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Wavelength stabilization of a 980-nm semiconductor laser module stabilized with high-power uncooled dual FBG

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Chinese Optics Letters 2011年第3期9卷 57-61页

作者：黄毅泽李毅王海方俞晓静张虎张伟朱慧群周晟孙若曦张宇明 School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai Key Laboratory of Modern Optical Systems Institute of Thin Films and Nanomaterials Wuyi University

An optimized dual fiber Bragg grating （FBG） is proposed for 980-nm semiconductor lasers without thermoelectric coolers to restrict temperature-induced wavelength *** mathematical model of the temperature-induced wavelength shift of the laser with the dual FBG is built using the external cavity feedback rate *** external cavity parameters are optimized for achieving the stability mode-locking laser *** spectral characteristics of the dual FBG stabilized laser are measured to range from 0 to 70 °*** side mode suppression ratio （SMSR） is more than 45 dB,while the full-width at half-maximum （FWHM） is less than 1 *** peak wavelength shift is less than 0.1 *** dual FBG wavelength shift proportional coefficient is between 0.1086 and 0.4342.

关键词： fiber Bragg gratings Laser mode locking lasers Mathematical models Mode locked fiber lasers Optimization Thermoelectric equipment Thermoelectricity

Investigation on mode matching including thermal effects in LD end-pumped passively mode-locked Nd:YVO_4 laser

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Chinese Optics Letters 2010年第10期8卷 1004-1007页

作者：夏帕克提.吾守尔于海娟闫平巩马理 Center for Photonics and Electronics Department of Precision Instruments and Mechanology Tsinghua University

We design a laser diode （LD） end-pumped passively mode-locked solid-state laser with a semiconductor saturable absorber mirror. Mode-matching efficiency in the active medium including the thermal effect is analyzed, and the optimum mode-matching coefficient is obtained by optimizing the pump mode. In the experiment, a total power of 4.2 W stable pulse sequences without multipulse at 1064 nm is obtained with a pulse repetition rate of 86 MHz and a pulse width of 13 ps, corresponding to a high optical to optical efficiency of 44%.

关键词： lasers Mirrors Mode locked fiber lasers Neodymium lasers Pulse repetition rate Pumps Semiconductor lasers

Ultra-broadband optical spectrum generation from a stretched pulse fiber laser utilizing zero-dispersion fiber

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Chinese Optics Letters 2013年第5期11卷 39-42页

作者：张程柴路宋有建胡明列王清月 Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Technical Science of Ministry of EducationCollege of Precision Instruments and Opto-electronics EngineeringTianjin University

We investigate the effects of a piece of zero-dispersion fiber （ZDF） on the pulse dynamics of a passively mode-locked fiber laser operating in the stretched-pulse regime. Numerical simulation suggests that the proper location and length of ZDF facilitate spectrum broadening and pulse shortening in fiber lasers while maintaining constant net cavity dispersion. A nonlinear polarization evolution mode-locked Er-doped fiber laser with a dispersion map is built based on the simulation. Larger optical spectrum broadening is obtained by inserting a longer ZDF after the active fiber during single-pulse operation, which well agrees with the simulation.

关键词： fiber lasers Mode locked fiber lasers Passive mode locking

Pulse dynamics controlled by saturable absorber in a dispersion-managed normal dispersion Tm-doped mode-locked fiber laser

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Chinese Optics Letters 2014年第3期12卷 50-53页

作者：杨小亮陈宇赵楚军张晗 Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education College of Information Science and EngineeringHunan University

Based on the coupled Ginzburg-Landu equation, we numerically investigate the pulse dynamics in a dispersion-managed normal dispersion Tin-doped mode-locked fiber laser. The influences of the rood-ulation depth and saturation power of saturable absorber on the pulse dynamics are presented. The simulation results show that these parameters are crucial to achieve high pulse energy and high pulse peak power pulsed laser near 2-μm wavelength.

关键词： Dispersion (waves) Dispersions fiber lasers Locks (fasteners) Mode locked fiber lasers Saturable absorbers

Dual-output modulation in time-wavelength interleaved photonic analog-to-digital converter based on actively mode-locked laser

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Chinese Optics Letters 2016年第3期14卷 18-22页

作者：张华杰邹卫文杨光陈建平 State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai Key Lab of Navigation and Location Services Shanghai Jiao Tong University

This Letter demonstrates the application of dual-output modulation in a photonic analog-to-digital converter （PADC） with a high sampling rate and resolution. The PADC is time-wavelength interleaved and based on an actively mode-locked laser. According to theoretical analysis, the dual-output PADC system shows a better linearity for achieving a higher dynamic range. In the experiment, third-order distortion is significantly sup- pressed by -40 dB when the dual-output modulator is used and the effective number of bits of the PADC has reached 9.0 bits below 0.2 GHz and 6.4 bits at 6.1 GHz in our PADC with a sampling rate of 20 GS/s.

关键词： Frequency converters lasers Locks (fasteners) Mode locked fiber lasers Modulation

Highly efficient reduced graphene oxide mode-locked Nd:GGG laser

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Chinese Optics Letters 2015年第2期13卷 45-48页

作者：左春华侯佳张百涛何京良 School of Mathematics Qilu University of Technology State Key Laboratory of Crystal Materials Shandong University

We report, for the first time to our knowledge, a diode-end-pumped passively mode-locked（ML） Nd-doped gadolinium gallium garnet laser based on a chemically reduced graphene oxide（RGO） saturable absorber mirror. The ML laser gives a pulse duration of 15.1 ps under the maximum average output power of 1.44 W, corresponding to a slope efficiency of 21.1%. The single-pulse energy and peak power are 21.6 n J and 1.43 k W, respectively. The results indicate that our RGO saturable absorber has promising prospects for applications in high-power and high-efficiency ultrafast lasers.

关键词： Graphene Locks (fasteners) Mode locked fiber lasers Passive mode locking Pumping (laser) Q switched lasers Saturable absorbers Ultrafast lasers

Experimental investigation on Q-switching and Q-switched mode-locking operation in gold nanorods-based erbium-doped fiber laser

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Chinese Optics Letters 2015年第8期13卷 54-58页

作者：汪徐德赵年刘浩汤瑞朱艳芳薛建平罗智超罗爱平徐文成 School of Physics and Electronic Information Huaibei Normal University Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and Engineering South China Normal University School of Life Sciences Huaibei Normal University Guangdong Provincial Key Laboratory of fiber Laser Materials and Applied Techniques South China University of Technology

We report on the generation of Q-switched and Q-switched mode-locked （QML） pulses in an erbium-doped fiber ring laser by using a polyvinyl alcohol （PVA） -based gold nanorod （GNR） saturable absorber （SA）. The PVA- based GNR SA has a modulation depth of -4.8% and a non-saturable loss of -26.9% at 1.5 μm. A Q-switched pulse train with a repetition rate varying from 18.70 to 39.85 kHz and a QML pulse train with an envelope repetition rate tuning from 20.31 to 31.50 kHz are obtained. Moreover, the lasing wavelengths of the Q-switched pulses can be flexibly tuned by introducing a narrow bandwidth, tunable filter into the laser cavity. The results demonstrate that the GNRs exhibit good optical performance and can find a wide range of applications in the field of laser technology.

关键词： Erbium fiber lasers Gold Laser applications Laser mode locking Locks (fasteners) Mode locked fiber lasers Nanoribbons Nanorods Pulse repetition rate Q switched lasers Ring lasers Saturable absorbers

High-Q microwave photonic filter with self-phase modulation spectrum broadening and third-order dispersion compensation

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Chinese Optics Letters 2014年第8期12卷 19-22页

作者：邹丹郑小平李尚远张汉一周炳琨 Tsinghua National Laboratory for Information Science and Techonology Department of Electronic EngineeringTsinghua University

We propose and experimentally demonstrate a scheme of high-Q microwave photonic filter （MPF） using the techniques of self-phase modulation （SPM） spectrum broadening and third-order dispersion （TOD） compensation. The optical pulses from a mode-locking laser are spectrally broadened by the SPM in the highly nonlinear fiber. A wideband optical frequency comb with 365 spectral lines within 10-dB power variation from the highest spectral power is obtained. By applying a cubic phase modulation via a waveshaper, the effect of TOD which broadens the MPF passband is eliminated. The final implemented MPF has a Q-value as high as 296 and a tuning range of 700 MHz.

关键词： Bandpass filters Electromagnetic dispersion Laser mode locking Locks (fasteners) Microwave filters Mode locked fiber lasers Nonlinear optics

Efficient femtosecond optical parametric oscillator pumped by all solid-state mode-locking Yb:YCOB laser

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Chinese Optics Letters 2015年第1期13卷 63-65页

作者：田文龙朱江峰王兆华魏志义 School of Physics and Optoelectronic Engineering Xidian University Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences

We experimentally demonstrate a femtosecond optical parametric oscillator （OPO） synchronously pmnped by a home-made solid-state mode-locking Yb：YCOB laser, which is capable of laser pulse as short as 102 fs and average power of 620 mW at the central wavelength of 1052 nm. By using a periodically poled lithium niobate with tuning of the grating periods from 28.5 to 31.5μm as the nonlinear gain crystal, tunable femtosecond pulses from 1444 to 1683 nm are realized by conveniently adjusting the OPO cavity length with 76.8 MHz repetition rate. The maximum average output power is 152 mW at 1568 nm, corresponding to an idler power of 75 mW at 3197 nm as well as 36.6% total extraction efficiency.

关键词： Electromagnetic pulse Laser mode locking Locks (fasteners) Mode locked fiber lasers Optical parametric oscillators Optical pumping Optically pumped lasers Pulse repetition rate Pumping (laser) Q switched lasers Ytterbium