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A 54-fs diode-pumped Kerr-lens mode-locked Yb:LuYSiO_(5) laser
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作者 于洋 陈月航 +8 位作者 田文龙 郑立 王阁阳 白川 田轩 麦海静 苏玉龙 朱江峰 魏志义 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第6期255-258,共4页
We demonstrate a Kerr-lens mode-locked Yb:Lu YSiO_(5)(Yb:LYSO)laser with the pulse duration of 54 fs,corresponding to a spectral bandwidth of 25 nm centered at 1062 nm.To the best of our knowledge,this is the shortest... We demonstrate a Kerr-lens mode-locked Yb:Lu YSiO_(5)(Yb:LYSO)laser with the pulse duration of 54 fs,corresponding to a spectral bandwidth of 25 nm centered at 1062 nm.To the best of our knowledge,this is the shortest pulse duration obtained from Yb:LYSO laser.At the repetition rate of 378.3 MHz,an output power of 111.6 m W is obtained using an output coupler with 0.6%transmittance,which can maintain long-time stable mode-locking more than 13 h. 展开更多
关键词 DIODE-PUMPED MODE-LOCKING FEMTOSECOND all-solid-state laser
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Comparison of nominal and standardized catch per unit effort data in quantifying habitat suitability of skipjack tuna in the equatorial Pacific Ocean 被引量:3
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作者 Cheng Zhou Yuanyuan Hu +6 位作者 Jie Cao Liuxiong Xu Xuefang Wang Rong Wan Yu Xiao jiangfeng zhu Hao Tang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2022年第3期1-10,共10页
In the western and central Pacific Ocean,upper strata waters exhibit highly dynamic oceanographic features under ENSO variability.This has been proved to be responsible for the dynamic change of both abundance and zon... In the western and central Pacific Ocean,upper strata waters exhibit highly dynamic oceanographic features under ENSO variability.This has been proved to be responsible for the dynamic change of both abundance and zonal distribution of skipjack tuna(Katsuwonus pelamis).Although causality has been suggested by researchers using physical-biological interaction models,cumulative evidence needs to be obtained and the tenability of assertion needs to be tested from an ecological habitat perspective,based on fisheries data.For purse seine fishery,the use of catch per unit effort(CPUE)as an indication of the abundance is confusing because of technical improvements over the whole exploitation history and unbalanced individual fishing characteristic of vessels.It is particularly interesting to discriminate between habitat characteristics in comparative scenarios of CPUE application.This study identified habitat traits based on a series of oceanographic factors from a global ocean reanalysis model.A comparison was conducted between two habitat models based on unprocessed purse seine CPUE and standardized CPUE considering fishing characteristics.The results suggest that standardized CPUE could model the regular zonal shift of habitat compatible with the observed fishing efforts transfer,and achieved better prediction capacity than unprocessed CPUE.Furthermore,the habitat of skipjack tuna was also characterized and linked with surface and subsurface thermal environment,ocean current,dissolved oxygen,biotic environment,and ENSO variability.The monthly-averaged habitat suitable index,derived from the optimal habitat model prediction,showed a significant linear relationship with the southern oscillation index,which suggested that El Ni?o episodes eventually provide more preferable habitat for skipjack tuna under ENSO variability. 展开更多
关键词 skipjack tuna free-swimming schools habitat characteristics ENSO events CPUE standardization
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Topology-based analysis of pelagic food web structure in the central and eastern tropical Pacific Ocean based on longline observer data 被引量:2
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作者 Qinqin Lin jiangfeng zhu 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2020年第6期1-9,共9页
The tropical Pacific Ocean supports many productive commercial fisheries.However,few studies of ecosystem structure in the tropical Pacific Ocean have been carried out.In this study,we analyzed the food web structure ... The tropical Pacific Ocean supports many productive commercial fisheries.However,few studies of ecosystem structure in the tropical Pacific Ocean have been carried out.In this study,we analyzed the food web structure in the central and eastern tropical Pacific Ocean based on trophic relationships of 35 pelagic species collected by Chinese tuna longline observers from June to November in 2017.Topology indices(node degree,D;centrality indices,BC and CC;topological importance indices,TI^1,TI^3;keystone indices,K,K_t and K_b)and Key-Player algorithms(KPP-1,KPP-2)were used to select key species and construct a simplified food web combined with body size data.The Kendall rank correlation and hierarchical clustering analysis indicated that different topology indices resulted in consistent rankings of key species.Most key species were the same as those selected in other studies in the Pacific Ocean,such as Shortbill spearfish(Tetrapturus angustirostris),Swordfish(Xiphias gladius),Albacore tuna(Thunnus alalunga),cephalopods and scomber.The food web would be separated into many unconnected parts(F=0.632,FD=0.795,R^D=0.957)after the removal of the five key species,indicating the key roles of these species in the food web structure and stability.Body size was considered an influential indicator in constructing the simplified food web.This study can improve our understanding of the food web structure in the tropical Pacific Ocean and provide scientific basis for further ecosystem dynamics studies. 展开更多
关键词 TOPOLOGY food web structure tropical Pacific key species size structure
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The classification of plants by laser-induced breakdown spectroscopy based on two chemometric methods 被引量:2
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作者 Zhongqi FENG Dacheng ZHANG +3 位作者 Bowen WANG Jie DING Xuyang LIU jiangfeng zhu 《Plasma Science and Technology》 SCIE EI CAS CSCD 2020年第7期92-97,共6页
The applications of laser-induced breakdown spectroscopy(LIBS) on classifying complex natural organics are relatively limited and their accuracy still requires improvement.In this work,to study the methods on classifi... The applications of laser-induced breakdown spectroscopy(LIBS) on classifying complex natural organics are relatively limited and their accuracy still requires improvement.In this work,to study the methods on classification of complex organics,three kinds of fresh leaves were measured by LIBS.100 spectra from 100 samples of each kind of leaves were measured and then they were divided into a training set and a test set in a ratio of 7:3.Two algorithms of chemometric methods including the partial least squares discriminant analysis(PLS-DA) and principal component analysis Mahalanobis distance(PCA-MD) were used to identify these leaves.By using 23 lines from 16 elements or molecules as input data,these two methods can both classify these three kinds of leaves successfully.The classification accuracies of training sets are both up to 100% by PCA-MD and PLS-DA.The classification accuracies of the test set are 93.3% by PCA-MD and 97.8% by PLS-DA.It means that PLS-DA is better than PCA-MD in classifying plant leaves.Because the components in PLS-DA process are more suitable for classification than those in PCA-MD process.We think that this work can provide a reference for plant traceability using LIBS. 展开更多
关键词 laser-induced breakdown spectroscopy principal component analysis Mahalanobis distance partial least squares discriminant analysis classification of complex organics
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Convolutional neural network for transient grating frequency-resolved optical gating trace retrieval and its algorithm optimization 被引量:1
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作者 Siyuan Xu Xiaoxian zhu +7 位作者 Ji Wang Yuanfeng Li Yitan Gao Kun Zhao jiangfeng zhu Dacheng Zhang Yunlin Chen Zhiyi Wei 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第4期586-590,共5页
A convolutional neural network is employed to retrieve the time-domain envelop and phase of few-cycle femtosecond pulses from transient-grating frequency-resolved optical gating(TG-FROG) traces.We use theoretically ge... A convolutional neural network is employed to retrieve the time-domain envelop and phase of few-cycle femtosecond pulses from transient-grating frequency-resolved optical gating(TG-FROG) traces.We use theoretically generated TGFROG traces to complete supervised trainings of the convolutional neural networks,then use similarly generated traces not included in the training dataset to test how well the networks are trained.Accurate retrieval of such traces by the neural network is realized.In our case,we find that networks with exponential linear unit(ELU) activation function perform better than those with leaky rectified linear unit(LRELU) and scaled exponential linear unit(SELU).Finally,the issues that need to be addressed for the retrieval of experimental data by this method are discussed. 展开更多
关键词 transient-grating frequency-resolved optical gating convolutional neural network activation function phase retrieval algorithm
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Kerr-lens mode-locked polycrystalline Cr:ZnS femtosecond laser pumped by a monolithic Er:YAG laser 被引量:1
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作者 Chengfeng Hu jiangfeng zhu +7 位作者 Zhaohua Wang Xintong Sun Long Wei Weijun Ling Zhong Dong Qing Wang Chunqing Gao Zhiyi Wei 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第1期217-219,共3页
We demonstrated a Kerr-lens mode-locked polycrystalline Cr:ZnS laser pumped by a narrow-linewidth linearpolarised monolithic Er:YAG nonplanar ring oscillator operated at 1645 nm. With a 5-mm-thick sapphire plate for... We demonstrated a Kerr-lens mode-locked polycrystalline Cr:ZnS laser pumped by a narrow-linewidth linearpolarised monolithic Er:YAG nonplanar ring oscillator operated at 1645 nm. With a 5-mm-thick sapphire plate for intracavity dispersion compensation, a compact and stable Kerr-lens mode-locking operation was realised. The oscillator delivered 125-fs pulses at 2347 nm with an average power of 80 m W. Owing to the special polycrystalline structure of the Cr:ZnS crystal, the second to fourth harmonic generation was observed by random quasi-phase-matching. 展开更多
关键词 middle-infrared laser mode-locked laser polycrystalline Cr:ZnS
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All-fiber laser seeded femtosecond Yb:KGW solid state regenerative amplifier 被引量:1
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作者 Renchong Lv Hao Teng +3 位作者 Jiajun Song Renzhu Kang jiangfeng zhu Zhiyi Wei 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第9期242-247,共6页
A high efficiency compact Yb:KGW regenerative amplifier using an all-fiber laser seed source was comprehensively studied.With thermal lensing effect compensated by the cavity design,the compressed pulses with energy o... A high efficiency compact Yb:KGW regenerative amplifier using an all-fiber laser seed source was comprehensively studied.With thermal lensing effect compensated by the cavity design,the compressed pulses with energy of 1 mJ at 1 kHz and 0.4 mJ at 10 kHz in sub-400-fs pulse duration using chirped fiber Bragg grating(CFBG)stretcher were demonstrated.A modified Frantz-Nodvik equation was developed to emulate the dynamic behavior of the regenerative amplifier.The simulation results were in good agreement with the experiment.Numerical simulations and experimental results show that the scheme can be scalable to higher energy of multi-mJ,sub-300 fs pulses. 展开更多
关键词 regenerative amplifier ultrafast laser hybrid laser amplifier
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Diode-pumped Kerr-lens mode-locked Ti: sapphire laser with broad wavelength tunability
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作者 Han Liu Geyang Wang +6 位作者 Ke Yang Renzhu Kang Wenlong Tian Dacheng Zhang jiangfeng zhu Hainian Han Zhiyi Wei 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第9期232-236,共5页
We report a direct blue-diode-pumped wavelength tunable Kerr-lens mode-locked Ti: sapphire laser.Central wavelength tunability as broad as 89 nm(736-825 nm) is achieved by adjusting the insertion of the prism.Pulses a... We report a direct blue-diode-pumped wavelength tunable Kerr-lens mode-locked Ti: sapphire laser.Central wavelength tunability as broad as 89 nm(736-825 nm) is achieved by adjusting the insertion of the prism.Pulses as short as 17 fs are generated at a central wavelength of 736 nm with an average output power of 31 mW.The maximum output power is 46.8 mW at a central wavelength of 797 nm with a pulse duration of 46 fs. 展开更多
关键词 blue-diode pump Ti: sapphire WAVELENGTH tunable Kerr-lens MODE-LOCKED laser
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Using data-limited approaches to assess data-rich Indian Ocean bigeye tuna:Data quantity evaluation and critical information for management implications
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作者 Ya'nan Li jiangfeng zhu +2 位作者 Xiaojie Dai Dan Fu Yong Chen 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2022年第3期11-23,共13页
The majority of fishery stocks in the world are data limited,which limits formal stock assessments.Identifying the impacts of input data on stock assessment is critical for improving stock assessment and developing pr... The majority of fishery stocks in the world are data limited,which limits formal stock assessments.Identifying the impacts of input data on stock assessment is critical for improving stock assessment and developing precautionary management strategies.We compare catch advice obtained from applications of various datalimited methods(DLMs)with forecasted catch advice from existing data-rich stock assessment models for the Indian Ocean bigeye tuna(Thunnus obesus).Our goal was to evaluate the consistency of catch advice derived from data-rich methods and data-limited approaches when only a subset of data is available.The Stock Synthesis(SS)results were treated as benchmarks for comparison because they reflect the most comprehensive and best possible scientific information of the stock.This study indicated that although the DLMs examined appeared robust for the Indian Ocean bigeye tuna,the implied catch advice differed between data-limited approaches and the current assessment,due to different data inputs and model assumptions.Most DLMs tended to provide more optimistic catch advice compared with the SS,which was mostly influenced by historical catches,current abundance and depletion estimates,and natural mortality,but was less sensitive to life-history parameters(particularly those related to growth).This study highlights the utility of DLMs and their implications on catch advice for the management of tuna stocks. 展开更多
关键词 stock assessment bigeye tuna data-limited fisheries management Indian Ocean
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Simulating the impacts of fishing on central and eastern tropical Pacific ecosystem using multispecies size-spectrum model
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作者 Qinqin Lin Yuying Zhang jiangfeng zhu 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2022年第3期34-43,共10页
The size-spectrum model has been considered a useful tool for understanding the structures of marine ecosystems and examining management implications for fisheries.Based on Chinese tuna longline observer data from the... The size-spectrum model has been considered a useful tool for understanding the structures of marine ecosystems and examining management implications for fisheries.Based on Chinese tuna longline observer data from the central and eastern tropical Pacific Ocean and published data,we developed and calibrated a multispecies size-spectrum model of twenty common and commercially important species in this area.We then use the model to project the status of the species from 2016 to 2050 under five constant-fishing-mortality management scenarios:(1)F=0;(2)F=F_(recent),the average fishing mortality from 2013 to 2015;(3)F=0.5F_(recent);(4)F=2F_(recent) and(5)F=3F_(recent).Several ecological indicators were used to track the dynamics of the community structure under different levels of fishing,including the mean body weight,slope of community size spectra(Slope),and total biomass.The validation demonstrated that size-at-age data of nine main catch species between our model predictions and those empirical data from assessments by the Western and Central Pacific Fisheries Commission matched well,with the R^(2)>0.9.The direct effect of fishing was the decreasing abundance of large-sized individuals.The mean body weight in the community decreased by~1500 g(21%)by 2050 when F doubled from F_(recent) to 2F_(recent).The higher the fishing mortality,the steeper the Slope was.The projection also indicated that fishing impacts reflected by the total biomass did not increase proportionally with the increasing fishing mortality.The biomass of the main target tuna species was still abundant over the projection period under the recent fishing mortality,except Albacore tuna(Thunnus alalunga).For sharks and billfishes,their biomass remained at relatively higher levels only under the F=0 scenario.The results can serve as a scientific reference for alternative management strategies in the tropical Pacific Ocean. 展开更多
关键词 tropical Pacific size-spectrum model ECOSYSTEM fishing effect
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A 515-nm laser-pumped idler-resonant femtosecond BiB_(3)O_(6) optical parametric oscillator
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作者 Jinfang Yang Zhaohua Wang +4 位作者 Jiajun Song Renchong Lv Xianzhi Wang jiangfeng zhu Zhiyi Wei 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第1期339-343,共5页
We report on an idler-resonant femtosecond optical parametrical oscillator(OPO)based on BiB_(3)O_(6)(BiBO)crystal,synchronously pumped by a frequency-doubled,mode-locked Yb:KGW laser at 515 nm.The idler wavelengths of... We report on an idler-resonant femtosecond optical parametrical oscillator(OPO)based on BiB_(3)O_(6)(BiBO)crystal,synchronously pumped by a frequency-doubled,mode-locked Yb:KGW laser at 515 nm.The idler wavelengths of OPO can be tuned from 1100 nm to 1540 nm.At a repetition rate of 75.5 MHz,the OPO generates as much as 400 mW of idler power with 3.1 W of pump power,the corresponding pulse duration is 80 fs,which is 1.04 times of Fourier transform-limited(FTL)pulse duration at 1305 nm.In addition,the OPO exhibits excellent beam quality with M^(2)<1.8 at 1150 nm.To the best of our knowledge,this is the first idler-resonant femtosecond OPO pumped by 515 nm. 展开更多
关键词 nonlinear frequency conversion 515-nm laser pumped femtosecond optical parametric oscillator BiB_(3)O_(6)nonlinear crystal
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Study on the catch,bycatch and discard of Chinese pelagic longline fisheries in the Atlantic Ocean
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作者 Boyi Pan jiangfeng zhu +3 位作者 Qinqin Lin Zhe Geng Feng Wu Yuying Zhang 《Aquaculture and Fisheries》 CSCD 2024年第2期280-286,共7页
Catch,bycatch and discard information is important for the assessment and management of fisheries.Using Chinese pelagic tuna longline observer data from 2010 to 2018,we studied the catch composition in the Chinese pel... Catch,bycatch and discard information is important for the assessment and management of fisheries.Using Chinese pelagic tuna longline observer data from 2010 to 2018,we studied the catch composition in the Chinese pelagic tuna longline fisheries in Atlantic targeting bigeye tuna(Thunnus obesus)and bluefin tuna(Thunnus thynnus),and analyzed the survival status and discard rates of common bycatch species.A total of 55 species,including tunas,billfishes,sharks,sea turtles,cetaceans,seabirds,and other pelagic species,were observed.The results indicated that the catch composition of the Chinese pelagic tuna longline fishery targeting bigeye tuna was significantly different from that targeting bluefin tuna.The annual discard rates of common species decreased over this period.Discard rate by length and discard mortality for common species were varied among species.This is the first study to estimate catch,bycatch,and discard using Chinese pelagic tuna longline observer data in the Atlantic Ocean,which is important for the management of Chinese tuna longline fisheries in Atlantic Ocean. 展开更多
关键词 Longline fishery Catch composition DISCARD Size distribution Atlantic
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Spatial variation in bigeye tuna Thunnus obesus size at sexual maturity in the eastern Pacific Ocean 被引量:1
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作者 Hongji Huang Cheng Zhou +3 位作者 Liuxiong Xu jiangfeng zhu Xuefang Wang Jie Cao 《Aquaculture and Fisheries》 CSCD 2023年第5期572-578,共7页
Understanding the reproductive characteristics of a species is of crucial for accurate stock assessment and management plans to ensure sustainable fisheries.In this study,the size at 50%sexual maturity(L50)parameters ... Understanding the reproductive characteristics of a species is of crucial for accurate stock assessment and management plans to ensure sustainable fisheries.In this study,the size at 50%sexual maturity(L50)parameters in different bio-ecological provinces were estimated for bigeye tuna,Thunnus obesus,sampled from the Eastern Pacific Ocean tuna fisheries-dependent survey from 2013 to 2019.The overall sex ratio of the catch during the sampling differed significantly from 1:1.Bigeye tuna exhibit sexual dimorphism in the growth of males and females,with a clear shift in predominance from female to male with increasing sizes.In the North Pacific Sub-tropical Gyre(east)(NPST-east),North Pacific Tropical Gyre(NPTG),Pacific North Equatorial Countercurrent(PNEC),and Pacific Equatorial Divergence(PEQD),females(meals)reached sexual maturity round 102 cm(106 cm),106 cm(100 cm),125 cm(110 cm),and 113 cm(110 cm),respectively,the estimated L50 of bigeye tuna was 124.08 cm,121.97 cm,139.92 cm and 132.45 cm,respectively.The degree of populations mixing between equatorial(PNEC and PEQD)and high-latitude regions(NPST-east and NPTG)is extremely small,but it is reasonably high between the NPST-east and NPTG or PNEC and PEQD.These parameters were significantly different,suggesting the occurrence of a spatial difference in the size-at-maturity of bigeye tuna between these bio-ecological provinces.The findings of this study provide the key information for understanding the life history of bigeye tuna in the Eastern Pacific Ocean and will contribute to the conservation and sustainable yield of this species. 展开更多
关键词 Eastern Pacific ocean Bigeye tuna Sexual maturity Mixed-effects model
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高重复频率高次谐波驱动源技术 被引量:3
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作者 王阁阳 吕仁冲 +6 位作者 许思源 刘寒 田文龙 张大成 赵昆 朱江峰 魏志义 《科学通报》 EI CAS CSCD 北大核心 2021年第8期924-939,共16页
超快驱动光源技术的不断进步激发了极紫外阿秒脉冲在原子分子的精密光谱学及超快动力学研究中的巨大潜力.本文回顾了高重复频率飞秒激光驱动高次谐波产生的发展历程,并以高重复频率极紫外光源的应用为切入点梳理了钛宝石激光系统、掺镱... 超快驱动光源技术的不断进步激发了极紫外阿秒脉冲在原子分子的精密光谱学及超快动力学研究中的巨大潜力.本文回顾了高重复频率飞秒激光驱动高次谐波产生的发展历程,并以高重复频率极紫外光源的应用为切入点梳理了钛宝石激光系统、掺镱光纤激光系统以及掺镱全固态激光系统等驱动光源的参数特点、适用范围以及发展趋势等.最后,提出了用以驱动兆赫兹量级重复频率高次谐波产生的紧凑型全固态放大方案. 展开更多
关键词 高重复频率 高次谐波产生 阿秒脉冲 飞秒激光
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阿秒脉冲测量原理和技术研究进展 被引量:3
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作者 赵昆 高亦谈 +8 位作者 朱孝先 许思源 江昱佼 李远锋 王佶 朱江峰 张大成 陈云琳 魏志义 《科学通报》 EI CAS CSCD 北大核心 2021年第8期835-846,共12页
阿秒脉冲由于极短的脉冲宽度和超高的时间分辨能力,在物理学、化学、生物学和医学等领域有着潜在应用.自诞生之日起,阿秒脉冲的时域极限不断突破,使得阿秒脉冲的测量成为一大研究热点.本文主要分为两个部分,第一部分回顾了阿秒脉冲与气... 阿秒脉冲由于极短的脉冲宽度和超高的时间分辨能力,在物理学、化学、生物学和医学等领域有着潜在应用.自诞生之日起,阿秒脉冲的时域极限不断突破,使得阿秒脉冲的测量成为一大研究热点.本文主要分为两个部分,第一部分回顾了阿秒脉冲与气体介质作用的脉冲测量技术的发展过程,简述了几种测量阿秒脉冲时域信息的实验原理、实验方案设计以及实验结果.第二部分介绍了从阿秒条纹相机中提取阿秒脉冲时域信息的理论反演算法,包括算法的原理和结构,并从计算时间和计算结果精度上对算法进行了比较.文章最后总结了阿秒脉冲测量技术在实验和理论上的困难与挑战,并展望了未来阿秒脉冲测量的发展方向. 展开更多
关键词 阿秒脉冲测量 阿秒条纹相机 阿秒条纹相机反演算法 光电离
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Generation of 33 fs pulses directly from a Kerr-lens mode-locked Yb:CaYAlO4 laser 被引量:8
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作者 Ziye Gao jiangfeng zhu +5 位作者 Junli Wang Zhiyi Wei Xiaodong Xu Lihe Zheng Liangbi Su Jun Xu 《Photonics Research》 SCIE EI 2015年第6期335-338,共4页
We experimentally demonstrated a diode-pumped Kerr-lens mode-locked femtosecond laser with a Yb:CaYAlO4 crystal as the gain medium. Pulse duration as short as 33 fs was obtained directly from the oscillator at a repet... We experimentally demonstrated a diode-pumped Kerr-lens mode-locked femtosecond laser with a Yb:CaYAlO4 crystal as the gain medium. Pulse duration as short as 33 fs was obtained directly from the oscillator at a repetition rate of 115 MHz. The central wavelength was at 1059 nm with a spectral bandwidth of 49 nm. These are, to the bestof our knowledge, the shortest pulses generated from a Yb:CaYAlO4 oscillator. 展开更多
关键词 mode CYA YB Generation of 33 fs pulses directly from a Kerr-lens mode-locked Yb:CaYAlO4 laser
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Diode-pumped power scalable Kerr-lens mode-locked Yb:CYA laser 被引量:9
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作者 WENLONG TIAN YINGNAN PENG +4 位作者 ZIYUE ZHANG ZIJIAO YU jiangfeng zhu XIAODONG XU ZHIYI WEI 《Photonics Research》 SCIE EI 2018年第2期127-131,共5页
Stable 68 fs pulses with the average power of 1.5 W is directly generated from a multimode diode-pumped Kerr-lens mode-locked Yb:CYA laser by separating the gain medium and Kerr medium. The repetition rate is about 50... Stable 68 fs pulses with the average power of 1.5 W is directly generated from a multimode diode-pumped Kerr-lens mode-locked Yb:CYA laser by separating the gain medium and Kerr medium. The repetition rate is about 50 MHz, resulting in a single pulse energy of 30 n J and a peak power of 0.44 MW. To the best of our knowledge, this is the highest single pulse energy ever produced from a mode-locked Yb:CYA oscillator. Our experimental results show that Yb:CYA crystal is an excellent candidate for multiwatt, sub-100 fs pulse generation in diode-pumped all-solid-state lasers. It is believed that the output power can be scalable to multi-W while the pulse duration is maintained with this simple method. 展开更多
关键词 (140.4050) Mode-locked lasers (140.3615) Lasers ytterbium (140.3580) Lasers solid-state.
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Sub-10-fs pulse generation from a blue laser-diode-pumped Ti:sapphire oscillator 被引量:6
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作者 Han Liu Geyang Wang +6 位作者 Jianwang Jiang Wenlong Tian Dacheng Zhang Hainian Han Shaobo Fang jiangfeng zhu Zhiyi Wei 《Chinese Optics Letters》 SCIE EI CAS CSCD 2020年第7期60-63,共4页
Pulses as short as 8.1 fs were generated from a blue laser-diode-pumped Kerr-lens mode-locked Ti:sapphire oscillator, with an average power of 27 m W and a repetition rate of 120.6 MHz. The full width at half-maximum ... Pulses as short as 8.1 fs were generated from a blue laser-diode-pumped Kerr-lens mode-locked Ti:sapphire oscillator, with an average power of 27 m W and a repetition rate of 120.6 MHz. The full width at half-maximum exceeds 146 nm, benefitting from the dispersion management by a combination of a low-dispersion fused silica prism pair and a series of double-chirped mirrors. To the best of our knowledge, this is the first time to generate sub-10-fs pulses from a laser diode directly pumped Ti:sapphire oscillator. 展开更多
关键词 diode-pumped lasers TITANIUM mode-locked lasers
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Harmonically pump a femtosecond optical parametric oscillator to 1.13 GHz by a femtosecond 515 nm laser 被引量:3
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作者 Jiajun Song Xianghao Meng +6 位作者 Zhaohua Wang Xianzhi Wang Wenlong Tian jiangfeng zhu Shaobo Fang Hao Teng Zhiyi Wei 《Chinese Optics Letters》 SCIE EI CAS CSCD 2020年第3期57-61,共5页
We demonstrate a harmonically pumped femtosecond optical parametric oscillator(OPO)laser using a frequency-doubled mode-locked Yb:KGW laser at a repetition rate of 75.5 MHz as the pump laser.Based on a bismuth borate ... We demonstrate a harmonically pumped femtosecond optical parametric oscillator(OPO)laser using a frequency-doubled mode-locked Yb:KGW laser at a repetition rate of 75.5 MHz as the pump laser.Based on a bismuth borate nonlinear crystal,repetition rates up to 1.13 GHz are realized,which is 15 times that of the pump laser.The signal wavelength is tunable from 700 nm to 887 nm.The maximum power of the signal is 207 m W at the central wavelength of 750 nm and the shortest pulse duration is 117 fs at 780 nm.The beam quality(M^2 factor)in the horizontal and vertical directions of the output beam are 1.077 and 1.141,respectively. 展开更多
关键词 GHZ FEMTOSECOND LASER optical parametric OSCILLATOR tunable wavelength
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Sub-40-fs high-power Yb:CALYO laser pumped by single-mode fiber laser 被引量:2
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作者 Wenlong Tian Geyang Wang +5 位作者 Dacheng Zhang jiangfeng zhu Zhaohua Wang Xiaodong Xu Jun Xu Zhiyi Wei 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2019年第4期45-49,共5页
We report on the study of single-mode fiber-laser-pumped mode-locked Yb:CALYO lasers via using a passive saturable absorber and Kerr-lens mode-locking technique,respectively.Up to 3.1-W average power with 103-fs pulse... We report on the study of single-mode fiber-laser-pumped mode-locked Yb:CALYO lasers via using a passive saturable absorber and Kerr-lens mode-locking technique,respectively.Up to 3.1-W average power with 103-fs pulse duration is obtained from the passive mode-locking,and down to 36-fs pulse duration with more than 2-W average power is achieved by the pure Kerr-lens mode-locking,which is to the best of our knowledge,the highest average power from a reported sub-40-fs Yb-based solid-state oscillator. 展开更多
关键词 fiber pump high power solid-state laser sub-40-fs Yb:CALYO
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