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High-power,electronically controlled source of user-defined vortex and vector light beams based on a few-mode fiber amplifier

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Photonics Research 2021年第5期9卷 856-864页

作者： DI LIN joel carpenter YUTONG FENG YONGMIN JUNG SHAIF-UL ALAM DAVID J.RICHARDSON Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK School of Information Technology and Electrical Engineering The University of QueenslandBrisbaneQLD 4072Australia

Optical angular momentum(OAM)-based structured light beams provide an additional degree of freedom for practical applications ranging from optical communication to laser-based material processing. Many techniques exist for generating such beams within laser sources and these primarily rely upon the use of specially designed optical components that limit laser power scaling and ready tunability of the topological charge and polarization of the output OAM beams. Here we show that some of these limitations can be overcome by employing a computer controlled reflective phase-only spatial light modulator to adaptively tailor the input(and subsequent output) beam wavefront and polarization in a few-mode fiber amplifier. In this way modal-coupling-induced beam distortion within the fiber amplifier can be mitigated and we are able to generate at will any desired supported spatial mode guided in the fiber, including conventional linearly polarized(LP) modes, scalar OAM modes, and cylindrical vector modes, at average powers >10 W and with a peak power of >11 kW. Our results pave the way to the realization of practical high-power structured laser sources with tunable chirality and polarization.

关键词： amplifier fiber power

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Controlled generation of picosecond-pulsed higher-order Poincaré sphere beams from an ytterbium-doped multicore fiber amplifier

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Photonics Research 2023年第2期11卷 181-188页

作者： KUNHAO JI DI LIN IAN A. DAVIDSON SIYI WANG joel carpenter YOSHIMICHI AMMA YONGMIN JUNG MASSIMILIANO GUASONI DAVID J. RICHARDSON Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK Institute of Advanced Photonics Technology School of Information EngineeringGuangdong University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Photonics Information Technology Guangdong University of TechnologyGuangzhou 510006China School of Information Technology and Electrical Engineering The University of QueenslandBrisbaneQLD 4072Australia Fujikura Ltd. Chiba 285-8550Japan

Higher-order Poincarésphere(HOPS) beams with spatially variable polarization and phase distributions are opening up a host of unique applications in areas ranging from optical communication to ***, the flexible generation of these beams with high peak power from compact laser systems remains a challenge. Here, we demonstrate the controlled generation of HOPS beams based on coherent beam combination from an Yb-doped multicore fiber(MCF) amplifier. Using a spatial light modulator to adaptively adjust the wavefront and polarization of the signals seeded into the individual cores of the MCF various structured beams(including cylindrical vector beams and first-and second-order vortex beams) were generated with peak powers up to 14 k W for ~92 ps pulses.

关键词： amplifier polarization fiber

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Design, fabrication, and characterization of a highly nonlinear few-mode fiber

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Photonics Research 2019年第11期7卷 1354-1362页

作者： Jitao Gao Elham Nazemosadat Chen Yang Songnian Fu Ming Tang Weijun Tong joel carpenter Jochen Schroder Magnus Karlsson Peter A.Andrekson Wuhan National Laboratory for Optoelectronics and School of Optics and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China Photonics Laboratory Department of Microtechnology and NanoscienceChalmers University of TechnologyGothenburg 41296Sweden State Key Laboratory of Optical Fiber and Cable Manufacture Technology Yangtze Optical Fiber and Cable Joint Stock Limited Company(YOFC)Wuhan 430073China School of Information Technology and Electrical Engineering The University of QueenslandBrisbaneQLD 4072Australia

We present the design, fabrication, and characterization of a highly nonlinear few-mode fiber(HNL-FMF) with an intermodal nonlinear coefficient of 2.8 W · km-1, which to the best of our knowledge is the highest reported to date. The graded-index circular core fiber supports two mode groups(MGs) with six eigenmodes and is highly doped with germanium. This breaks the mode degeneracy within the higher-order MG, leading to different group velocities among corresponding eigenmodes. Thus, the HNL-FMF can support multiple intermodal four-wave mixing processes between the two MGs at the same time. In a proof-of-concept experiment, we demonstrate simultaneous intermodal wavelength conversions among three eigenmodes of the HNL-FMF over the C band.

关键词： fiber mode nonlinear

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Predictors of clinical outcomes after non-operative management of symptomatic full-thickness rotator cuff tears

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World Journal of Orthopedics 2021年第4期12卷 223-233页

作者： Christopher Bush joel J Gagnier James carpenter Asheesh Bedi Bruce Miller Department of Orthopaedic Surgery University of MichiganAnn ArborMI 48106United States

BACKGROUND Previous studies have shown that non-surgical management can be an effective treatment strategy for many patients with rotator cuff *** the prevalence of rotator cuff disease,few studies have examined the patient and tear related factors that predict outcomes of nonsurgical management in this cohort of *** To identify factors that are associated with changes in patient reported outcomes over time in individuals with full-thickness rotator cuff tears treated without *** A cohort of 59 patients who underwent non-surgical management of full thickness rotator cuff tears with a minimum of 1-year follow-up were identified from our institutional *** demographics,comorbidities and tear characteristics were collected at initial *** measures were collected at baseline and at each clinical follow-up,which included Western Ontario Rotator Cuff(WORC)index,American Shoulder and Elbow Surgeons score,Visual Analog Scale for pain and Single Assessment Numerical ***-and univariate regression analyses were used to determine the impact of each patient and tear related variable on final WORC scores and change in WORC scores throughout the *** In this non-surgical cohort,all patient-reported outcome measures significantly improved compared to baseline at 1 and 2-year *** was no significant difference in outcomes between 1 and 2 *** average improvement surpassed the published minimal clinically important differences values for WORC,American Shoulder and Elbow Surgeons,Visual Analog Scale pain and Single Assessment Numerical Evaluation *** analysis identified female gender(β=-19.88,P=0.003),smoking(β=-29.98,P=0.014)and significant subscapularis fatty infiltration(β=-15.35,P=0.024)as predictors of less favorable WORC scores at 1 year,and female gender(β=-19.09,P=0.015)alone as a predictor of lower WORC scores at 2 *** with symptom duration greater than 1

关键词： Rotator cuff tear Conservative treatment Patient reported outcome measures Shoulder injuries Shoulder pain

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