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digital micromirror device;flat-top beam;orbital angular momentum;perfect vortex beam;random fiber laser

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High Power laser Science and Engineering 2024年第1期12卷 42-51页

作者： Rui Ma Ke Hai Luo Jing Song He Wei Li Zhang Dian Yuan Fan Anderson S.L.Gomes Jun Liu International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhenChina Institute for Advanced Study Shenzhen UniversityShenzhenChina fiber Optics Research Centre School of Information and Communication EngineeringUniversity of Electronic Science and Technology of ChinaChengduChina Departamento de Física Universidade Federal de PernambucoRecife-PEBrazil

High-intensity vortex beams with tunable topological charges and low coherence are highly demanded in applications such as inertial confinement fusion(ICF) and optical communication. However, traditional optical vortices featuring nonuniform intensity distributions are dramatically restricted in application scenarios that require a high-intensity vortex beam owing to their ineffective amplification resulting from the intensity-dependent nonlinear effect. Here, a low-coherence perfect vortex beam(PVB) with a topological charge as high as 140 is realized based on the super-pixel wavefront-shaping technique. More importantly, a globally adaptive feedback algorithm(GAFA) is proposed to efficiently suppress the original intensity fluctuation and achieve a flat-top PVB with dramatically reduced beam speckle contrast. The GAFA-based flat-top PVB generation method can pave the way for high-intensity vortex beam generation,which is crucial for potential applications in ICF, laser processing, optical communication and optical trapping.

关键词： digital micromirror device flat-top beam orbital angular momentum perfect vortex beam random fiber laser

Kilowatt-level supercontinuum generation in a single-stage random fiber laser with a half-open cavity

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High Power laser Science and Engineering 2023年第6期11卷 139-145页

作者： Li Jiang Jinming Wu Rui Song Zilun Chen Xiran Zhu Fengchang Li Kailong Li Hanwei Zhang Jing Hou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangshaChina Nanhu laser Laboratory National University of Defense TechnologyChangshaChina Hunan Provincial Key Laboratory of High Energy laser Technology National University of Defense TechnologyChangshaChina

The random distributed-feedback fiber laser(RFL) is a new approach to obtain a high-power stable supercontinuum(SC) source.To consider both structure simplification and high-power SC output,an innovative structure achieving a kilowatt-level SC output in a single-stage RFL with a half-open cavity is demonstrated in this paper.It consists of a fiber oscillator,a piece of long passive fiber and a broadband coupler,among which the broadband coupler acting as a feedback device is crucial in SC generation.When the system has no feedback,the backward output power is up to298 W under the pump power of 1185 W.When the feedback is introduced before the pump laser,the backward power loss can be reduced and the pump can be fully utilized,which could promote forward output power and conversion efficiency significantly.Under the maximum pump power of 1847 W,a 1300 W SC with spectrum ranging from 887 to1920 nm and SC conversion efficiency of 66% is obtained.To the best of our knowledge,it is the simplest structure used for high-power SC generation,and both the generated SC output power and the conversion efficiency are highest in the scheme of the half-opened RFL output SC.

关键词： high conversion efficiency high-power supercontinuum random fiber laser single-stage structure

Ultra-high speed random bit generation based on Rayleigh feedback assisted ytterbium-doped random fiber laser

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Science China(Technological Sciences) 2021年第6期64卷 1295-1301页

作者： WU Han XIONG Ji HAN Bing WANG ZiNan ZHANG WeiLi JIA XinHong LIANG HouKun College of Electronics and Information Engineering Sichuan UniversityChengdu 610064China Key Lab of Optical fiber Sensing&Communications University of Electronic Science&Technology of ChinaChengdu 611731China School of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610101China

In this paper, we propose an ultra-high speed random bit generator without the time-delay signature based on an ytterbium-doped random fiber laser(YRFL) with Rayleigh scattering feedback. The spectrum of the YRFL has a relatively broad bandwidth(0.35 nm) and the lasing temporal intensity shows random fluctuations without cavity induced time-delay signatures(TDS),which are essential for ultra-high speed random bit generation. The chaotic signal and its time-delayed signal sampling at40 Giga samples per second(GS/s) are converted to digital 8-bit signals. By selecting 5 least significant bits from each 8-bit digital signal and using bitwise exclusive-OR operation, we experimentally achieve 200 Gbps physical random bit generation based on ytterbium-doped random fiber laser with the verified randomness. The combination of broadband emission and free of TDS makes random fiber lasers new promising sources for high performance random bit generation in a simple and compact configuration, which has a great potential in cryptography and secure communication applications.

关键词： random fiber laser Rayleigh scattering random bit generation random laser

Dental Imaging With Near-Infrared Transillumination Using random fiber laser

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Photonic Sensors 2020年第4期10卷 333-339页

作者： Jiayu GUO Yunjiang RAO Weili ZHANG Zewen CUI Anran LIU Yongmei YAN Key Laboratory of Optical fiber Sensing&Communications(Ministry of Education) University of Electronic Science and Technology of ChinaChengdu 611731China

Contrary to the conventional detection method like radiography,the near infrared light source has been demonstrated to be suitable for dental imaging due to different reflectivity among enamel,dentin,and caries lesion.In this paper,three light sources with different bandwidths based on a transillumination method are compared.The contrast among enamel,dentin,and caries lesion is calculated in different situations.The experimental results show that the random fiber laser has the best comprehensive quality in dental imaging due to its high spectral density,low coherence,and deep penetration.This work provides a guidance for light source selection in dental imaging.

关键词： random fiber laser near infrared dental imaging caries detection

Cascaded random Raman fiber laser With Low RIN and Wide Wavelength Tunability

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Photonic Sensors 2022年第4期12卷 36-44页

作者： Bing HAN Shisheng DONG Yang LIU Zinan WANG Key Laboratory of Optical fiber Sensing&Communications(Ministry of Education) University of Electronic Science and Technology of ChinaChengdu 611731China

Cascaded random Raman fiber lasers(CRRFLs)have been used as a new platform for designing high power and wavelength-agile laser sources.Recently,CRRFL pumped by ytterbium-doped random fiber laser(YRFL)has shown both high power output and low relative intensity noise(RIN).Here,by using a wavelength-and bandwidth-tunable point reflector in YRFL,we experimentally investigate the impacts of YRFL on the spectral and RIN properties of the CRRFL.We verify that the bandwidth of the point reflector in YRFL determines the bandwidth and temporal stability of YRFL.It is found that with an increase in the bandwidth of the point reflector in YRFL from 0.2 nm to 1.4 nm,CRRFL with higher spectral purity and lower RIN can be achieved due to better temporal stability of YRFL pump.By broadening the point reflector’s bandwidth to 1.4 nm,the lasing power,spectral purity,and RIN of the 4th-order random lasing at 1349 nm can reach 3.03 W,96.34%,and–115.19 dB/Hz,respectively.For comparison,the spectral purity and RIN of the 4th-order random lasing with the point reflector’s bandwidth of 0.2 nm are only 91.20%and–107.99 dB/Hz,respectively.Also,we realize a wavelength widely tunable CRRFL pumped by a wavelength-tunable YRFL.This work provides a new platform for the development of ideal distributed Raman amplification pump sources based on CRRFLs with both good temporal stability and wide wavelength tunability,which is of great importance in applications of optical fiber communication and distributed sensing.

关键词： random fiber laser Raman fiber laser relative intensity noise distributed Raman amplification

LD-Pumped random fiber laser Based on Erbium-Ytterbium Co-Doped fiber

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Photonic Sensors 2020年第2期10卷 181-185页

作者： Qingyang MENG Han WU Bing HAN Jiaqi LI Zinan WANG Key Lab of Optical fiber Sensing&Communications University of Electronic Science&Technology of ChinaChengdu 611731China Center for Information Geoscience University of Electronic Science and Technology of ChinaChengdu 611731China

In this paper,a cladding-pumped erbium-ytterbium co-doped random fiber laser(EYRFL)operating at 1550 nm with high power laser diode(LD)is proposed and experimentally demonstrated for the first time.The laser cavity includes a 5-m-long erbium-ytterbium co-doped fiber that serves as the gain medium,as well as a 2-km-long single-mode fiber(SMF)to provide random distributed feedback.As a result,stable 2.14 W of 1550 nm random lasing at 9.80 W of 976 nm LD pump power and a linear output with the slope efficiency as 22.7%are generated.This simple and novel random fiber laser could provide a promising way to develop high power 1.5μm light sources.

关键词： random fiber laser erbium-ytterbium co-doped cladding pumping

Statistical properties of Er/Yb co-doped random Rayleigh feedback fiber laser

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Chinese Optics Letters 2021年第2期19卷 35-39页

作者：吴函韩冰王子南梁厚昆 College of Electronics and Information Engineering Sichuan UniversityChengdu 610064China fiber Optics Research Centre School of Information and Communication EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China

In this Letter, we experimentally investigate fast temporal intensity dynamics and statistical properties of the claddingpumped Er/Yb co-doped random Rayleigh feedback fiber laser(EYRFL) for the first time, to the best of our knowledge. By using the optical spectral filtering method, strong and fast intensity fluctuations with the generation of extreme events are revealed at the output of EYRFL. The statistics of the intensity fluctuations strongly depends on the wavelength of the filtered radiation, and the intensity probability density function(PDF) with a heavy tail is observed in the far wings of the spectrum. We also find that the PDF of the intensity in the central part of the spectrum deviates from the exponential distribution and has the dependence on the laser operating regimes, which indicates some correlations among different frequency components exist in the EYRFL radiation and may play an important role in the random lasing spectrum stabilization process.

关键词： random fiber laser temporal dynamics Rayleigh scattering

2kW random fiber laser based on hybrid Yb-Raman gain [Invited]

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Chinese Optics Letters 2023年第9期21卷 28-33页

作者：叶俊张扬梁峻锐马小雅许将明姚天甫冷进勇周朴 College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Nanhu laser Laboratory National University of Defense TechnologyChangsha 410073China Hunan Provincial Key Laboratory of High Energy laser Technology National University of Defense TechnologyChangsha 410073China

High-power operation is one of the most important research topics surrounding random fiber lasers(RDFLs).Here we optimized the cavity structure and proposed a new scheme based on hybrid gain to address the issue of high-power backward light in traditional kilowatt-level RDFLs.Consequently,a record power of 1972 W was achieved while the maximum backward leaked power only reached 0.12 W.The conversion efficiency relative to the laser diode pump power was 68.4%,and the highest spectral purity of the random lasing reached 98.1%.This work may provide a reference for high-power RDFLs,Raman fiber lasers,and long-wavelength Yb-doped fiber lasers.

关键词： random fiber laser high power hybrid gain stimulated Raman scattering Rayleigh scattering

Generation of 1.3/1.4μm random fiber laser by bismuth-doped phosphosilicate fiber

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中国光学快报:英文版 2023年第7期21卷 35-38页

作者：王航贾文成姚永嘉杨欣芸 Mikhail Melkumov Sergey Firstov Alexey Lobanov 董志鹏罗正钱 Fujian Key Laboratory of Ultrafast laser Technology and Applications School of Electronic Science and EngineeringXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China Prokhorov General Physics Institute Dianov Fiber Optics Research CenterRussian Academy of SciencesMoscow 119333Russia Devyatykh Institute of Chemistry of High-Purity Substances Russian Academy of SciencesNizhny Novgorod 603951Russia

We have successfully generated a 1.3/1.4μm random fiber laser(RFL)using bismuth(Bi)-doped phosphosilicate fiber.The Bi-doped RFL has shown excellent long-term operational stability with a standard deviation of approximately 0.34%over 1 h at a maximum output power of 549.30 mW,with a slope efficiency of approximately 29.21%.The Bi-doped phosphosilicate fiber offers an emission spectrum ranging from 1.28 to 1.57μm,indicating that it can be tuned within this band.Here,we demonstrated a wavelength-tuning fiber laser with a wavelength of 1.3/1.4μm,achieved through the using of a fiber Bragg grating or a tunable filter.Compared to traditional laser sources,the RFL reduces the speckle contrast of images by 11.16%.Due to its high stability,compact size,and high efficiency,this RFL is highly promising for use in biomedical imaging,communication,and sensor applications.

关键词： random fiber laser bismuth-doped fiber wavelength tuning fiber laser