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VO_(x)/NaVO_(3) nanocomposite as a novel saturable absorber for passive Q-switching operation

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Chinese Optics Letters 2022年第5期20卷 24-28页

作者：孔令豪褚宏伟李娜潘瀚赵圣之李德春 School of Information Science and Engineering Shandong UniversityQingdao 266237China School of Physics and Technology University of JinanJinan 250022China

We report VO_(x)/NaVO_(3) nanocomposite as a novel saturable absorber for the first time,to the best of our knowledge.The efficient nonlinear absorption coefficient and the modulation depth are determined by the Z-scan technology.As a saturable absorber,a passively Q-switched Nd-doped bulk laser at 1.34μm is demonstrated,producing the shortest pulse duration of 129 ns at a repetition rate of 274 kHz.In the passively Q-switched Tm:YLF laser with the prepared saturable absorber,the shortest pulse duration was 292 ns with a repetition rate of 155 kHz.Our work confirmed the saturable absorption in VO_(x)/NaVO_(3) for possible optical modulation in the near-infrared region.

关键词： nonlinear optical properties saturable absorber VO_(x)/NaVO_(3)composite O-switching

Bismuthene quantum dots integrated D-shaped fiber as saturable absorber for multi-type soliton fiber lasers

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Journal of Materiomics 2023年第1期9卷 183-190页

作者： Han Pan Hongwei Chu Ying Li Zhongben Pan Jia Zhao Shengzhi Zhao Weichun Huang Dechun Li School of Information Science and Engineering and Key Laboratory of Laser and Infrared System of Ministry of EducationShandong University72 Binhai RoadQingdao266237China Key Laboratory of Colloid and Interface Chemistry of State Education Ministry School of Chemistry and Chemical EngineeringShandong University27 Shanda South RoadJinan250100China School of Chemistry and Chemical Engineering Nantong University9 Seyuan RoadNantong226019China

In the present work,the uniformly sized bismuthene quantum dots(BiQDs)with an average diameter of 26 nm were fabricated via the solvothermal approach.By transferring the BiQDs onto the plane of micro-machined D-shaped fiber(DSF),a new type of saturable absorber(SA)was successfully prepared.Based on the evanescent field effect of D-shaped fiber,the prepared SA exhibits excellent saturable absorption properties with the maximum modulation depth of 5.1%at around 1.5μm.To further investigate its potential applications in ultrafast photonics,we demonstrated passive mode-locking operation in the erbium-doped fiber laser(EDFL)with BiQDs/DSF-SA.The conventional soliton pulses with duration of 835 fs at the repetition rate of 9.23 MHz and dissipative soliton pulses with duration of 575 fs at the repetition rate of 7.83 MHz were generated successfully.In addition,stable bound state of solitons with the pulse duration of 1.04 ps and sub-pulse time interval of 15.9 ps were also obtained based on the conventional soliton state by adjusting the pump power and polarization state.Our work reveals the great potential and capacity of BiQDs/DSF-SA in soliton mode-locking operations and promotes the explorative investigation of bismuth-based optoelectronic devices.

关键词： Bismuthene quantum dots saturable absorber Soliton mode-locking Bound-state solitons Ultrafast photonics

Single-frequency linearly polarized Q-switched fiber laser based on Nb_(2)GeTe_(4)saturable absorber

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Chinese Physics B 2023年第7期32卷 382-386页

作者：陈思雨邓海芹张万儒戴永平王涛俞强李灿姜曼粟荣涛吴坚周朴 College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Nanhu Laser Laboratory National University of Defense TechnologyChangsha 410073China CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)Suzhou 215123China

We report a single-frequency linearly polarized Q-switched fiber laser based on an Nb_(2)GeTe_(4)saturable absorber(SA).The Nb_(2)GeTe_(4)SA triggers passive Q-switching of the laser,and an un-pumped Yb-doped fiber together with a 0.08-nmbandwidth polarization-maintaining fiber Bragg grating(FBG)acts as an ultra-narrow bandwidth filter to realize singlelongitudinal-mode(SLM)oscillation.The devices used in the laser are all kept polarized,so as to ensure linearly polarized laser output.Stable SLM linearly polarized Q-switching operation at 1064.6 nm is successfully achieved,producing a laser with a shortest pulse width of 1.36μs,a linewidth of 28.4 MHz,a repetition rate of 28.3 kHz-95.9 kHz,and a polarization extinction ratio of about 30 dB.It is believed that the single-frequency linearly polarized pulsed fiber laser studied in this paper has great application value in gravitational wave detection,beam combining,nonlinear frequency conversion,and other fields.

关键词： fiber laser saturable absorber single-longitudinal-mode pulsed laser

Passively mode-locked erbium-doped fiber laser via a D-shape-fiber-based MoS_2 saturable absorber with a very low nonsaturable loss

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Chinese Physics B 2016年第2期25卷 190-194页

作者：段利娜苏玉龙王勇刚李璐王茜王屹山 State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences

We report on the generation of conventional and dissipative solitons in erbium-doped fiber lasers by the evanescent field interaction between the propagating light and a multilayer molybdenum disulfide（MoS_2） thin film. The MoS_2 film is fabricated by depositing the MoS_2 water–ethanol mixture on a D-shape-fiber（DF） repetitively. The measured nonsaturable loss, saturable optical intensity, and the modulation depth of this device are 13.3%, 110 MW/cm^2, and 3.4% respectively.Owing to the very low nonsaturable loss, the laser threshold of conventional soliton is as low as 4.8 mW. The further increase of net cavity dispersion to normal regime, stable dissipation soliton pulse trains with a spectral bandwidth of 11.7 nm and pulse duration of 116 ps are successfully generated. Our experiment demonstrates that the MoS_2-DF device can indeed be used as a high performance saturable absorber for further applications in ultrafast photonics.

关键词： fiber laser nano-sheet materials saturable absorber mode locking

Zinc-oxide/PDMS-clad tapered fiber saturable absorber for passively mode-locked erbium-doped fiber laser

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Chinese Physics B 2021年第5期30卷 384-389页

作者： F D Muhammad S A S Husin E K Ng K Y Lau C A C Abdullah M A Mahdi Department of Physics Faculty of ScienceUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Wireless and Photonics Networks Research Centre Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Electronics and Nanoengineering Tietotie 3Aalto University02150 EspooFinland

We propose and demonstrate a passively mode-locked erbium-doped fiber laser(EDFL)based on zinc-oxide/polydimethylsiloxane(ZnO/PDMS)saturable absorber(SA)that evanescently interacts with the light on a tapered fiber.The ZnO/PDMS composite is coated on the whole surface of the tapered fiber to guarantee the maximum efficiency of the SA device,with a measured insertion loss of 0.87 dB and a modulation depth of 6.4%.The proposed laser can generate soliton mode-locking operation at a threshold power of 33.07 mW.The generated output pulse yields a repetition rate and pulse width of 9.77 MHz and 1.03 ps,respectively.These results indicate that the proposed ZnO/PDMS-clad tapered fiber could be useful as an efficient,compatible,and low-cost SA device for ultrafast laser applications.

关键词： zinc-oxide saturable absorber tapered fiber mode-locked fiber laser

Q-Switching Pulse Generation with Thulium-Doped Fiber saturable absorber

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Chinese Physics Letters 2014年第12期31卷 56-58页

作者： Zian Cheak Tiui Arman Zarei Sin Jin Tan Harith Ahmad Sulaiman Wadi Harun Department of Electrical Engineering Faculty of Engineering University of Malaya Kuala Lumpur 50603 Malaysia Photonics Research Center University of Malaya Kuala Lumpur 50603 Malaysia School of Engineering KDU University College SS22/41 Damansara Jaya PetMing Jaya 47400 Selangor Darul Ehsan Malaysia

Q-switched pulsed laser systems operating in the eye-safe wavelength region （λ〉 1.4 μm） are promis- ing for applications such as light detection and ranging （lidar）, differential absorption lidar, optical communi- cation, sensor and instrumentations. Fiber lasers are particularly attractive for such applications due to the fact that the beam quality can be independent of output power and they can be robustly engineered. There is an increasing interest in Q-switched erbium- doped fiber lasers （EDFLs）, which can be generated by using either active or passive techniques. Com- pared with the actively Q-switched ones, passively Q- switched EDFLs have attracted much attention for their advantages of compactness, low cost, flexibility and simplicity of design. Different kinds of saturable absorbers, such as the transition metal-doped crys- tals and semiconductor quantum-well structures, have been applied to realize Q-switched EDFLs.How- ever, when they are used in the laser cavity, additional alignment devices, such as lens, mirrors or U-bench units, have to be applied. This may increase the in- sertion loss and the complexity of the laser cavity.

关键词： Q-Switching Pulse Thulium-Doped Fiber saturable absorber

Passive mode-locked Er-doped fiber laser pulse generation based on titanium disulfide saturable absorber

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Frontiers of Information Technology & Electronic Engineering 2021年第5期22卷 756-766页

作者： Xinxin SHANG Linguang GUO Huanian ZHANG Dengwang LI Qingyang YUE Shandong Provincial Engineering and Technical Center of Light Manipulations Shandong Provincial Key Laboratory of Optics and Photonic DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250358China School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255049China Shandong Key Laboratory of Medical Physics and Image Processing School of Physics and ElectronicsShandong Normal UniversityJinan 250358China Shandong Institute of Industrial Technology for Health Sciences and Precision Medicine School of Physics and ElectronicsShandong Normal UniversityJinan 250358China

In this study,titanium disulfide(TiS_(2))polyvinyl alcohol(PVA)film-type saturable absorber(SA)is synthesized with a modulation depth of 5.08%and a saturable intensity of 10.62 MW/cm^(2) by liquid-phase exfoliation and spin-coating methods.Since TiS2-based SA has a strong nonlinear saturable absorption property,two types of optical soliton were observed in a mode-locked Er-doped fiber laser.When the pump power was raised to 67.3 mW,a conventional mode-locked pulse train with a repetition rate of 1.716 MHz and a pulse width of 6.57 ps was generated,and the output spectrum centered at 1556.98 nm and 0.466 nm spectral width with obvious Kelly sidebands was obtained.Another type of mode-locked pulse train with the maximum output power of 3.92 mW and pulse energy of 2.28 nJ at the pump power of 517.2 mW was achieved when the polarization controllers were adjusted.Since TiS2-based SA has excellent nonlinear saturable absorption characteristics,broad applications in ultrafast photonic are expected.

关键词： Fiber laser Passive mode-locked saturable absorber Titanium disulfide

Two-dimensional tellurium saturable absorber for ultrafast solid-state laser

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Chinese Optics Letters 2021年第3期19卷 64-68页

作者：杨子鑫韩丽莉杨琦任向河 Syed Zaheer Ud Din 张晓艳冷建材张家宝张百涛杨克建何京良李春龙王俊 International School for Optoelectronic Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250300China Department of Chemistry Shanghai UniversityShanghai 200A44China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China School of Electronic and Information Engineering(Department of Physics) Qilu University of Technology(Shandong Academy of Sciences)Jinan 250300China State Key Laboratory of Biobased Material and Green Papermaking Qilu University of Technology(Shandong Academy of Sciences)Jinan 250300China Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

Two-dimensional(2 D) Te nanosheets were successfully fabricated through the liquid-phase exfoliation(LPE) method. The nonlinear optical properties of 2 D Te nanosheets were studied by the open-aperture Z-scan technique. Furthermore, the continuous wave mode-locked Nd:YVO4 laser was successfully realized by using 2 D Te as a saturable absorber(SA) for the first time, to the best of our knowledge. Ultrashort pulses as short as 5.8 ps were obtained at 1064.3 nm with an output power of 851 m W. This primary investigation indicates that the 2 D Te SA is a promising photonic device in the fields of ultrafast solid-state lasers.

关键词： tellurium Z-scan saturable absorber ultrafast solid-state laser

Transmission Properties of a New Glass Ceramic and Doped with Co^(2+) as saturable absorber for 1.54 μm Er Glass Short Pulse Laser

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Journal of Wuhan University of Technology(Materials Science) 2012年第1期27卷 54-57页

作者：于春雷 CHEN Li FENG Suya HE Dongbing WANG Meng HU Lili Key Laboratory of Materials for High Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

The preparation and characteristics of a new transparent glass ceramic were described. Crystal phase particles with nanometer size were successfully precipitated in glass matrix, which was confirmed to be one of indium aluminum zinc oxide compounds （InxAlrZn2O）. The presence of aluminum （A1） and indium （In） impurities in the zinc oxides （ZnO） crystal lattice leads to some changes of the carrier concentration in the material and then promote the sharply changes of transmission spectra in IR range wavelength. And subsequently, the IR cut-off edge blue shifted from 5.5 pm in base glass to 3 μm in transparent glass ceramic sample. Furthermore, passive Q switched 1.54 ktm Er glass laser pulses with pulse energy of 10 mJ and pulse width of 800 ns were successfully obtained by using the cobalt doped transparent glass ceramic as a saturable absorber.

关键词： glass-ceramics infrared transmission Co2＋ doped saturable absorber Er glass laser