Europe Optics + Optoelectronics最新文献_第10页

The SPARC_LAB femtosecond synchronization for electron and photon pulsed beams 电子和光子脉冲光束的SPARC_LAB飞秒同步

Europe Optics + Optoelectronics Pub Date : 2015-05-12 DOI: 10.1117/12.2185103

M. Bellaveglia, A. Gallo, L. Piersanti, R. Pompili, G. Gatti, M. Anania, M. Petrarca, F. Villa, E. Chiadroni, A. Biagioni, A. Mostacci

{"title":"The SPARC_LAB femtosecond synchronization for electron and photon pulsed beams","authors":"M. Bellaveglia, A. Gallo, L. Piersanti, R. Pompili, G. Gatti, M. Anania, M. Petrarca, F. Villa, E. Chiadroni, A. Biagioni, A. Mostacci","doi":"10.1117/12.2185103","DOIUrl":"https://doi.org/10.1117/12.2185103","url":null,"abstract":"The SPARC LAB complex hosts a 150 MeV electron photo-injector equipped with an undulator for FEL production (SPARC) together with a high power TW laser (FLAME). Recently the synchronization system reached the performance of < 100 fsRMS relative jitter between lasers, electron beam and RF accelerating fields. This matches the requirements for next future experiments: (i) the production of X-rays by means of Thomson scattering (first collisions achieved in 2014) and (ii) the particle driven PWFA experiment by means of multiple electron bunches. We report about the measurements taken during the machine operation using BAMs (Bunch Arrival Monitors) and EOS (Electro-Optical Sampling) system. A new R and D activity concerning the LWFA using the external injection of electron bunches in a plasma generated by the FLAME laser pulse is under design. The upgrade of the synchronization system is under way to guarantee the < 30 fs RMS jitter required specification. It foresees the transition from electrical to optical architecture that mainly affects the reference signal distribution and the time of arrival detection performances. The new system architecture is presented together with the related experimental data.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131543927","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: 2

FERMI longitudinal diagnostics: results and future challenges FERMI纵向诊断:结果和未来的挑战

Europe Optics + Optoelectronics Pub Date : 2015-05-12 DOI: 10.1117/12.2182515

M. Veronese, E. Ferrari, E. Allaria, P. Cinquegrana, L. Froelich, L. Giannessi, G. Penco, M. Predonzani, F. Rossi, P. Sigalotti, M. Ferianis

{"title":"FERMI longitudinal diagnostics: results and future challenges","authors":"M. Veronese, E. Ferrari, E. Allaria, P. Cinquegrana, L. Froelich, L. Giannessi, G. Penco, M. Predonzani, F. Rossi, P. Sigalotti, M. Ferianis","doi":"10.1117/12.2182515","DOIUrl":"https://doi.org/10.1117/12.2182515","url":null,"abstract":"The seeded FEL FERMI has completed the commissioning of both the FEL lines, and it is now providing the user community with a coherent and tunable UV radiation (from 100 nm to 4 nm) in a number of different configurations. These also include original FEL-pump - FEL-probe schemes with twin-seeded FEL pulses. Among the key systems for the operation of FERMI, there is the femtosecond optical timing system and dedicated longitudinal diagnostics, specifically developed for FERMI. In this paper, after a short review of the FERMI optical timing system and of its routinely achieved performances, we focus on the results obtained from the suite of longitudinal diagnostics (Bunch Arrival Monitor, Electro Optical sampling station and RF deflectors) all operating in single shot and with 10s fs resolution which demonstrate the FERMI achieved performances. The longitudinal diagnostics measurements are compared between these device and other device on shot-to-shot basis, looking for correlations between machine parameters. Finally future challenges in terms of improvement of existing diagnostics, planned installations and possible upgrades are discussed.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130496756","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

Polarizers for a spectral range centered at 121.6 nm operating by reflectance or by transmittance 以121.6纳米为中心的光谱范围的偏振光片，通过反射或透射来工作

Europe Optics + Optoelectronics Pub Date : 2015-05-12 DOI: 10.1117/12.2179446

J. Larruquert, A. M. Malvezzi, A. Giglia, J. Aznárez, L. R. Rodríguez-de Marcos, J. A. Méndez, P. Miotti, F. Frassetto, G. Massone, G. Capobianco, S. Fineschi, S. Nannarone

{"title":"Polarizers for a spectral range centered at 121.6 nm operating by reflectance or by transmittance","authors":"J. Larruquert, A. M. Malvezzi, A. Giglia, J. Aznárez, L. R. Rodríguez-de Marcos, J. A. Méndez, P. Miotti, F. Frassetto, G. Massone, G. Capobianco, S. Fineschi, S. Nannarone","doi":"10.1117/12.2179446","DOIUrl":"https://doi.org/10.1117/12.2179446","url":null,"abstract":"Polarimetry is a powerful tool to interpret how the coronal plasma is involved in the energy transfer processes from the Sun’s inner parts to the outer space. Space polarimetry in the far ultraviolet (FUV) provides essential information of processes governed by the Doppler and Hanle resonant electron scattering effects. Among the key FUV spectral lines to observe these processes, H I Lyman α (121.6 nm) is the most intense. Some developing or proposed solar physics missions, such as CLASP, SolmeX, and COMPASS, plan to perform polarimetry at 121.6 nm. Classical solutions, such as a parallel plate of a transparent material, either MgF2 or LiF, result in a modest efficiency of the passing polarization component. The development of more efficient linear polarizers at this wavelength will benefit future space instruments. A research has been conducted to develop polarizers based on (Al/MgF2)n multilayer coatings in a band containing 121.6 nm, to obtain a significant efficiency increase over plates. Coatings operating by reflectance resulted in a high efficiency after approximately one year of storage under nitrogen. In parallel, coating polarizers operating by transmittance have been prepared for the first time. Transmissive polarizers have the advantage that they involve no deviation of the beam. As a further benefit, the developed transmittance polarizers additionally incorporate filtering properties to help reject wavelengths both shortwards and longwards of a band containing 121.6 nm. Hence a polarizer combined with a filter is obtained with a single device. The combined polarizer-filter could enable a higher performance polarimeter for solar physics if the use of a separate filter to isolate Lyman α turns unnecessary.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"272 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131647939","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

Generation of femtosecond to sub-femtosecond x-ray pulses in free-electron lasers 自由电子激光器中飞秒至亚飞秒x射线脉冲的产生

Europe Optics + Optoelectronics Pub Date : 2015-05-12 DOI: 10.1117/12.2182307

Yuantao Ding

引用次数: 1

Damage to inorganic materials illuminated by focused beam of x-ray free-electron laser radiation 聚焦x射线自由电子激光辐照对无机材料的损伤

Europe Optics + Optoelectronics Pub Date : 2015-05-12 DOI: 10.1117/12.2182778

T. Koyama, H. Yumoto, K. Tono, T. Togashi, Y. Inubushi, T. Katayama, Jangwoo Kim, S. Matsuyama, M. Yabashi, K. Yamauchi, H. Ohashi

引用次数: 6

AlGaInN laser diode bar and array technology for high power and individually addressable applications 用于高功率和可单独寻址应用的AlGaInN激光二极管条和阵列技术

Europe Optics + Optoelectronics Pub Date : 2015-05-12 DOI: 10.1117/12.2081358

S. Najda, P. Perlin, T. Suski, L. Marona, M. Boćkowski, M. Leszczynski, P. Wiśniewski, R. Czernecki, R. Kucharski, G. Targowski

引用次数: 1

Multi-mJ, kHz picosecond deep UV source based on a frequency-quadrupled cryogenic Yb:YAG laser 基于四倍频低温Yb:YAG激光器的多mj, kHz皮秒深紫外源

Europe Optics + Optoelectronics Pub Date : 2015-05-12 DOI: 10.1117/12.2179937

K. Hong, Chun-Lin L. Chang, P. Krogen, H. Liang, G. J. Stein, J. Moses, Chien-Jen Lai, F. Kärtner

引用次数: 7

An intra-cavity device with a discharge-drived CW DF chemical laser 放电驱动连续波DF化学激光器的腔内装置

Europe Optics + Optoelectronics Pub Date : 2015-05-12 DOI: 10.1117/12.2177963

B. Yan, Wenguang Liu, Qiong Zhou, Shengfu Yuan, Q. Lu

{"title":"An intra-cavity device with a discharge-drived CW DF chemical laser","authors":"B. Yan, Wenguang Liu, Qiong Zhou, Shengfu Yuan, Q. Lu","doi":"10.1117/12.2177963","DOIUrl":"https://doi.org/10.1117/12.2177963","url":null,"abstract":"The performance parameters of reflecting mirrors such as absorption coefficient or thermal distortion determine the beam quality of the output laser, so the quality of mirrors is one of the most important factors affecting the capability of the whole laser system. At the present time, there was obviously insufficient in test methods for the mirrors performance. The reflection coefficient, absorption coefficient and scattering coefficient of mirrors could be measured by a lot of test methods such as cavity ring-down method, photothermal deflection method, surface thermal lens method and laser calorimetry. But these methods could not test under high power density radiation. So the test data and results could not indicate the real performance in a real laser system exactly. Testing in a real laser system would be expensive and time consuming. Therefore, the test sequence and data would not be sufficient to analyze and realize the performance of mirrors. To examine the performance of mirrors under high power density radiation, the working principle of intra-cavity was introduced in this paper. Utilizing an output mirror with a low output coupling ratio, an intra-cavity could produce high-power density laser in the resonant cavity on the basis of a relatively small scale of gain medium, and the consumption and cost were very low relatively. Based on a discharge-drived CW DF chemical laser, an intra-cavity device was established. A laser beam of 3kw/cm2 was achieved in the resonant cavity. Two pieces of 22.5 degree mirrors and two pieces of 45 degree mirrors could be tested simultaneously. Absorption coefficient and thermal distortion were measured by calorimetry and Hartmann wavefront sensor respectively. This device was simple, convenient, low-maintenance, and could work for a long time. The test results would provide support for process improvement of mirrors.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126091885","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: 2

Investigation of Yb3+-doped alumino-silicate glasses for high energy class diode pumped solid state lasers 高能二极管泵浦固体激光器用掺Yb3+铝硅酸盐玻璃的研究

Europe Optics + Optoelectronics Pub Date : 2015-05-12 DOI: 10.1117/12.2182067

J. Körner, J. Hein, Mirko Tiegel, S. Kuhn, J. Buldt, Fangxin Yue, R. Seifert, A. Herrmann, C. Rüssel, M. Kaluza

{"title":"Investigation of Yb3+-doped alumino-silicate glasses for high energy class diode pumped solid state lasers","authors":"J. Körner, J. Hein, Mirko Tiegel, S. Kuhn, J. Buldt, Fangxin Yue, R. Seifert, A. Herrmann, C. Rüssel, M. Kaluza","doi":"10.1117/12.2182067","DOIUrl":"https://doi.org/10.1117/12.2182067","url":null,"abstract":"We present a detailed investigation of different compositions of Yb3+-doped alumino-silicate glasses as promising materials for diode-pumped high-power laser applications at 1030 nm due to their beneficial thermo-mechanical properties. To generate comprehensive datasets for emission and absorption cross sections, the spectral properties of the materials were recorded at temperatures ranging from liquid nitrogen to room temperature. It was found that the newly developed materials offer higher emission cross sections at the center laser wavelength of 1030 nm than the so far used alternatives Yb:CaF2 and Yb:FP-glass. This results in a lower saturation fluence that offers the potential for higher laser extraction efficiency. Fluorescence lifetime quenching of first test samples was analyzed and attributed to the hydroxide (OH) concentration in the host material. Applying a sophisticated glass manufacturing process, OH concentrations could be lowered by up to two orders of magnitude, rising the lifetime and the quantum efficiency for samples doped with more than 6.1020 Yb3+ -ions per cm³. First laser experiments showed a broad tuning range of about 60 nm, which is superior to Yb:CaF2 and Yb:FP-glass in the same setup. Furthermore, measurements of the laser induced damage threshold (LIDT) for different coating techniques on doped substrates revealed the appropriateness of the materials for short pulse high-energy laser amplification.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123823697","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: 9

Method of aligning a four-grating compressor for the petawatt-class PEARL-X laser system petawatt级PEARL-X激光系统四光栅压缩器调正方法

Europe Optics + Optoelectronics Pub Date : 2015-05-12 DOI: 10.1117/12.2178871

I. Yakovlev

引用次数: 0