检索结果-南通市图书馆

High Power Laser Science and Engineering 2018年第2期6卷 38-44页

作者： Wei Chen Bowen Liu Youjian Song Lu Chai Qianjin Cui Qingjing Liu chingyue wang Minglie Hu Ultrafast Laser Laboratory Key Laboratory of Opto-Electronic Information Technology Ministry of Education School of Precision Instrument and Opto-Electronics Engineering Tianjin University Laize Photonics Co. Ltd

We demonstrate an all polarization-maintaining(PM) fiber mode-locked laser seeded, hybrid fiber/solid-slab picosecond pulse laser system which outputs 40 μJ, 10 ps pulses at the central wavelength of 1064 nm. The beam quality factors M2 in the unstable and stable directions are 1.35 and 1.31, respectively. 15 μJ picosecond pulses at the central wavelength of 355 nm are generated through third harmonic generation(THG) by using two Li B3 O5(LBO) crystals, in order to get better processing efficiency on polycrystalline diamonds. The high pulse energy and beam quality of these ultraviolet(UV) picosecond pulses are confirmed by latter experiments of material processing on polycrystalline diamonds. This scheme which combines the advantages of the all PM fiber mode-locked laser and the solid-slab amplifier enables compact, robust and chirped pulse amplification-free amplification with high power picosecond pulses.

关键词： all polarization-maintaining fiber chirped pulse amplification free amplification hybrid fiber/solid slab material processing mode-locked laser

High pulse energy femtosecond large-mode-area photonic crystal fiber laser

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2008年第23期53卷 3741-3745页

作者： SONG YouJian HU MingLiet ZHANG Chi CHAI Lu wang chingyue Ultrafast Laser Laboratory College of Precision Instruments and Opto-electronics Engineering Key Laboratory of Opto-electronicInformation Science and Technology of Ministry of Education Tianjin University Tianjin 300072 China

A high pulse energy femtosecond fiber laser based on a large-mode-area photonic crystal fiber is demonstrated. A segment of Yb-doped single-polarization large-mode-area photonic crystal fiber with extremely low nonlinearity is explored as gain media of this fiber laser, resulting in intrinsically environmentally stability. The fiber laser is based on a linear cavity with dispersion compensation free configuration, and the stable mode-locking is obtained by a semiconductor saturable absorber mirror (SESAM). The fiber laser directly generates 2.5 W of average power at a repetition rate of 51.4 MHz, corresponding to a single pulse energy of 50 nJ. The output pulse duration is 4.2 ps, which is dechirped to 410 fs after extracavity dispersion compensation. The nonlinear absorption of SESAM determines the pulse shaping at low output power, while the mode-locking mechanism is under the balance between spectrum broadening from self-phase-modulation and gain filtering at the high output power.

关键词：光晶体纤维光纤激光器脉冲能耗大模式纤维

Nonlinearity optimization of dissipative-soliton fiber laser for generation of pulses with 350 kW peak power

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2018年第2期6卷 98-102页

作者： Han Chi Bowen Liu Youjian Song Minglie Hu Lu Chai Weidong Shen Xu Liu chingyue wang Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Technology (Ministry of Education) School of Precision Instruments and Optoelectronics Engineering Tianjin University Department of Electrical and Computer Engineering Colorado State University State Key Laboratory of Modern Optical Instrumentation Zhejiang University

We demonstrate a nonlinearity optimization method by altering distribution of passive fibers in a dissipative-soliton mode-locked fiber laser to level up output parameters. In the numerical simulation, we found that the passive fiber segment after gain fiber characterizes the highest average B-integral among fiber segments. By reducing the length of this fiber section and keeping the total passive fiber length as constant, the output pulse energy can be effectively scaled up while maintaining a short dechirped pulse duration, resulting in boosting peak power. With this method, 37-n J pulses are generated from a dissipative-soliton mode-locked cladding pumped ytterbium-doped single-mode fiber laser in the experiment. The pulse can be dechirped to 66 fs with 350 k W peak power. Moreover, the pulse pedestal is suppressed by a vector-dispersion compressor.

关键词： fiber optics amplifiers and oscillators ultrafast lasers

Femtosecond laser microstructuring of nickel foil

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2010年第1期8卷 38-40页

作者：贾威周彬李珣柴路章若冰王清月 Ultrafast Laser Laboratory School of Precision Instruments and Opto-Electronics EngineeringTianjin UniversityKey Laboratory of Opto-Electronic Information Technical ScienceMinistry of Education of China

We observe the morphological change and grain structure of Ni foil when it is ablated with femtosecond laser pulses. Scanning electron microscopy and field emission transmission electron microscopy are used to study the nature of the morphology and grain structure of nickel foil and determine the essential features. The results indicate that there are many random uanostructures in the center of the ablated region composed of nanocrystalline grains as well as some core-shell structures phase explosion and extremely high cooling rate are the for the formation of surface nanostructures. The observed morphologies seem to suggest that most probable physical mechanisms responsible

关键词： Crystal microstructure Field emission Grain size and shape Morphology Nanostructures Nickel alloys Pulsed laser applications Scanning electron microscopy Surface chemistry Transmission electron microscopy

Hybrid femtosecond laser system based on a Yb:KGW regenerative amplifier for N_P polarization

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2019年第4期17卷 71-74页

作者： Dongyu Yan Bowen Liu Yuxi Chu Huanyu Song Lu Chai Minglie Hu chingyue wang Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Science and Technology of Ministry of Education School of Precision Instruments and Opto-electronics Engineering Tianjin University

We report a hybrid femtosecond laser system based on a femtosecond Yb-doped fiber laser and a Yb-doped potassium gadolinium tungstate(Yb:KGW) regenerative amplifier. To match the central wavelength of the seed source, a Yb:KGW crystal is used in the regenerative amplifier for N_p polarization. We study and optimize the dynamics of nonlinear amplification to alleviate the gain narrowing effect. With optimization, the system can output 270 fs pulses with 21 μJ pulse energy at a 60 kHz repetition rate.

关键词： hybrid femtosecond femtosecond Yb-doped 60 kHz repetition

Prism Material Dispersion Effects on the Total Dispersion of Prism Pair System

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1997年第4期 67-72页

作者： SUN Hong wang chingyue(Ultrafast Laser Laboratory, College of Precision Instruments and Photoelectronic Engineering, Tianjin University, Tianjin 300072, China)

ＰｒｉｓｍＭａｔｅｒｉａｌＤｉｓｐｅｒｓｉｏｎＥｆｅｃｔｓｏｎｔｈｅＴｏｔａｌＤｉｓｐｅｒｓｉｏｎｏｆＰｒｉｓｍＰａｉｒＳｙｓｔｅｍＳＵＮＨｏｎｇＷＡＮＧＣｈｉｎｇｙｕｅ（ＵｌｔｒａｆａｓｔＬａｓｅｒＬａｂｏｒ... 详细信息

ＰｒｉｓｍＭａｔｅｒｉａｌＤｉｓｐｅｒｓｉｏｎＥｆｅｃｔｓｏｎｔｈｅＴｏｔａｌＤｉｓｐｅｒｓｉｏｎｏｆＰｒｉｓｍＰａｉｒＳｙｓｔｅｍＳＵＮＨｏｎｇＷＡＮＧＣｈｉｎｇｙｕｅ（ＵｌｔｒａｆａｓｔＬａｓｅｒＬａｂｏｒａｔｏｒｙ，ＣｏｌｅｇｅｏｆＰｒｅ...

关键词： femtosecond pulse laser prism pair group velocity dispersion third order dispersion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

飞秒脉冲参量影响金属表面热特性的研究*

光子学报 2006年第1期35卷 1-4页

作者：倪晓昌王清月梁建国天津大学精密仪器与光电子工程学院超快激光研究室光电信息技术科学教育部重点实验室天津300072

采用有限差分法对约化后的双温方程进行数值模拟·研究了飞秒激光与金属铜相互作用时,脉冲形状对烧蚀结果的影响.结果表明:脉冲能量确定时,脉冲形状对烧蚀结果影响不大;多脉冲作用时,脉冲重复频率只有在一定范围内(随材料属性改变),脉... 详细信息

采用有限差分法对约化后的双温方程进行数值模拟·研究了飞秒激光与金属铜相互作用时,脉冲形状对烧蚀结果的影响.结果表明:脉冲能量确定时,脉冲形状对烧蚀结果影响不大;多脉冲作用时,脉冲重复频率只有在一定范围内(随材料属性改变),脉冲间的热累积效应才存在;对传导性好的金属材料,热累积效应不明显·并实验证实了上述结果·

关键词：飞秒激光有限差分双温方程热累积效应

掺钛蓝宝石晶体的连续光和自锁模运转的实验研究

在线全文

学校读者我要写书评

暂无评论

中国激光 1996年第2期23卷 107-110页

作者：戴建明王清月张强邓佩珍天津大学精密仪器工程系中国科学院上海光机所

对上海光机所生产的国产掺钛蓝宝石晶体进行了大量的连续光运转和自锁模运转的实验研究，获得了与进口掺钛蓝宝石晶体相当的实验指标．并且结合实验结果．详细评估了国产掺钛蓝宝石晶体的质量．

关键词：掺钛蓝石晶体自锁模蓝石激光器连续光

高功率光纤飞秒激光放大器的研究现状与发展趋势

在线全文

学校读者我要写书评

暂无评论

中国激光 2019年第5期46卷 136-161页

作者：闫东钰刘博文宋寰宇李源储玉喜柴路胡明列王清月天津大学精密仪器与光电子工程学院超快激光研究室&光电信息技术教育部重点实验室

针对高功率光纤飞秒激光放大器,介绍了啁啾脉冲放大(CPA)技术的基本原理,讨论了该结构中关键的展宽器和压缩器的发展现状与瓶颈;介绍了典型的大模场面积光纤的结构和工作原理,简介了基于大模场面积光纤的CPA系统的发展现状;介绍了非线... 详细信息

针对高功率光纤飞秒激光放大器,介绍了啁啾脉冲放大(CPA)技术的基本原理,讨论了该结构中关键的展宽器和压缩器的发展现状与瓶颈;介绍了典型的大模场面积光纤的结构和工作原理,简介了基于大模场面积光纤的CPA系统的发展现状;介绍了非线性放大技术,讨论了实现更窄脉冲宽度、更高脉冲质量的光纤飞秒激光放大方案;最后分析了全光纤结构、相干合束、单晶光纤增益介质以及皮秒种子源等新型技术,并总结了高功率光纤飞秒激光放大器的发展趋势。

关键词：飞秒激光光纤放大器啁啾脉冲放大(CPA) 非线性放大脉冲相干合束

在线全文

学校读者我要写书评

暂无评论

飞秒激光HpD双光子荧光法诊断癌症

中国激光 2000年第8期27卷 765-768页

作者：邢岐荣魏赫颖王明伟柴路张伟力王清月苗绪红李迎新天津大学精仪学院超快激光研究室光电信息技术科学教育部重点实验室天津300072 天津市医科大学激光医学实验室天津300070

提出了飞秒激光外源性血卟啉 Hp D 双光子荧光诊断癌症的新方法 .采用自锁模掺钛蓝宝石激光器输出的飞秒激光脉冲激发注入 Hp D的小鼠癌组织部位 ,观察到 Hp D的双光子荧光谱 ,而对照的正常组织部位则观察不到明显的双光子荧光 .实验... 详细信息

提出了飞秒激光外源性血卟啉 Hp D 双光子荧光诊断癌症的新方法 .采用自锁模掺钛蓝宝石激光器输出的飞秒激光脉冲激发注入 Hp D的小鼠癌组织部位 ,观察到 Hp D的双光子荧光谱 ,而对照的正常组织部位则观察不到明显的双光子荧光 .实验结果显示。

关键词：飞秒激光 HpD 双光子荧光法癌症诊断