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Experimental Observation of Bright and Dark Solitons mode-Locked with Zirconia-Based Erbium-Doped Fiber Laser

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chinese Physics Letters 2018年第2期35卷 25-28页

作者： A.m.markom S.J.Tan H.Haris m.c.paul A.Dhar S.Das S.W.Harun Faculty of Electrical Engineering Universiti Teknologi MARAMasai 81750Malaysia School of Engineering KDU University CollegeUtropolis GlenmarieShah Alam 40150Malaysia Department of Electrical Engineering University of MalayaKuala Lumpur 50603Malaysia Fiber Optics and Photonics Division CSIR-Central Glass and Ceramic Research InstituteKolkata 700032India

We demonstrate the generation of dark and bright solitons with our homemade zirconia-based erbium-doped fiber and graphene oxide（GO） saturable absorber in anomalous dispersion *** GO is fabricated using an abridged Hummer＇s method,which is combined with polyethylene oxide to produce a composite *** film is sandwiched between two optical ferrules and embedded in the laser cavity to enhance its birefringence and *** self-starting bright soliton is easily generated at pump power of 78 mW with the whole length cavity of 14.7 *** laser produces the bright pulse train with repetition rate,pulse width,pulse energy and central wavelength being 13.9 mHz,0.6 ps,2.74 p J and 1577.46 nm,***,by adding the 10 m of single mode fiber into the laser cavity,dark soliton pulse is *** the formation of dark pulse train,the measured repetition rate,pulse width,pulse energy and central wavelength are 8.3 mHz,20 ns and 4.98 p J and1596.82 nm,*** pulses operate in the anomalous region.

关键词： Zr EDF Experimental Observation of Bright and Dark Solitons mode-Locked with Zirconia-Based Erbium-Doped Fiber Laser

mode-locked 2 μm fiber laser with a multi-walled carbon nanotube as a saturable absorber

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chinese Optics Letters 2015年第3期13卷 10-13页

作者： S.m.Azooz F.Ahmad H.Ahmad S.W.Harun B.A.Hamida S.Khan A.Halder m.c.paul m.Pal S.K.Bhadra Department of Electrical Engineering Faculty of Engineering University of Malaya Photonics Research center University of Malaya Department of Electrical and computer Engineering International Islamic University MalaysiaJalan Gombak Fiber Optics and Photonics Division Central Glass & Ceramic Research InstituteCSIR

We propose and demonstrate a passively mode-locked fiber laser operating at 1951.8 nm using a commercial thulium-doped fiber （TDF） laser, a homemade double-clad thulium-ytterbium co-doped fiber （TYDF） as the gain media, and a multi-walled carbon nanotube （mWcNT） based saturable absorber （SA）. We prepare the mWcNT composite by mixing a homogeneous solution of mWcNTs with a diluted polyvinyl alcohol （PVA） polymer solution and then drying it at room temperature to form a film. The film is placed between two fiber connectors as a SA before it is integrated into a laser ring cavity. The cavity consists of a 2 m long TDF pumped by a 800 nm laser diode and a 15 m long homemade TYDF pumped by a 905 nm multimode laser diode. A stable mode-locking pulse with a repetition rate of 34.6 mHz and a pulse width of 10.79 ps is obtained when the 905 nm multimode pump power reaches 1.8-2.2 W, while the single-mode 800 nm pump power is fixed at 141.5 mW at all times. To the best of our knowledge, this is the first reported mode-locked fiber laser using a mWcNT-based SA.

关键词： mWcNTs mode mode-locked 2 m fiber laser with a multi-walled carbon nanotube as a saturable absorber

A Tm-Bi co-Doped Fiber Laser with Dual Pumping Operation

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chinese Physics Letters 2013年第3期30卷 71-74页

作者： N.Saidin S.W.Harun S.S.A.Damanhuri S.m.m.Ali H.Ahmad A.Halder m.c.paul S.Das m.Pal S.K.Bhadra Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia Photonics Research centre University of Malaya50603 Kuala LumpurMalaysia Fiber Optics and Photonics Division CSIR-Central Glass&Ceramic Research InstituteKolkataIndia

We demonstrate an efficient fiber laser operating at 1901.6 nm using a newly developed thulium bismuth co-doped fiber(TBF)with dual pumping at 792 nm and 1552 *** fiber was fabricated using modified chemical vapor deposition and solution doping *** dopant concentrations(wt%)and compositions inside the core are 0.15 Bi_(2)O_(3),0.3 Tm_(2)O_(3),1.0 Al_(2)O_(3) and 12.0 GeO_(2).The TBF laser operates at 1901.6 nm with a lasing efficiency of 33.2%and pump power threshold of 85 mW using a 2-m-long TBF in a linear cavity with two fiber Bragg gratings(FBGs).The high efficiency is attributed to the use of additional 1552 nm pump to complement 792 nm *** maximum output power of 225 mW is achieved at the pump power of 820 mW with the optimum length of 2 m.

关键词： pump fiber pumping

A Flat-Gain Double-Pass Amplifier with New Hafnia-Bismuth-Erbium codoped Fiber

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chinese Physics Letters 2018年第5期35卷 52-55页

作者： Alabbas A.Al-Azzawi Aya A.Almukhtar P.H.Reddy D.Dutta S.Das A.Dhar m.c.paul U.N.Zakaria S.W.Harun Photonics Engineering Laboratory Department of Electrical Engineering University of Malaya Department of computer Techniques Engineering Al-Esra'a University College Fiber Optics and Photonics Division CSIR-Central Glass and Ceramic Research Institute Academy of Scientific and Innovative Research CSIR-CGCRI Campus

An efficient and compact double-pass optical fiber amplifier is demonstrated using a newly developed hafnia bismuth erbium co-doped fiber（HBEDF） as a gain medium. The HBEDF is fabricated using a modified chemical vapor deposition in conjunction with solution doping. The fiber has an erbium ion concentration of 12500 *** the optimum length of 0.5 m, the HBEDF amplifier（HBEDFA） achieves a flat gain of 26 d B with a gain variation of less than 1.5 d B within a wavelength region from 1530 to 1560 nm when the input signal and pump power are fixed at-30 d Bm and 140 m W, respectively. On the other hand, at the input signal power of-10 d Bm,the HBEDFA also achieves a flat gain of 14.2 d B with a gain variation of less than 2.5 d B within a wide wavelength region from 1525 to 1570 nm. compared with the conventional zirconia erbium co-doped fiber based amplifier,the proposed HBEDFA obtains a more efficient gain and lower noise figure. For an input signal of-30 d Bm, the gain improvements of 6.2 d B and 4.8 d B are obtained at 1525 nm and 1540 nm, respectively.

关键词： length A Flat-Gain Double-Pass Amplifier with New Hafnia-Bismuth-Erbium codoped Fiber

Self-starting harmonic mode-locked Tm-Bi co-doped germanate f iber laser with carbon nanotube-based saturable absorber

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chinese Optics Letters 2013年第6期11卷 81-83页

作者： N.Saidin D.I.m.Zen S.S.A.Damanhuri S.W.Harun H.Ahmad F.Ahmad K.Dimyati A.Halder m.c.paul m.Pal S.K.Bhadra Photonics Research centre University of Malaya50603 Kuala LumpurMalaysia Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya50603 Kuala LumpurMalaysia Department of Electrical and Electronic Engineering National Defense University of MalaysiaKem Sungai Besi57000 Kuala LumpurMalaysia Fiber Optics and Photonics Division Central Glass and Ceramic Research InstituteCSIRKolkataIndia

We report a ring cavity passively harmonic mode-locked fiber laser using a newly developed thulium- bismuth co-doped fiber （TBF） as a gain medium in conjunction with a carbon nanotube （cNT）-based saturable absorber. The TBF laser generates a third harmonic mode-locked soliton pulse train with a high repetition rate of 50 mHz and a pulse duration of 1.86 ps. The laser operates at 1 901.6 nm with an average power of 6.6 mW, corresponding to a pulse energy of 0.132 nJ, at a 1 552 nm pump power of 723.3 roW.

关键词： mode Self-starting harmonic mode-locked Tm-Bi co-doped germanate f iber laser with carbon nanotube-based saturable absorber cNT Tm Bi

Evidence supporting the relationship between maternal asthma and risk for autism spectrum disorders

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Neural Regeneration Research 2025年第4期20卷 1101-1102页

作者： Hadley Osman paul Ashwood Department of medical microbiology and Immunology and the M.I.N.D.InstituteUniversity of California at DavisSacramentoCAUSA

During pregnancy,maternal immune activation(mIA),due to infection,chronic inflammatory disorders,or toxic exposures,can result in lasting health impacts on the developing *** has been associated with an increased risk of neurodevelopmental disorders,such as autism spectrum disorder(ASD)in the *** is characterized by increased repetitive and stereotyped behaviors and decreased *** of 2020,1 in 36 children are diagnosed with ASD by the age of 8 years,with ASD rates continuing to increase in prevalence in USA(Tamayo et al.,2023).Post-mortem brain studies,biomarker and transcriptomic studies,and epidemiology studies have provided compelling evidence of immune dysregulation in the circulation and brain of individuals diagnosed with ***,the etiology of ASD is largely unknown,however,genetic components and environmental factors can contribute to increased *** allergic asthma(mAA),a form of mIA,has been identified as a potential risk factor for developing neurodevelopmental disorders(Patel et al.,2020).Asthma is a chronic inflammatory condition driven by a T-helper type(TH)2 immune response.

关键词： disorders epidemiology fetus

Neurogenesis dynamics in the olfactory bulb:deciphering circuitry organization, function, and adaptive plasticity

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Neural Regeneration Research 2025年第6期20卷 1565-1581页

作者： moawiah m.Naffaa Department of Psychology and Neuroscience Duke UniversityDurhamNCUSA Department of cell Biology Duke University School of MedicineDurhamNCUSA

Adult neurogenesis persists after birth in the subventricular zone, with new neurons migrating to the granule cell layer and glomerular layers of the olfactory bulb, where they integrate into existing circuitry as inhibitory interneurons. The generation of these new neurons in the olfactory bulb supports both structural and functional plasticity, aiding in circuit remodeling triggered by memory and learning processes. However, the presence of these neurons, coupled with the cellular diversity within the olfactory bulb, presents an ongoing challenge in understanding its network organization and function. moreover,the continuous integration of new neurons in the olfactory bulb plays a pivotal role in regulating olfactory information processing. This adaptive process responds to changes in epithelial composition and contributes to the formation of olfactory memories by modulating cellular connectivity within the olfactory bulb and interacting intricately with higher-order brain regions. The role of adult neurogenesis in olfactory bulb functions remains a topic of debate. Nevertheless, the functionality of the olfactory bulb is intricately linked to the organization of granule cells around mitral and tufted cells. This organizational pattern significantly impacts output, network behavior, and synaptic plasticity, which are crucial for olfactory perception and memory. Additionally, this organization is further shaped by axon terminals originating from cortical and subcortical regions. Despite the crucial role of olfactory bulb in brain functions and behaviors related to olfaction, these complex and highly interconnected processes have not been comprehensively studied as a whole. Therefore, this manuscript aims to discuss our current understanding and explore how neural plasticity and olfactory neurogenesis contribute to enhancing the adaptability of the olfactory system. These mechanisms are thought to support olfactory learning and memory, potentially through increased

关键词： network adaptability neurogenesis neuronal communication olfactory bulb olfactory learning olfactory memory synaptic plasticity

mitochondria–cGAS–STING axis is a potential therapeutic target for senescence-dependent inflammaging-associated neurodegeneration

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Neural Regeneration Research 2025年第3期20卷 805-807页

作者： Josém.Izquierdo centro de Biología molecular Severo Ochoa(cBm) Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid(CSIC-UAM)MadridSpain

The word “senescence” comes from the Latin senescens, meaning “to begin to age”, and is characterized by a long-lasting but reversible block in proliferation, resulting from stress-induced cell cycle arrest of pre... 详细信息

关键词： Latin potential lasting

Brain-penetrating neurotrophic factor mimetics: HER-096 as a disease-modifying therapy for Parkinson’s disease

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Neural Regeneration Research 2025年第4期20卷 1094-1095页

作者： Natalia Kulesskaya Kira m.Holmström Henri J.Huttunen Herantis Pharma Plc EspooFinland

Neurotrophic factors as a therapeutic approach in neurodegenerative diseases:A major unmet need in the field of central nervous system diseases is disease-modifying *** for decades there have been various symptomatic treatments available to alleviate the symptoms of the disease,disease-modification,*** that stop,significantly delay,or reverse the progression of the disease,has been turned out to a difficult goal to achieve.

关键词： diseases treatment therapeutic