Europe Optics + Optoelectronics最新文献_第4页

Optical nanofiber facilitated nonlinear optics effects in cold atoms 光学纳米纤维促进了冷原子中的非线性光学效应

Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2182341

V. Gokhroo, Ravi Kumar, S. Nic Chormaic

引用次数: 0

Alternative technologies and arrangements for future space x-ray telescopes 未来空间x射线望远镜的替代技术和安排

Europe Optics + Optoelectronics Pub Date : 2015-05-15 DOI: 10.1117/12.2177699

R. Hudec, L. Pína, A. Inneman

引用次数: 1

Applications of lobster eye optics 龙虾眼光学的应用

Europe Optics + Optoelectronics Pub Date : 2015-05-15 DOI: 10.1117/12.2177792

R. Hudec, L. Pína, A. Inneman, V. Tichý

引用次数: 12

Emittance control of electron and positron beams in laser plasma accelerators 激光等离子体加速器中电子束和正电子束的发射度控制

Europe Optics + Optoelectronics Pub Date : 2015-05-14 DOI: 10.1117/12.2178882

L.-L. Yu, C. Schroeder, E. Esarey, C. Benedetti, J. Vay, M. Chen, Z. Sheng

引用次数: 1

Thermal distortion real-time detection and correction of a high-power laser beam-splitter mirror based on double Shack-Hartmann wavefront sensors 基于双Shack-Hartmann波前传感器的高功率激光分束镜热畸变实时检测与校正

Europe Optics + Optoelectronics Pub Date : 2015-05-14 DOI: 10.1117/12.2176741

Yu Ning, Quan Sun, Hongyan Wang, Wu-ming Wu, Shaojun Du, Xiaojun Xu

{"title":"Thermal distortion real-time detection and correction of a high-power laser beam-splitter mirror based on double Shack-Hartmann wavefront sensors","authors":"Yu Ning, Quan Sun, Hongyan Wang, Wu-ming Wu, Shaojun Du, Xiaojun Xu","doi":"10.1117/12.2176741","DOIUrl":"https://doi.org/10.1117/12.2176741","url":null,"abstract":"In a high-power laser system, a beam splitter refers to the mirror which locates at the cross point of the path of highpower beam and the weak light section. Because of the thermo-optic effect and elasto-optic effect, a beam splitter deforms under intense laser radiation. This deformation adds extra phase on the incident waves and deliveries inaccurate information to the wavefront sensor. Consequently, the output laser focuses at finite distance and gets divergent when arrives at the target. To settle the above problem, this paper presents a new method for real-time correction of the thermal distortion of beam splitter, based on algorithm of the data fusion of two Shack-Hartmann wavefront sensors (SH-WFS). Different from the traditional AO system, which contains a wavefront sensor, a corrector and a servo controller, two extra Shack-Hartmann wavefront detectors are adopted in our AO system, to detect the transmitted and reflected aberrations of beam splitter mirror. And these aberrations are real-timely delivered to the wavefront sensor. Based on coordinate conversion and data fusion algorithm, it makes the wavefront sensor of AO can “see” the aberrations of splitter mirror by itself. Thus, the servo system controls the corrector to compensate these aberrations correctly. In this paper, the theoretical model of data fusion algorithm is carried out. A closed-loop AO system, which consists of a typical AO system and two extra Shack-Hartmann wavefront detectors, is set up to validate the data fusion algorithm. Experimental results show that, the distortion of a CaF2 beam splitter can be real-time corrected when the AO closedloop control is on. The beam quality factor of output laser decreases from 4 to 1.7 times of diffraction limit.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"225 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121155177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Solid hydrogen target for laser driven proton acceleration 固体氢靶激光驱动质子加速

Europe Optics + Optoelectronics Pub Date : 2015-05-14 DOI: 10.1117/12.2176328

J. Perin, S. García, D. Chatain, D. Margarone

{"title":"Solid hydrogen target for laser driven proton acceleration","authors":"J. Perin, S. García, D. Chatain, D. Margarone","doi":"10.1117/12.2176328","DOIUrl":"https://doi.org/10.1117/12.2176328","url":null,"abstract":"The development of very high power lasers opens up new horizons in various fields, such as laser plasma acceleration in Physics and innovative approaches for proton therapy in Medicine. Laser driven proton acceleration is commonly based on the so-called Target Normal Sheath Acceleration (TNSA) mechanisms: a high power laser is focused onto a solid target (thin metallic or plastic foil) and interact with matter at very high intensity, thus generating a plasma; as a consequence “hot” electrons are produced and move into the forward direction through the target. Protons are generated at the target rear side, electrons try to escape from the target and an ultra-strong quasi-electrostatic field (~1TV/m) is generated. Such a field can accelerate protons with a wide energy spectrum (1-200 MeV) in a few tens of micrometers. The proton beam characteristics depend on the laser parameters and on the target geometry and nature. This technique has been validated experimentally in several high power laser facilities by accelerating protons coming from hydrogenated contaminant (mainly water) at the rear of metallic target, however, several research groups are investigating the possibility to perform experiments by using “pure” hydrogen targets. In this context, the low temperature laboratory at CEA-Grenoble has developed a cryostat able to continuously produce a thin hydrogen ribbon (from 40 to 100 microns thick). A new extrusion concept, without any moving part has been carried out, using only the thermodynamic properties of the fluid. First results and perspectives are presented in this paper.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134552009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spectra of plasmas of Ru, Rh, Pd and Mo produced with nanosecond and picosecond laser pulses 纳秒和皮秒激光脉冲产生Ru、Rh、Pd和Mo等离子体的光谱

Europe Optics + Optoelectronics Pub Date : 2015-05-14 DOI: 10.1117/12.2176551

R. Lokasani, E. Long, P. Sheridan, P. Hayden, F. O’Reilly, P. Dunne, A. Endo, J. Limpouch, G. O’Sullivan

引用次数: 2

Observation of monoenergetic protons from a near-critical gas target tailored by a hydrodynamic shock 由水动力激波剪裁的近临界气体靶单能质子的观测

Europe Optics + Optoelectronics Pub Date : 2015-05-14 DOI: 10.1117/12.2182094

Y.-H. Chen, M. Helle, A. Ting, D. Gordon, M. Polyanskiy, I. Pogorelsky, M. Babzien, Z. Najmudin

引用次数: 8

Longitudinal laser ion acceleration in low density targets: experimental optimization on the Titan laser facility and numerical investigation of the ultra-high intensity limit 低密度目标的纵向激光离子加速:泰坦激光设备的实验优化和超高强度极限的数值研究

Europe Optics + Optoelectronics Pub Date : 2015-05-14 DOI: 10.1117/12.2178675

E. D'humieres, S. Chen, M. Lobet, M. Scisciò, P. Antici, M. Bailly-Grandvaux, T. Gangolf, G. Revet, J. Santos, A. Schroer, O. Willi, V. Tikhonchuk, H. Pépin, J. Fuchs

{"title":"Longitudinal laser ion acceleration in low density targets: experimental optimization on the Titan laser facility and numerical investigation of the ultra-high intensity limit","authors":"E. D'humieres, S. Chen, M. Lobet, M. Scisciò, P. Antici, M. Bailly-Grandvaux, T. Gangolf, G. Revet, J. Santos, A. Schroer, O. Willi, V. Tikhonchuk, H. Pépin, J. Fuchs","doi":"10.1117/12.2178675","DOIUrl":"https://doi.org/10.1117/12.2178675","url":null,"abstract":"Recent theoretical and experimental studies suggest the possibility of enhancing the efficiency and ease of laser acceleration of protons and ions using underdense or near critical plasmas through electrostatic shocks. Very promising results were recently obtained in this regime. In these experiments, a first ns pulse was focused on a thin target to explode it and a second laser with a high intensity was focused on the exploded foil. The delay between two lasers allowed to control the density gradient seen by the second laser pulse. The transition between various laser ion acceleration regimes depending on the density gradient length was studied. With a laser energy of a few Joules, protons with energies close to the energies of TNSA accelerated protons were obtained for various exploded foils configurations. In the high energy regime (~180 J), protons with energies significantly higher than the ones of TNSA accelerated protons were obtained when exploding the foil while keeping a good beam quality. These results demonstrate that low-density targets are promising candidates for an efficient proton source that can be optimized by choosing appropriate plasma conditions. New experiments were also performed in this regime with gas jets. Scaling shock acceleration in the low density regime to ultra high intensities is a challenge as radiation losses and electron positron pair production change the optimization of the shock process. Using large-scale Particle-In-Cell simulations, the transition to this regime in which intense beams of relativistic ions can be produced is investigated.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129168373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis of electron injection in laser wakefield acceleration using betatron emission in capillary tubes 毛细管中电子注入激光尾流场加速的电子注入分析

Europe Optics + Optoelectronics Pub Date : 2015-05-14 DOI: 10.1117/12.2178654

F. Desforges, B. Paradkar, M. Hansson, T. Audet, J. Ju, I. Gallardo-González, B. Aurand, P. Lee, L. Senje, A. Persson, S. Dobosz-Dufrenoy, O. Lundh, G. Maynard, P. Monot, J. Vay, C. Wahlström, B. Cros

引用次数: 1