypt
Semiconductor quantum dots (QDs) having high quantum yields and unique photostability. This research studies the optical properties of the synthesized CdTe QDs with two different sizes using Laser induced fluorescence for investigating their photostability.
PLD8p-19 Laser decoating of TiN from TiN-coated 316L stainless steel substrates: Effects of laser parameters on the decoating Jingxuan Wang, Y. Ye
China Academy of Engineering Physics, China
Current environmental challenges require sustainable and extended use and re-use of materials. For example, the service life of engineering tooling can be extended by using thin film coatings such as titanium nitride (TiN).
PLD8p-20 Laser-induced damage of indium tin oxide films and polyimide films at 1064nm Liping Peng1, 2, X. Liu1, 2, Y. Zhao1, Y. Liu3, 2, Z. Cao3, 2, M. Zhu1, 2, J. Shao1, 2
1Shanghai Institute of Optics and Fine Mechanics, China,
2Univ. of Chinese Academy of Sciences, China,
3Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, China
Laser damage performance of indium tin oxide (ITO) films and polyimide (PI) thin films were investigated. The ITO films with 25nm thickness were deposited on glass substrates by magnetic sputtering, and then PI film samples with thickness of 80nm were spin coated on the ITO.
PLD8p-21 Study on the micro-etched morphology and electromagnetic properties of grain-oriented silicon steel by laser processing Zhang Jian
WenZhou University, China
In order to effectively reduce the iron loss of grain-oriented silicon steel. In order to optimize the electromagnetic properties of grain-oriented silicon steel. 
PLD8p-22 Thermo-mechanical behavior of photovoltaic cell under laser irradiation Chen-Wu Wu
Institute of Mechanics, China
The multiple physical responses of photovoltaic cell to laser irradiation are of fundamental meaning for developing laser power beaming technology as well as evaluating reliability of the solar panel subjected to unexpected laser exposure.
PLD8p-23 Mechanism of laser resist removal phenomenon without causing laser damage Yuji Umeda1, K. Nuno1, T. Yamashiro1, Y. Hunamoto1, A. Nishiura1, D. Sima1, H. Tsukamoto1, N. Nishioka1, H. Kuramae2, T. Nishiyama3, H. Horibe3, R. Nakamura4, T. Kamikura1
1Osaka Institute of Technology, Japan,
2Department of Robotics, Osaka Institute of Technology, Japan,
3Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Japan,
4Science & Technology Entrepreneurship Laboratory, Osaka University, Japan
Resist removal using the laser irradiation has attracted a great deal of attention as one of the new removal technologies. Usually, when a laser beam is irradiated to the resist in the normal atmosphere, laser damage occurs to the Si wafer surface.
12:00 13:00 Lunch

PLD9: Short-pulse Laser
Chair: Shinji Motokoshi(Inst. for Laser Technology, Japan)

Room 212

Start End Session No. Title Speaker Description
13:00 13:30 PLD9-1Invited Laser damage metrology in the sub-ps range for the PETAL facility Laurent Lamaignère
Commissariat à l’Énergie Atomique, France
13:30 14:00 PLD9-2Invited Progress at the high-power laser system of ELI-NP facility Daniel Ursescu
IFIN-HH / ELI-NP, Romania
High Power Laser System (HPLS) of ELI-NP facility aims to deliver 10PW class pulses (200J, 20fs, at 800nm) on two parallel arms, at a repetition rate of one shot per minute.
14:00 14:30 PLD9-3Invited Generation of few-cycle millijoule pulses at 5 um employing a ZnGeP2-based OPOCA Uwe Griebner
Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Germany
A mid-infrared optical parametric chirped pulse amplification (OPCPA) system generating few-cycle pulses with multi-GW peak power at a 1 kHz repetition rate is presented. The system is pumped by a high-energy 2-µm picosecond source to exploit the high nonlinearity of ZnGeP2 (ZGP) crystals for parametric amplification.
14:45 15:00 PLD9-5 Ultra-short pulse induced nonlinear reflection and its applications in laser processing of dielectrics Mingying Sun, Y. Guo, J. Zhu
Shanghai Institute of Optics and Fine Mechanics, China
We investigate the characteristics of transient reflectivity in ultrafast laser ablation of dielectrics with the Fresnel-Drude model.
15:00 15:15 PLD9-6 Combination properties of fluorinated ethylene propylene (FEP) film which may be used as the short pulse laser debris shields Shufan Chen
China Academy of Engineering Physics, China
Debris mitigation is a major challenge for all high-peak-power lasers system; the impulsive debris will pollute and damage the optical element and diagnostic facility.
15:15 15:45 Break

PLD10: Damage Measurement and Defects
Chair: Takahisa Jitsuno(Osaka University, Japan)

Room 212

Start End Session No. Title Speaker Description
15:45 16:00 PLD10-1 Optical modified lateral shearing interferometer for on-line damage morphology measurement Jie Li, R. Ba, X. Zhou, Y. Zheng, L. Ding, B. Chen, J. Yuan
China Academy of Engineering Physics, China
Laser-induced damage resistence of optical components is one of the critical factor in high power laser systems.
16:00 16:15 PLD10-2 The distribution, specifies, and absorption of precursors responsible for bulk damage initiation in doubler KDP crystals at different wavelengths Yinbo Zheng, R. Ba, J. Li, X. Zhou, L. Ding, J. Yuan, H. Xu, J. Na, Y. Li, B. Chen
China Academy of Engineering Physics, China
This work presents the characteristics of precursors responsible for bulk damage initiation in type I doubler KDP crystals under different exposure wavelengths and fluences combinations.
16:15 16:30 PLD10-3 Shape dependence of downstream light intensification caused by flaws Zhaoyang Jiao, M. Sun, L. Ren, Y. Guo, R. Wu, Y. Zhang, J. Zhu
Shanghai Institute of Optics and Fine Mechanics, China
In high power laser system, the upstream flaw could induce light intensification in the downstream, thus damaging the optical component.
16:30 16:45 PLD10-4 Mixture modulation to incident laser by surface defect and contaminant on fused silica H. Wang, Z. Chen, Huapan Xiao, J. Wang, N. Yu
Xi’an Jiaotong Univ., China
It is inevitable that surface defect and contaminations would be generated during the grinding and polishing processes of optical components.
16:45 17:00 Closing remarks