检索结果-南通市图书馆

Graphene-decorated microfiber knot as a broadband resonator for ultrahigh-repetition-rate pulse fiber lasers

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2018年第10期6卷 I0003-I0009页

作者： MENG Liu RUI TANG AI-PING luo WEN-CHENG Xu zhi-chao luo Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices & Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications South China Normal University Guangzhou 510006 China Guangdong Provincial Engineenng Technology Research Center for Microstructured Functional Fibers and Devices South China Normal University Guangzhou 510006 China

Searching for an ultrahigh-repetition-rate pulse on the order of hundreds of gigahertz(GHz) is still a challenging task in the ultrafast laser community. Recently, high-quality silicon/silica-based resonators were exploited to generate a high-repetition-rate pulse based on the filter-driven four-wave mixing effect in fiber lasers. However,despite their great performance, the silicon/silica-based resonators still have some drawbacks, such as single waveband operation and low coupling efficiency between the fiber and resonators. To overcome these drawbacks,herein we proposed an all-fiber broadband resonator fabricated by depositing the graphene onto a microfiber knot. As a proof-of-concept experiment, the graphene-deposited broadband microfiber knot resonator(MKR)was applied to Er-and Yb-doped fiber lasers operating at two different wavebands, respectively, to efficiently generate hundreds-of-GHz-repetition-rate pulses. Such a graphene-deposited broadband MKR could open some new applications in ultrafast laser technology, broadband optical frequency comb generation, and other related fields of photonics.

关键词：重复频率脉冲激光技术发展现状通讯技术

Generation and manipulation of bright spatial bound-soliton pairs under the diffusion effect in photovoltaic photorefractive crystals

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第10期29卷 282-288页

作者： Ze-Xian Zhang Xiao-Yang Zhao Ye Li Hu Cui zhi-chao luo Wen-Cheng Xu Ai-Ping luo Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices&Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications South China Normal UniversityGuangzhou 510006China

The generation and propagation characteristics of bright spatial bound-soliton pairs (BSPs) are investigated under the diffusion effect in photovoltaic photorefractive crystals by numerical simulation. The results show that two coherent solitons, one as the signal light and the other as the control light, can form a BSP when the peak intensity of the control light is appropriately selected. Moreover, under the diffusion effect, the BSP experiences a self-bending process during propagating and the center of the BSP moves on a parabolic trajectory. Furthermore, the lateral shift of the BSP at the output face of the crystal can be manipulated by adjusting the peak intensity of the control light. The research results provide a method for the design of all-optical switching and routing based on the manipulation of the lateral position of BSPs.

关键词： solitons photovoltaic photorefractive diffusion effect

The protective effects and underlying mechanisms of dapagliflozin on diabetes-induced testicular dysfunction

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2023年第3期25卷 331-338页

作者： zhi-chao luo Zi-Run Jin Ya-Fei Jiang Tian-Jiao Wei Ya-Lei Cao Zhe Zhang Rui Wei Hui Jiang Department of Urology Peking University Third HospitalBeijing 100191China Department of Endocrinology and Metabolism Peking University Third HospitalBeijing 100191China Department of Reproductive Medicine Center Peking University Third HospitalBeijing 100191China

Male diabetic individuals present a marked impairment in fertility;however,knowledge regarding the pathogenic mechanisms and therapeutic strategies is *** new hypoglycemic drug dapagliflozin has shown certain benefits,such as decreasing the risk of cardiovascular and renal events in patients with *** so,until now,the effects and underlying mechanisms of dapagliflozin on diabetic male infertility have awaited ***,we found that dapagliflozin lowered blood glucose levels,alleviated seminiferous tubule destruction,and increased sperm concentrations and motility in leptin receptor-deficient diabetic db/db ***,the glucagon-like peptide-1 receptor(GLP-1R)antagonist exendin(9-39)had no effect on glucose levels but reversed the protective effects of dapagliflozin on testicular structure and sperm quality in db/db *** also found that dapagliflozin inhibited the testicular apoptotic process by upregulating the expression of the antiapoptotic protein B-cell lymphoma 2(BCL2)and X-linked inhibitor of apoptosis protein(XIAP)and inhibiting oxidative stress by enhancing the antioxidant status,including total antioxidant capacity,total superoxide dismutase(SOD)activity,and glutathione peroxidase(GPx)activity,as well as decreasing the level of 4-hydroxynonenal(4-HNE).Exendin(9-39)administration partially reversed these ***,dapagliflozin upregulated the glucagon-like peptide-1(GLP-1)level in plasma and GLP-1R expression by promoting AKT8 virus oncogene cellular homolog(Akt)phosphorylation in testicular ***(9-39)partially inhibited Akt *** results suggest that dapagliflozin protects against diabetes-induced spermatogenic dysfunction via activation of the GLP-1R/phosphatidylinositol 3-kinase(PI3K)/Akt signaling *** results indicate the potential effects of dapagliflozin against diabetes-induced spermatogenic dysfunction.

关键词： dapagliflozin diabetes glucagon-like peptide-1 receptor male infertility oxidative stress

Q-switched mode-locked multimode fiber laser based on a graphene-deposited multimode microfiber

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2021年第12期19卷 32-38页

作者： Jia-Wen Wu Yu-Xin Gao Xu-Bin Lin Jin-Gan Long Hu Cui zhi-chao luo Wen-Cheng Xu Ai-Ping luo Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices South China Normal UniversityGuangzhou 510006China Department of Mechanical and Electrical Engineering Shandong Polytechnic CollegeJining 272067China

We report Q-switched mode-locked(QML)pulses generation in an Yb-doped multimode fiber(MMF)laser by using a graphene-deposited multimode microfiber(GMM)for the first time,to the best of our *** single-wavelength QML operation with the central wavelength tunable from 1028.81 nm to 1039.20 nm and the dual-wavelength QML operation with the wavelength spacing tunable from 0.93 nm to 5.79 nm are achieved due to the multimode interference filtering effect induced by the few-mode fiber and MMF structure and the GMM in the ***,in the single-wavelength QML operation,the fifth harmonic is also realized owing to the high nonlinear effect of the *** obtained results indicate that the QML pulses can be generated in the MMF laser,and such a flexible tunable laser has promising applications in optical sensing,measuring,and laser processing.

关键词： Q-switched mode-locked pulse graphene-deposited multimode microfiber multimode fiber laser

“Periodic”soliton explosions in a dual-wavelength mode-locked Yb-doped fiber laser

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2020年第3期8卷 246-251页

作者： MENG LIU TI-JIAN LI AI-PING luo WEN-CHENG XU zhi-chao luo Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications&Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices South ChinaNormal UniversityGuangzhou 510006China

We report the"periodic"soliton explosions induced by intracavity soliton collisions in a dual-wavelength modelocked Yb-doped fiber *** to the different group velocities of the two wavelengths,the mode-locked solitons centered at different wavelengths would periodically collide with each *** using the dispersive Fourier transformation technique,it was found that each collision would induce soliton explosions,but none of them would be ***,this phenomenon was termed as"periodic"soliton *** addition,the dissipative rogue waves were detected in the dual-wavelength mode-locked *** experimental results would be fruitful to the communities interested in soliton dynamics and dual-comb lasers.

关键词： fiber soliton mode

Few-layer MoS2-deposited microfiber as highly nonlinear photonic device for pulse shaping in a fiber laser [Invited]

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2015年第2期3卷 69-78页

作者： Ai-Ping luo Meng Liu Xu-De Wang Qiu-Yi Ning Wen-Cheng Xu zhi-chao luo Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and Engineering South China Normal University

Two-dimensional（2D） materials have emerged as attractive mediums for fabricating versatile optoelectronic devices. Recently, few-layer molybdenum disulfide（MoS2）, as a shining 2D material, has been discovered to possess both the saturable absorption effect and large nonlinear refractive index. Herein, taking advantage of the unique nonlinear optical properties of MoS2, we fabricated a highly nonlinear saturable absorption photonic device by depositing the few-layer MoS2 onto the microfiber. With the proposed MoS2 photonic device, apart from the conventional soliton patterns, the mode-locked pulses could be shaped into some new soliton patterns, namely,multiple soliton molecules, localized chaotic multipulses, and double-scale soliton clusters. Our findings indicate that the few-layer MoS2-deposited microfiber could operate as a promising highlynonlinear photonic device for the related nonlinear optics applications.

关键词： high Mo mode Few-layer MoS2-deposited microfiber as highly nonlinear photonic device for pulse shaping in a fiber laser

1.7-μm dissipative soliton Tm-doped fiber laser

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2021年第5期9卷 873-878页

作者： JI-XIANG CHEN XIANG-YUE LI TI-JIAN LI ZE-YU ZHAN MENG LIU CAN LI AI-PING luo PU ZHOU KENNETH K-YWONG WEN-CHENG XU zhi-chao luo Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices&Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications South China Normal UniversityGuangzhou 510006China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina

We report on the dissipative soliton generation in a 1.7-μm net-normal dispersion Tm-doped fiber laser by nonlinear polarization rotation technique. An intra-cavity bandpass filter was employed to suppress the longwavelength emission, while the cavity dispersion was compensated by a segment of ultrahigh numerical aperture(UHNA4) fiber. The dissipative soliton with a central wavelength of 1746 nm was obtained, covering a spectral range from 1737 nm to 1754 nm. The de-chirped duration and energy of the dissipative soliton were 370 fs and 0.2 nJ, respectively. In addition, the dynamics of multiple dissipative solitons were also investigated. Through optimization of the cavity dispersion, the 50 nm broadband dissipative soliton with de-chirped pulse duration of 230 fs could be achieved. The development of dissipative soliton seed laser represents the first step in achieving the chirped pulse amplification system at the 1.7-μm wave band, which would find potential applications in fields such as biomedical imaging and material processing.

关键词： technique. soliton dissipative

Exploring practical methods for detecting k-nonseparability in multipartite quantum states

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 255-256页

作者： Shunlong luo Academy of Mathematics and Systems Science Chinese Academy of Sciences

Quantum entanglement, referred to as “spooky action at a distance” by Einstein, is not only an intriguing and fascinating feature of quantum theory challenging our classical intuitions about locality and correlations, but also has practical and profound implications for quantum technologies. Initially described by Einstein, Podolsky and Rosen, as well as by Schro¨dinger, entanglement now has become a basic and crucial ingredient for both foundational and experimental investigations of the quantum world.

关键词：

Primary parenchymal squamous cell carcinoma of the kidney:A case report

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第4期13卷 34-40页

作者： zhi-Hui Zheng Bo Shao chao-Min Xu Ke Wang Jia-Zhu Wen Li-Kang luo Jia-Cheng Guan Department of Ultrasound The Second People’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina Department of Radiology Shulan(Quzhou)HospitalQuzhou 324000Zhejiang ProvinceChina Department of Radiology The Second People’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina Department of Pathology The Second people’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina

BACKGROUND Primary squamous cell carcinoma(SCC)of the renal parenchyma is extremely rare,with only nine cases *** SUMMARY This study reports a 51-year-old man with primary SCC of the renal *** patient was admitted with recurrent dull pain and discomfort in the right lumbar region,which had worsened over 2 weeks,accompanied by painful gross *** antigen(SCCA)levels were elevated,and imaging revealed a renal mass with associated *** patient underwent laparoscopic unilateral nephrectomy and lymph node *** pathology confirmed highly differentiated SCC with necrosis in the right renal parenchyma,with negative renal pelvis and *** pathological stage was *** months after surgery,the tumor recurred with involvement of the liver,right psoas major muscle,and inferior vena *** patient refused chemotherapy and succumbed to the disease 6 months postoperatively due to disease *** We report a case of primary SCC of the renal parenchyma,a rare renal *** clinical symptoms,laboratory tests,and imaging findings are nonspecific,making accurate and timely diagnosis *** to the literature,for patients with renal calculi accompanied by a renal mass,elevated serum SCCA levels,and magnetic resonance imaging showing cystic or cystic-solid masses within the kidney with pseudocapsules and heterogeneous mild enhancement,the possibility of this disease should be considered.

关键词： Renal tumor Renal parenchyma Squamous cell carcinoma Renal calculi Computed tomography Case report