International Symposium on High Power Laser Systems and Applications最新文献_第8页

Optical resonator with nonuniform magnification for improving beam uniformity of chemical oxygen iodine lasers 用于改善化学氧碘激光器光束均匀性的非均匀放大光学谐振器

International Symposium on High Power Laser Systems and Applications Pub Date : 2015-02-03 DOI: 10.1117/12.2065283

Kenan Wu, Yang Sun, Y. Huai, Shuqin Jia, Xi Chen, Yuqi Jin

{"title":"Optical resonator with nonuniform magnification for improving beam uniformity of chemical oxygen iodine lasers","authors":"Kenan Wu, Yang Sun, Y. Huai, Shuqin Jia, Xi Chen, Yuqi Jin","doi":"10.1117/12.2065283","DOIUrl":"https://doi.org/10.1117/12.2065283","url":null,"abstract":"Unstable resonator with nonuniform magnification for improving the beam uniformity of chemical oxygen iodine lasers is explored for the first time. The magnification of the resonator is a function of the radial coordinate of the polar coordinate system on the front mirror surface. A resonator was designed to have a lower magnification at the center of the resonator than at the edge. The resonator consists of two aspherical mirrors. Method for designing the resonator is given. The energy conservation law and the aplanatic condition were used to derive the designing principle of the two aspherical mirrors. The design result was fitted to polynomial form which is suitable for manufacturing. Numerical experiment was carried out to evaluate the performance of the resonator. The computation was based on coupled simulation of wave optics model and computational fluid mechanics model. Results proved the effectiveness of the design method. The design tends to enhance the intensity near the center of the output beam and cripple that near the edge. Further analysis revealed that this effect is induced because rays of light are reflected more densely at the center of the pupil than at the edge. Therefore, this design affords for a potential approach for improving the near field uniformity of chemical oxygen iodine lasers.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"519 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132322875","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

1540-nm single frequency single-mode pulsed all fiber laser for coherent Doppler lidar 用于相干多普勒激光雷达的1540nm单频单模脉冲全光纤激光器

International Symposium on High Power Laser Systems and Applications Pub Date : 2015-02-03 DOI: 10.1117/12.2064725

Xin Zhang, Weifeng Diao, Yuan Liu, Jiqiao Liu, X. Hou, Weibiao Chen

引用次数: 3

Beam quality active control of a slab MOPA solid state laser 板状MOPA固体激光器光束质量的主动控制

International Symposium on High Power Laser Systems and Applications Pub Date : 2015-02-03 DOI: 10.1117/12.2065448

Rujian Xiang, Kai Zhang, Jing Wu, Yinglei Du, Zhong-yong Luo, Zhong He, Honglai Xu

{"title":"Beam quality active control of a slab MOPA solid state laser","authors":"Rujian Xiang, Kai Zhang, Jing Wu, Yinglei Du, Zhong-yong Luo, Zhong He, Honglai Xu","doi":"10.1117/12.2065448","DOIUrl":"https://doi.org/10.1117/12.2065448","url":null,"abstract":"The wavefront of the output high power laser beam generated by a MOPA laser system with slab gain medium was measured and analyzed by an H-S wavefront sensor, the wavefront measured consisted the static aberration of the whole optic chain and the dynamic component caused by the laser driver. Analyzing results showed that the temporal frequency of the beam aberration was mostly less than 10Hz, but the spatial distribution of the aberration was more challengeable to the phase compensation. Due to the narrow rectangle shape of the laser gain medium and the none uniformity of the pumping and cooling, it had some local big slope cross the beam section, that caused a lot of difficulties to the aberration measuring and wavefront correcting, there were many high order components in the wide direction cross the beam, but the phase aberration was more smooth in the vertical direction. A beam expander which has different ratio in the x/y directions had been used for matching the beam aperture and the valid controlling range of the deformable mirror. An adaptive optical system consisted of an H-S wavefront sensor and a deformable mirror (DM) with 67 valid actuators which arranged in two dimensions as hexagon designed to compensate the phase aberration. The driving vector of the deformable mirror was calculated from the spot array which sampled by the H-S wavefront sensor from the target beam, the surface response of all actuators were pre-calibrated and saved as a matrix. The matrix invert method was used to calculate the driving vectors in the close loop steps. The beam quality factor β was adapted to evaluate the output beam from the adaptive optical system. Simulation and experiment results of the close loop correction about the adaptive optical system showed that the aberration was compensated to a very low level and the far field beam quality of the high power laser could reach 1.67xDL.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"9255 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130855080","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: 8

Regular sub-wavelength surface structures induced by femtosecond laser pulses on nickel 飞秒激光脉冲在镍表面诱导的规则亚波长表面结构

International Symposium on High Power Laser Systems and Applications Pub Date : 2015-02-03 DOI: 10.1117/12.2063875

L. Qi

{"title":"Regular sub-wavelength surface structures induced by femtosecond laser pulses on nickel","authors":"L. Qi","doi":"10.1117/12.2063875","DOIUrl":"https://doi.org/10.1117/12.2063875","url":null,"abstract":"In this research, the formation of laser-induced periodic surface structures (LIPSS) on the nickel surface by femtosecond laser pulses was investigated. In the experiment, we used a commercially available amplified Ti:sapphire laser system that generated 164 fs laser pulses with a maximum pulse energy (Ep) of 1 mJ at a 1 kHz repetition rate and with a central wavelength λ= 780 nm. To obtain a fine periodic ordering of surface nanostructures, the laser beam, through a 0.2 mm pinhole aperture positioned near the 10× objective lens, was focused onto the sample. The samples were mounted on an XYZ-translation stage and irradiated in static and line-scanning experiment. The morphology of the induced periodic structure was examined by scanning electron microscopy. The surface profile was measured by atomic force microscopy. LIPSS with a period of around 700 nm entirely covered the irradiated area. Large area of LIPSS in the nickel surface was produced in line-scanning experiment. The mechanism of the formation of LIPSS in the entire irradiated area in static irradiation was discussed. The function of a 0.2 mm pinhole aperture was studied. The regular LIPSS on the nickel surface changed the optical property of the surface. The regular LIPSS on nickel surface could be also applied on the micro-mould fabrication.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133597483","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

Investigation on the influence of spectral linewidth broadening on beam quality in spectral beam combination 谱束组合中谱线宽展宽对光束质量影响的研究

International Symposium on High Power Laser Systems and Applications Pub Date : 2015-02-03 DOI: 10.1117/12.2065455

F. Tian, Hong Yan, Li Chen, Yidong Ye, Jianming Li, Jiawen Luo, Fei Lu

引用次数: 4

Study about the 6-DOF parallel tracking platform 六自由度并联跟踪平台的研究

International Symposium on High Power Laser Systems and Applications Pub Date : 2015-02-03 DOI: 10.1117/12.2065342

S. Tan, G. Ren, Y. Tan

引用次数: 0

Simulation of phase noise for coherent beam combination 相干光束组合的相位噪声仿真

International Symposium on High Power Laser Systems and Applications Pub Date : 2015-02-03 DOI: 10.1117/12.2065300

Qi-qi Hu, Zhi-Meng Huang, Xuan Tang, Yong-quan Luo, Da-yong Zhang

引用次数: 0

Peculiarities of radiation formation in laser systems for remote sensing 遥感激光系统中辐射形成的特性

International Symposium on High Power Laser Systems and Applications Pub Date : 2015-02-03 DOI: 10.1117/12.2065352

Y. Panchenko, M. Andreev, V. Losev, A. Puchikin

引用次数: 0

PCIE interface design for high-speed image storage system based on SSD 基于SSD的高速镜像存储系统的PCIE接口设计

International Symposium on High Power Laser Systems and Applications Pub Date : 2015-02-03 DOI: 10.1117/12.2065366

Shiming Wang

{"title":"PCIE interface design for high-speed image storage system based on SSD","authors":"Shiming Wang","doi":"10.1117/12.2065366","DOIUrl":"https://doi.org/10.1117/12.2065366","url":null,"abstract":"This paper proposes and implements a standard interface of miniaturized high-speed image storage system, which combines PowerPC with FPGA and utilizes PCIE bus as the high speed switching channel. Attached to the PowerPC, mSATA interface SSD(Solid State Drive) realizes RAID3 array storage. At the same time, a high-speed real-time image compression patent IP core also can be embedded in FPGA, which is in the leading domestic level with compression rate and image quality, making that the system can record higher image data rate or achieve longer recording time. The notebook memory card buckle type design is used in the mSATA interface SSD, which make it possible to complete the replacement in 5 seconds just using single hand, thus the total length of repeated recordings is increased. MSI (Message Signaled Interrupts) interruption guarantees the stability and reliability of continuous DMA transmission. Furthermore, only through the gigabit network, the remote display, control and upload to backup function can be realized. According to an optional 25 frame/s or 30 frame/s, upload speeds can be up to more than 84 MB/s. Compared with the existing FLASH array high-speed memory systems, it has higher degree of modularity, better stability and higher efficiency on development, maintenance and upgrading. Its data access rate is up to 300MB/s, realizing the high speed image storage system miniaturization, standardization and modularization, thus it is fit for image acquisition, storage and real-time transmission to server on mobile equipment.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"134 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117328736","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: 3

Numerical analysis to four-wave mixing induced spectral broadening in high power fiber lasers 高功率光纤激光器四波混频诱导光谱展宽的数值分析

International Symposium on High Power Laser Systems and Applications Pub Date : 2015-02-03 DOI: 10.1117/12.2065493

Yujun Feng, Xiao-Jun Wang, Weiwei Ke, Yinhong Sun, Kai Zhang, Yi Ma, Tenglong Li, Yanshan Wang, Juan Wu

{"title":"Numerical analysis to four-wave mixing induced spectral broadening in high power fiber lasers","authors":"Yujun Feng, Xiao-Jun Wang, Weiwei Ke, Yinhong Sun, Kai Zhang, Yi Ma, Tenglong Li, Yanshan Wang, Juan Wu","doi":"10.1117/12.2065493","DOIUrl":"https://doi.org/10.1117/12.2065493","url":null,"abstract":"For powers exceeding a threshold the spectral broadening in fiber amplifiers becomes a significant challenge for the development of high power narrow bandwidth fiber lasers. In this letter, we show that the spectral broadening can be partly caused by four-wave mixing(FWM) process in which the power of the central wavelength would transfer to the side ones. A practical FWM induced spectral broadening theory has been derived from the early works. A numerical model of fiber amplifier has been established and FWM process has been added to the model. During the simulation process, we find that when a 10 GHz, several watts narrow bandwidth laser is seeded into a few modes fiber laser amplifier, the FWM induced spectral broadening effect might continually increase the FWHM of the spectra of the continuum laser to 100 GHz within the amplification process to several hundred watts which has been convinced by our experiments. Some other results have also been analyzed in this paper to complete the four-wave mixing induced spectral broadening theory in fiber amplifiers.","PeriodicalId":293926,"journal":{"name":"International Symposium on High Power Laser Systems and Applications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124820925","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: 8