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Science China(Information Sciences) 2023年第8期66卷 279-280页

作者： Bo HU Han WU Kan TIAN Houkun LIANG College of Electronics and Information Engineering Sichuan University

Continuous-wave(CW) tunable mid-infrared(MIR) laser sources are necessary for laser spectroscopy, remote sensing,and infrared imaging applications [1]. Generally, quantum cascaded lasers(QCLs) are mature MIR radiation sources with decent power. However, the tunning range of QCLs is limited to ten of cm-1. In contrast, difference-frequency generation(DFG) sources based on nonlinear optical crystals have advantages in broad wavelength tunability.

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Simple,stable and efficient nonlinear pulse compression through cascaded filamentation in air

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High Power Laser Science and Engineering 2023年第6期11卷 193-198页

作者： Tao Pu Kan Tian Bo Hu Zhongjun Wan Linzhen He Xuemei Yang Han Wu Yang Li Weizhe Wang Houkun LIANG College of Electronics and Information Engineering Sichuan UniversityChengduChina

Nonlinear compression has become an obligatory technique along with the development of ultrafast lasers in generating ultrashort pulses with narrow pulse widths and high peak power.In particular,techniques of nonlinear compression have experienced a rapid progress as ytterbium(Yb)-doped lasers with pulse widths in the range from hundreds of femtoseconds to a few picoseconds have become mainstream laser tools for both scientific and industrial applications.Here,we report a simple and stable nonlinear pulse compression technique with high efficiency through cascaded filamentation in air followed by dispersion compensation.Pulses at a center wavelength of 1040 nm with millijoule pulse energy and 160 fs pulse width from a high-power Yb:CaAlGdO_(4) regenerative amplifier are compressed to 32 fs,with only 2.4% loss from the filamentation process.The compressed pulse has a stable output power with a root-meansquare variation of 0.2% over 1 hour.

关键词： femtosecond pulse filamentation nonlinear compression

Multigigawatt 50 fs Yb:CALGO regenerative amplifier system with 11 W average power and mid-infrared generation

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Photonics Research 2021年第8期9卷 1439-1445页

作者： WEIZHE WANG HAN WU CHENG LIU BIAO SUN Houkun LIANG College of Electronics and Information Engineering Sichuan UniversityChengdu 610064China Beijing Wave Quanta Technology Co. Ltd.Beijing 102208China Hangzhou Yacto Technology Ltd. Hangzhou 311305China

Lasers with high average and high peak power as well as ultrashort pulse width have been all along demanded by nonlinear optics studies,strong-field experiments,electron dynamics investigations,and ultrafast spectroscopy.While the routinely used titanium-doped sapphire(Ti:sapphire)laser faces a bottleneck in the average power upscaling,ytterbium(Yb)-doped lasers have remarkable advantages in achieving high average power.However,there is still a substantial gap of pulse width and peak power between the Ti:sapphire and Yb-doped lasers.Here we demonstrate a high-power Yb:CaAlGdO4(Yb:CALGO)regenerative amplifier system,delivering 1040 nm pulses with11 W average power,50 fs pulse width,and 3.7 GW peak power at a repetition rate of 43 k Hz,which to some extent bridges the gap between the Ti:sapphire and Yb lasers.An ultrabroadband Yb-doped fiber oscillator,specially designed spectral shapers,and Yb:CALGO gain medium with broad emission bandwidth,together with a double-end pumping scheme enable an amplified bandwidth of 19 nm and 95 fs output pulse width.To the best of our knowledge,this is the first demonstration of sub-100 fs regenerative amplifier based on Yb-doped bulk medium without nonlinear spectral broadening.The amplified pulse is further compressed to 50 fs via cascaded-quadratic compression with a simple setup,producing 3.7 GW peak power,which boosts the record of peak power from Yb:CALGO regenerative amplifiers by 1 order.As a proof of concept,pumped by the high-power,50 fs pulses,7.5–11.5μm midinfrared(MIR)generation via intrapulse difference-frequency generation is performed,without the necessity of nonlinear fiber compressors.It leads to a simple and robust apparatus,and it would find good usefulness in MIR spectroscopic applications.

关键词： amplifier power pumped

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关于多功能户外照明设备的设计与研究

模具制造 2023年第12期23卷 164-166页

作者：梁厚堃广东百创源科技股份有限公司广东阳江529500

针对多功能户外照明设备的设计展开研究,明确了多功能户外照明设备设计原则、功能要求,并围绕户外照明设备的设计展开详细探讨,分别说明了多功能户外照明设备结构、电源、灯具操作和功能设计要点。根据研究结果可知,此次多功能户外照明... 详细信息

针对多功能户外照明设备的设计展开研究,明确了多功能户外照明设备设计原则、功能要求,并围绕户外照明设备的设计展开详细探讨,分别说明了多功能户外照明设备结构、电源、灯具操作和功能设计要点。根据研究结果可知,此次多功能户外照明设备的设计功能较为完善,可以满足户外照明的多功能需求,具有良好应用前景,可以大范围推广。

关键词：多功能户外照明照明设备

Widely tunable continuous-wave visible and mid-infrared light generation based on a dual-wavelength switchable and tunable random Raman fiber laser

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Photonics Research 2023年第5期11卷 808-816页

作者： HAN WU WEIZHE WANG BO HU YANG LI KAN TIAN RUI MA CHUNXIAO LI JUN LIU JIYONG YAO Houkun LIANG College of Electronics and Information Engineering Sichuan UniversityChengdu 610064China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Beijing Center for Crystal Research and Development Key Laboratory of Functional Crystals and Laser TechnologyTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Nonlinear frequency conversion of wavelength agile and high-power random fiber lasers can provide a promising way to generate continuous-wave(CW)visible and mid-infrared(MIR)light with unique properties such as the continuous modeless spectrum,low temporal/spatial coherence,and high temporal stability.Here,we report a dual-wavelength switchable and tunable random Raman fiber laser(RRFL)based on a phosphosilicate fiber that has two Raman gain peaks for the first time and demonstrate its superior capability to generate widely tunable CW visible and mid-infrared light via nonlinear frequency conversions.By using the combination of a tunable pump and two tunable gratings in Littrow configuration that can provide separated point feedback for the two Stokes wavelengths corresponding to silica-and phosphorus-related Raman peaks,the spectrum of an RRFL can be flexibly manipulated for the aim of nonlinear frequency conversions,including single-wavelength tunable emission at the 1.1μm or 1.2μm band for second-harmonic generation(SHG),dual-wavelength simultaneously tunable emission at the 1.1μm and 1.2μm bands for the sum-frequency generation(SFG),and dual-wavelength separation tunable emission for difference-frequency generation(DFG).As a result,with the combination of SHG and SFG in a periodically poled lithium niobate crystal array,we experimentally demonstrate the broadest tuning range(560-630 nm)of visible light generated from an RRFL,to the best of our knowledge.The tunable MIR light in the range of 10.7-12.3μm is also demonstrated through DFG of an RRFL operating in separation tunable dual-wavelength emission mode in a Ba Ga4Se7(BGSe)crystal,which is the first realization of>10μm CW DFG in the BGSe crystal.We believe the developed dual-wavelength switchable and tunable RRFL can provide a new compact,robust,and cost-effective platform to realize broadly tunable light in both the visible and MIR regions,which can also find potential applications in imaging,sensing,and temporal ghost imaging in various spectral bands.

关键词： tunable fiber tuning

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

Dual-Wavelength Spectrum-Shaped Mid-Infrared Pulses and Steering High-Harmonic Generation in Solids

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Ultrafast Science 2023年第3期3卷 19-28页

作者： Linzhen He Weizhe Wang Kan Tian Maoxing Xiang Zhongjun Wan Bo Hu Yang Li Han Wu Zi-Yu Chen Fan Yang Houkun LIANG College of Electronics and Information Engineering Sichuan UniversityChengduSichuan 610064China Key Laboratory of High Energy Density Physics and Technology(MoE) College of PhysicsSichuan UniversityChengdu 610064China. College of Physics Key Laboratory of High Energy Density Physics and Technology of the Ministry of EducationSichuan UniversityChengduSichuan 610064China

Mid-infrared(MIR)ultra-short pulses with multiple spectral-band coverage and good freedom in spectral and temporal shaping are desired by broad applications such as steering strong-field ionization,investigating bound-electron dynamics,and minimally invasive tissue ablation.However,the existing methods of light transient generation lack freedom in spectral tuning and require sophisticated apparatus for complicated phase and noise control.Here,with both numerical analysis and experimental demonstration,we report the first attempt,to the best our knowledge,at generating MIR pulses with dual-wavelength spectral shaping and exceptional freedom of tunability in both the lasing wavelength and relative spectral amplitudes,based on a relatively simple and compact apparatus compared to traditional pulse synthesizers.The proof-of-concept demonstration in steering the high-harmonic generation in a polycrystalline ZnSe plate is facilitated by dual-wavelength MIR pulses shaped in both spectral and temporal domains,spanning from 5.6 to 11.4μm,with multi-microjoule pulse energy and hundred-milliwatt average power.Multisets of harmonics corresponding to different fundamental wavelengths are simultaneously generated in the deep ultraviolet region,and both the relative strength of individual harmonics sets and the spectral shapes of harmonics are harnessed with remarkable freedom and flexibility.This work would open new possibilities in exploring femtosecond control of electron dynamics and light–matter interaction in composite molecular systems.

关键词： synthesizer harmonics apparatus

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

中红外大能量高功率周期量级光学参量啁啾脉冲放大的发展及应用(特邀)

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红外与激光工程 2021年第8期50卷 11-24页

作者：何林珍田坎杨雪梅梁厚昆四川大学电子信息学院四川成都610065

近十年来,超强超短脉冲是激光光学发展的一个重要趋势。尤其是在中红外(MIR)波段,由于中红外波长具有更大的有质动力并且其光谱范围几乎包含了所有分子"指纹"共振峰,这使得中红外激光的研究在强场物理、中红外光谱学、材料加工以及生物... 详细信息

近十年来,超强超短脉冲是激光光学发展的一个重要趋势。尤其是在中红外(MIR)波段,由于中红外波长具有更大的有质动力并且其光谱范围几乎包含了所有分子"指纹"共振峰,这使得中红外激光的研究在强场物理、中红外光谱学、材料加工以及生物医学研究等领域中至关重要。目前已经有许多比较成熟的激光技术可以对脉冲进行整形、放大,例如差频(DFG)、啁啾脉冲放大(CPA)、光学参量放大技术(OPA)以及光学参量啁啾脉冲放大(OPCPA)等。利用OPCPA技术具有的高放大增益、高信噪比、宽增益带宽的优点在高非线性系数的非线性晶体中进行脉冲放大已经成为当前获取超强超短中红外脉冲的主要手段之一。文中总结了利用OPCPA技术在2~20μm波长范围内产生和放大MIR少周期脉冲的研究进展,并对其在强场物理、分子频谱探测以及生物医学方面的应用进行了简要的阐述。

关键词：中红外脉冲超短脉冲光学参量啁啾脉冲放大

E3泛素连接酶RNF165在A亚群禽白血病病毒复制中的作用

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中国畜牧兽医 2023年第9期50卷 3781-3789页

作者：王兴明王后坤陈雪阳方春梁雄燕杨玉莹长江大学动物科学学院荆州434025 荆州职业技术学院荆州434025

【目的】探明鸡源环指蛋白165(ring finger protein 165,RNF165)在A亚群禽白血病病毒(ALV-A)复制中的作用,为进一步研究鸡源RNF165对ALV-A致病性的影响提供参考。【方法】将ALV-A接种于DF-1细胞和1日龄雏鸡,通过Western blotting和实时... 详细信息

【目的】探明鸡源环指蛋白165(ring finger protein 165,RNF165)在A亚群禽白血病病毒(ALV-A)复制中的作用,为进一步研究鸡源RNF165对ALV-A致病性的影响提供参考。【方法】将ALV-A接种于DF-1细胞和1日龄雏鸡,通过Western blotting和实时荧光定量PCR方法分别从体外和体内两个方面验证ALV-A对宿主RNF165表达的影响;参考已公布的RNF165基因序列设计过表达引物,通过PCR扩增RNF165基因,将其克隆至真核表达载体pcDNA3.1;将验证表达的重组质粒转染DF-1细胞,1 d后接种ALV-A,使用Western blotting检测过表达RNF165对病毒复制的影响;最后设计突变引物,构建RNF165功能结构域突变质粒,将过表达质粒和突变质粒分别转染DF-1细胞,1 d后接种ALV-A,Western blotting测定gp85蛋白表达差异。【结果】ALV-A感染DF-1细胞后未能检测到内源性的RNF165蛋白,但基因转录水平较对照组明显下调(P<0.01)。在体内试验中,与对照组相比,感染病毒雏鸡肝脏中RNF165基因和蛋白表达水平均有所下调(P<0.01);通过PCR成功扩增到大小为1068 bp的目的片段并成功克隆至pcDNA3.1,Western blotting结果显示,在39 ku处出现目的条带,RNF165过表达后促进了病毒复制;测序结果显示,成功构建出功能结构域突变质粒,与过表达质粒组相比,RNF165突变质粒组病毒的复制水平受到显著抑制。【结论】ALV-A感染抑制DF-1细胞和雏鸡肝脏RNF165的表达,在体外试验中,过表达RNF165会促进ALV-A的复制,且这种影响与其保守结构域有关。

关键词：环指蛋白165 A亚群禽白血病病毒(ALV-A) 病毒复制功能结构域突变