In this work,a high-energy and high peak power chirped pulse amplifcation system with near difraction-limited beam quality based on tapered confned-doped fber(TCF)is experimentally demonstrated.The TCF has a core nume...In this work,a high-energy and high peak power chirped pulse amplifcation system with near difraction-limited beam quality based on tapered confned-doped fber(TCF)is experimentally demonstrated.The TCF has a core numerical aperture of 0.07 with core/cladding diameter of 35/250µm at the thin end and 56/400μm at the thick end.With a backward-pumping confguration,a maximum single pulse energy of 177.9μJ at a repetition rate of 504 kHz is realized,corresponding to an average power of 89.7 W.Through partially compensating for the accumulated nonlinear phase during the amplifcation process via adjusting the high order dispersion of the stretching chirped fber Bragg grating,the duration of the amplifed pulse is compressed to 401 fs with a pulse energy of 126.3μJ and a peak power of 207 MW,which to the best of our knowledge represents the highest peak power ever reported from a monolithic ultrafast fber laser.At the highest energy,the polarization extinction ratio and the M2 factor were respectively measured to be~19 dB and 1.20.In addition,the corresponding intensity noise properties as well as the short-and long-term stability were also examined,verifying a stable operation of the system.It is believed that the demonstrated laser source could fnd important applications in,for example,advanced manufacturing and photomedicine.展开更多
Flexible and wearable electronics represent paramount technologies ofering revolutionized solutions for medical diagnosis and therapy,nerve and organ interfaces,fabric computation,robot-in-medicine and metaverse.Being...Flexible and wearable electronics represent paramount technologies ofering revolutionized solutions for medical diagnosis and therapy,nerve and organ interfaces,fabric computation,robot-in-medicine and metaverse.Being ubiquitous in everyday life,piezoelectric materials and devices play a vital role in fexible and wearable electronics with their intriguing functionalities,including energy harvesting,sensing and actuation,personal health care and communications.As a new emerging fexible and wearable technology,fber-shaped piezoelectric devices ofer unique advantages over conventional thin-flm counterparts.In this review,we survey the recent scientifc and technological breakthroughs in thermally drawn piezoelectric fbers and fber-enabled intelligent fabrics.We highlight the fber materials,fber architecture,fabrication,device integration as well as functions that deliver higher forms of unique applications across smart sensing,health care,space security,actuation and energy domains.We conclude with a critical analysis of existing challenges and opportunities that will be important for the continued progress of this feld.展开更多
Optical fber communication networks play an important role in the global telecommunication network.However,nonlinear efects in the optical fber and transceiver noise greatly limit the performance of fber communication...Optical fber communication networks play an important role in the global telecommunication network.However,nonlinear efects in the optical fber and transceiver noise greatly limit the performance of fber communication systems.In this paper,the product of mutual information(MI)and communication bandwidth is used as the metric of the achievable information rate(AIR).The MI loss caused by the transceiver is also considered in this work,and the bit-wise MI,generalized mutual information(GMI),is used to calculate the AIR.This loss is more signifcant in the use of higher-order modulation formats.The AIR analysis is carried out in the QPSK,16QAM,64QAM and 256QAM modulation formats for the communication systems with diferent communication bandwidths and transmission distances based on the enhanced Gaussian noise(EGN)model.The paper provides suggestions for the selection of the optimal modulation format in diferent transmission scenarios.展开更多
Stable picosecond dissipative soliton pulses were observed in an ytterbium-doped fber laser employing a high-quality mixture of BP/SnSe_(2)-PVA saturable absorber(SA).The modulation depth,saturation intensity,and non-...Stable picosecond dissipative soliton pulses were observed in an ytterbium-doped fber laser employing a high-quality mixture of BP/SnSe_(2)-PVA saturable absorber(SA).The modulation depth,saturation intensity,and non-saturable loss of the mixture of BP/SnSe_(2)-PVA SA were measured with values of 5.98%,18.37 MW/cm2,and 33%,respectively.Within the pump power range of 150–270 mW,stable dissipative soliton pulses were obtained with an output power of 1.68–4 mW.When the minimum pulse duration is 1.28 ps,a repetition rate of 0.903 MHz,center wavelength of 1064.38 nm and 3 dB bandwidth of 2 nm were obtained.The maximum pulse energy of 4.43 nJ and the signal-to-noise ratio up to 72 dB were achieved at pump power of 270 mW.The results suggest that the BP/SnSe_(2)-PVA mixture SA has outstanding nonlinear saturable absorption characteristics and broad ultrafast laser applications.展开更多
基于保偏光纤的温度双折射效应,提出一种高精度、低成本、具有良好互易性的反射式保偏光纤温度传感器(Polarization-Maintaining Fiber Temperature Sensor,PMF-TS)。采用体积小、重量轻的光纤温度探头,可与半导体激光器激光输出光纤集...基于保偏光纤的温度双折射效应,提出一种高精度、低成本、具有良好互易性的反射式保偏光纤温度传感器(Polarization-Maintaining Fiber Temperature Sensor,PMF-TS)。采用体积小、重量轻的光纤温度探头,可与半导体激光器激光输出光纤集成,组成多功能激光治疗仪探针,通过实时、精确监测靶组织的温度变化,闭环控制半导体激光器的输出能量及脉冲频率,满足体内深度肿瘤组织精准微创激光热疗的应用需求。完成了样机研制及测试,结果表明,PMF-TS的测温分辨率为0.01℃,远优于18B20数字温度传感器及PT100铂电阻温度传感器。经过PMF-TS的闭环控制以后,半导体激光器在-40℃~70℃环境温度范围内,输出功率的波动可以控制在±0.1 W以内。展开更多
基金the Director Fund of State Key Laboratory of Pulsed Power Laser Technology(No.SKL2020ZR02)the Postgraduate Scientifc Research Innovation Project of Hunan Province(No.QL20220007).
文摘In this work,a high-energy and high peak power chirped pulse amplifcation system with near difraction-limited beam quality based on tapered confned-doped fber(TCF)is experimentally demonstrated.The TCF has a core numerical aperture of 0.07 with core/cladding diameter of 35/250µm at the thin end and 56/400μm at the thick end.With a backward-pumping confguration,a maximum single pulse energy of 177.9μJ at a repetition rate of 504 kHz is realized,corresponding to an average power of 89.7 W.Through partially compensating for the accumulated nonlinear phase during the amplifcation process via adjusting the high order dispersion of the stretching chirped fber Bragg grating,the duration of the amplifed pulse is compressed to 401 fs with a pulse energy of 126.3μJ and a peak power of 207 MW,which to the best of our knowledge represents the highest peak power ever reported from a monolithic ultrafast fber laser.At the highest energy,the polarization extinction ratio and the M2 factor were respectively measured to be~19 dB and 1.20.In addition,the corresponding intensity noise properties as well as the short-and long-term stability were also examined,verifying a stable operation of the system.It is believed that the demonstrated laser source could fnd important applications in,for example,advanced manufacturing and photomedicine.
基金supported by Nanyang Technological University(021850-00001:Wei Yan)the National Natural Science Foundation of China(Grant No.52202167).
文摘Flexible and wearable electronics represent paramount technologies ofering revolutionized solutions for medical diagnosis and therapy,nerve and organ interfaces,fabric computation,robot-in-medicine and metaverse.Being ubiquitous in everyday life,piezoelectric materials and devices play a vital role in fexible and wearable electronics with their intriguing functionalities,including energy harvesting,sensing and actuation,personal health care and communications.As a new emerging fexible and wearable technology,fber-shaped piezoelectric devices ofer unique advantages over conventional thin-flm counterparts.In this review,we survey the recent scientifc and technological breakthroughs in thermally drawn piezoelectric fbers and fber-enabled intelligent fabrics.We highlight the fber materials,fber architecture,fabrication,device integration as well as functions that deliver higher forms of unique applications across smart sensing,health care,space security,actuation and energy domains.We conclude with a critical analysis of existing challenges and opportunities that will be important for the continued progress of this feld.
基金supported by the National Key Research and Development Program of China(No.2022YFE0202100)EU Horizon 2020 MSCA Grant 101008280 and UK Royal Society Grant(IES\R3\223068).
文摘Optical fber communication networks play an important role in the global telecommunication network.However,nonlinear efects in the optical fber and transceiver noise greatly limit the performance of fber communication systems.In this paper,the product of mutual information(MI)and communication bandwidth is used as the metric of the achievable information rate(AIR).The MI loss caused by the transceiver is also considered in this work,and the bit-wise MI,generalized mutual information(GMI),is used to calculate the AIR.This loss is more signifcant in the use of higher-order modulation formats.The AIR analysis is carried out in the QPSK,16QAM,64QAM and 256QAM modulation formats for the communication systems with diferent communication bandwidths and transmission distances based on the enhanced Gaussian noise(EGN)model.The paper provides suggestions for the selection of the optimal modulation format in diferent transmission scenarios.
基金the National Natural Science Foundation of China(Grant No.62005094)the Natural Science Foundation of Shandong Province(No.ZR2021MF128)+2 种基金the Key Research Program of Shandong Province(No.2020JMRH0302)the Industrial Chain Program of Shandong Laser Equipment Innovation and Entrepreneurship Community(No.JGCYL2022-5)the Research Fund of University of Jinan(No.XKY1739).
文摘Stable picosecond dissipative soliton pulses were observed in an ytterbium-doped fber laser employing a high-quality mixture of BP/SnSe_(2)-PVA saturable absorber(SA).The modulation depth,saturation intensity,and non-saturable loss of the mixture of BP/SnSe_(2)-PVA SA were measured with values of 5.98%,18.37 MW/cm2,and 33%,respectively.Within the pump power range of 150–270 mW,stable dissipative soliton pulses were obtained with an output power of 1.68–4 mW.When the minimum pulse duration is 1.28 ps,a repetition rate of 0.903 MHz,center wavelength of 1064.38 nm and 3 dB bandwidth of 2 nm were obtained.The maximum pulse energy of 4.43 nJ and the signal-to-noise ratio up to 72 dB were achieved at pump power of 270 mW.The results suggest that the BP/SnSe_(2)-PVA mixture SA has outstanding nonlinear saturable absorption characteristics and broad ultrafast laser applications.
文摘基于保偏光纤的温度双折射效应,提出一种高精度、低成本、具有良好互易性的反射式保偏光纤温度传感器(Polarization-Maintaining Fiber Temperature Sensor,PMF-TS)。采用体积小、重量轻的光纤温度探头,可与半导体激光器激光输出光纤集成,组成多功能激光治疗仪探针,通过实时、精确监测靶组织的温度变化,闭环控制半导体激光器的输出能量及脉冲频率,满足体内深度肿瘤组织精准微创激光热疗的应用需求。完成了样机研制及测试,结果表明,PMF-TS的测温分辨率为0.01℃,远优于18B20数字温度传感器及PT100铂电阻温度传感器。经过PMF-TS的闭环控制以后,半导体激光器在-40℃~70℃环境温度范围内,输出功率的波动可以控制在±0.1 W以内。
