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All-normal-dispersion Yb-doped mode-locked fibre laser and its stability analysis

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Chinese Physics B 2010年第7期19卷 308-312页

作者：孔令杰肖晓晟杨昌喜 State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua University

We experimentally demonstrate an all-normal-dispersion Yb-doped mode-locked fibre laser with no intentional spectral filter inserted. Pulses with 1.1 nJ pulse energy at a repetition rate of 20.4 MHz are achieved. A theoretical model of the fibre laser is derived, whose coefficients are explicitly dependent on the orientations of the wave plates and the polarizer. Based on the model, stability diagrams of both the mode-locking and the continuous wave regimes of the laser are presented. The influence of group-velocity dispersion （GVD） and cavity length on the stability of mode-locking is also discussed.

关键词： fibre laser mode-locking ytterbium

Mechanism and elimination of spectrum filtering in a high power mode-locked fibre laser with a free output coupler

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Chinese Physics B 2010年第1期19卷 355-360页

作者：张玉颖张驰胡明列王思佳宋有建柴路王清月 Ultrafast laser Lab School of Precision Instruments and Optoelectronics EngineeringKey Laboratory of Optoelectronic Information Technical ScienceTianjin University

The filtering mechanism of a free output coupler mode-locked laser based on large-mode-area photonic-crystal fibre is analysed. A filtering-soliton mode-locked laser with 495 fs pulse width and 21 nJ pulse energy is achieved. Another novel cavity configuration is established to eliminate the filtering effect. Pulses, each 457 fs in width and 16.5 nJ in energy, are obtained in a soliton-like regime. Pulses, each 387 fs in width and 15.8 nJ in energy, are also generated in a stretched pulse regime and could be dechirped to 119 fs externally to the cavity.

关键词： femtosecond laser mode-locked laser fibre laser large-mode-area photonic-crystal fibre

High-power linear-polarization burst-mode all-fibre laser and generation of frequency-adjustable microwave signal

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High Power laser Science and Engineering 2021年第2期9卷 1-7页

作者： Xuan He Bin Zhang Shuailin Liu Jinmei Yao Qilin Wu Yuxin Zhao Tao Xun Linyong Yang Jing Hou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha410073China State Key Laboratory of Pulsed Power laser Technology Changsha410073China Hunan Provincial Key Laboratory of High Energy laser Technology Changsha410073China

Narrowband microwave generation with tuneable frequency is demonstrated by illuminating a photoconductive semiconductor switch(PCSS)with a burst-mode fibre *** whole system is composed of a high-power linearly polarized burst-mode pulsed fibre laser and a linear-state *** obtain a high-performance microwave signal,a desired envelope of burst is necessary and a pulse pre-compensation technique is adopted to avoid envelope distortion induced by the gain-saturation *** from the technique,homogenous peak power distribution in each burst is *** maximum energy of the laser burst pulse reaches 200μJ with a burst duration of 100 ns at the average power of 10 W,corresponding to a peak power of 4 *** the PCSS is illuminated by the burst-mode fibre laser,narrowband microwave generation with tuneable frequency(0.80-1.12 GHz)is obtained with a power up to 300 *** the best of the authors’knowledge,it is the first demonstration of frequency-tuneable narrowband microwave generation based on a fibre *** high-power burst-mode fibre laser reported here has great potential for generating high-power arbitrary microwave signals for a great deal of applicable demands such as smart adaptive radar and intelligent high-power microwave systems.

关键词： burst-mode pulse fibre laser linear polarization microwave signal

Long Cavity Length Composite Cavity fibre laser with Single Longitudinal Mode and Narrow Linewidth

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Long Cavity Length Composite Cavity Fibre Laser with Single ...

Different operation states of soliton pulses in an erbium-doped fibre ring laser

2007亚洲光电子会议先进的传感系统与应用分会场

作者： Ian Leung Paul A.Childs School of Electrical Engineering and Telecommunications University of New South Wales Sydney NSW 2052 Australia School of Electrical Engineering and Telecommunications University of New South Wales Sydney NSW 2052 Australia

The composite cavity fibre laser （CCFL） is demonstrated for its capability in maintaining single longitudinal mode operation, whilst having longer cavity length than typical distributed Bragg reflector or distributed feedback fibre lasers, and hence also higher output power. These two attributes should enable the CCFL to be useful in sensing applications. A long cavity length CCFL can be fabricated simply by writing three spectrally matched Bragg gratings directly into a continuous length of doped fibre. This is analogous to the use of feedback cavities in semiconductor laser designs to maintain single longitudinal mode. Results from in-house fabrications show that long cavity length CCFLs can be fabricated to have single longitudinal mode and narrow linewidth characteristics similar to that of a distributed feedback fibre laser, and also significantly higher output power.

关键词： fibre laser Long cavity fibre laser Single longitudinal mode fibre sensing

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Chinese Physics B 2007年第7期16卷 1986-1990页

作者：张书敏吕福云龚岩洞杨秀峰 Department of Physics Hebei Normal University Shijiazhuang 050016 China Institute of Physics NankaJ University Tianjin 300071 China Lightwave Department Institute for Infocomm Research (I2R) Singapore

We report on the experimental observation of soliton pulses in an erbium doped fibre ring laser. The passive mode-locking is achieved using the nonlinear polarization rotation technique. By adjusting the pump power and the intracavity polarization controllers, a normal soliton, a stable 8th harmonic mode-locked pulse and a noise-like pulse have been observed in our laser. The experimental results revealed that the noise-like pulse is not suitable for the optical telecommunication, and in order to obtain the stable harmonic mode-locked soliton, a strong unstable CW laser field is necessary to mediate global soliton interaction. The formation mechanism of the harmonic mode-locked pulse has also been analysed.

关键词： fibre laser soliton mode-locking

Passive harmonic mode locked all-normal-dispersion Yb-doped fibre lasers

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Chinese Physics B 2011年第2期20卷 270-274页

作者：孔令杰肖晓晟杨昌喜 State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua University

Passive harmonic mode-locking of dissipative solitons is demonstrated in all-normal dispersion Yb-doped fibre lasers.A difference equation model of the mode-locked fibre lasers is adopted to simulate the intra-cavity nonlinear *** phenomena around the mode-locking threshold,and the effect of introducing linear phase bias are *** passive harmonic mode-locking as one kind of multipulsing operations is ***,the simulation shows the bistability between multipulsing and single-pulse or period multiplication.

关键词： fibre laser mode-locking ytterbium

Switchable and spacing-tunable dual-wavelength erbium-doped fibre lasers

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Chinese Physics B 2005年第4期14卷 779-784页

作者：冯新焕刘艳格孙磊袁树忠开桂云董孝义 InstituteofModernOptics NankaiUniversityTianjin300071China

Two switchable and spacing-tunable dual-wavelength linear cavity erbium-doped fibre lasers are demonstrated experimentally. One of them utilizes a Bragg grating in polarization-maintained PANDA fibre and the other uses a Bragg grating in standard single mode fibre for wavelength selection. Both exploit the birefringence characteristics of the FBG induced by transverse strain. The proposed lasers can be made to operate in stable dual-wavelength or switch between two wavelengths at room temperature just by simple adjustment of a polarization controller. Transverse strain loading on the FBG allows the wavelength spacing to be controlled.

关键词： Erbium-doped fibre fibre Bragg grating fibre laser dual-wavelength lasing polarizationmaintaining fibre

Coherent beam combining of hybrid phase control in master oscillator-power amplifier configuration

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Chinese Physics B 2010年第9期19卷 374-378页

作者：王小林周朴马阎星马浩统许晓军刘泽金赵伊君 College of Optoelectronic Science and Engineering National University of Defense Technology

A novel scalable architecture for coherent beam combining with hybrid phase control involving passive phasing and active phasing in master oscillator-power amplifier configuration is presented. Wide-linewidth mutually injected passive phasing fibre laser arrays serve as master oscillators for the power amplifiers, and the active phasing using stochastic parallel gradient descent algorithm is induced. Wide-linewidth seed laser can suppress the stimulated Brillouin scattering effectively and improve the output power of the fibre laser amplifier, while hybrid phase control provides a robust way for in-phase mode coherent beam combining simultaneously. Experiment is performed by active phasing fibre laser amplifiers with passive phasing fibre ring laser array seed lasers. Power encircled in the main-lobe increases1.57 times and long-exposure fringe contrast is obtained to be 78% when the system evolves from passive phasing to hybrid phasing.

关键词： fibre laser coherent beam combining hybrid phase control stochastic parallel gradient descent algorithm

Passive harmonic mode locked Yb-doped fibre all-normal-dispersion lasers

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Chinese Physics B 2011年第2期20卷 266-270页

作者： Kong Ling-Jie Xiao Xiao-Sheng Yang Chang-Xi State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University Beijing 100084 China

Passive harmonic mode-locking of dissipative solitons is demonstrated in all-normal dispersion Yb-doped fibre lasers. A difference equation model of the mode-locked fibre lasers is adopted to simulate the intra-cavity nonlinear dynamics. Hysteresis phenomena around the mode-locking threshold, and the effect of introducing linear phase bias are discussed. The passive harmonic mode-locking as one kind of multipulsing operations is revealed. Moreover, the simulation shows the bistability between multipulsing and single-pulse or period multiplication.

关键词： fibre laser mode-locking ytterbium