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npj Flexible Electronics 2022年第1期6卷 410-418页

作者： Ziya Wang Xiuru xu yingtian xu Waner Lin Zhengchun Peng Center for Stretchable Electronics and Nano Sensors School of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Institute of Artificial Intelligence and Robotics for Society(AIRS) Shenzhen 518129China Department of Micro-Nano Electronics School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Epidermal sensing devices,which mimic functionalities and mechanical properties of natural skin,offer great potential for real-time health monitoring via continuous checking of vital ***,most existing skin-mounted electronics use a flexible film with high elastic modulus,which hinders physical activity and causes interfacial delamination and skin *** compliance of hydrogel-based devices can firmly conform to complex,curved surfaces without introducing excessive interfacial ***,most hydrogels still suffer from the weakness of stable and reproducible *** this work,we report a skin-friendly epidermal electronic made of a resilient,self-healing,and recyclable polyvinyl alcohol(PVA)*** hydrogel is reinforced through a ternary heterogeneous network for good mechanical robustness while maintaining high stretchability and exceptional ***,the abundant dynamic hydrogen bonds give the hydrogel rapid self-healing *** assembled hydrogel epidermal electronic is able to stably monitor multiple physiological signals as well as sense the strain level of the skin motion and joint *** unique,versatile,environmental and biological friendly epidermal electronics will have broad applications in health care,human-machine interface,augmented reality,and so on.

关键词： strength interfacial ternary

Coupling characteristics of laterally coupled gratings with slots

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Chinese Physics B 2022年第11期31卷 352-357页

作者： Kun Tian Yonggang Zou Linlin Shi He Zhang yingtian xu Jie Fan Hui Tang Xiaohui Ma State Key Laboratory on High Power Semiconductor Lasers Changchun University of Science and TechnologyChangchun 130022China

Laterally-coupled ridge-waveguide distributed feedback lasers fabricated without epitaxial regrowth steps have the advantages of process simplification and low *** present a laterally coupled grating with *** slots etched between the ridge and grating area are designed to suppress the lateral diffusion of carriers and to reduce the influence of the aspect-ratio-dependent-etching effect on the grating morphology in the etching ***,the grating height in this structure can be decreased to lower the aspect ratio significantly,which is advantageous over the conventional laterally coupled ridge waveguide *** effects of five main structural parameters on the coupling characteristics of gratings are studied by MODE *** is found that varying the lateral width of the grating can be used as an effective way to tune the coupling strength;narrow slots(100 nm and 300 nm)and wide ridge(2μm–4μm)promote the stability of grating coupling coefficient and device *** is important to note that the grating bottom should be fabricated *** comparative study of carrier distribution and mode field distribution shows that the introduction of narrow slots can strengthen the competitive advantage and stability of the fundamental mode.

关键词： Bragg gratings distributed feedback(DFB)lasers coupling coefficient mode field distribution

All-fiber erbium-doped dissipative soliton laser with multimode interference based on saturable-reserve saturable hybrid optical switch

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Chinese Physics B 2022年第6期31卷 435-439页

作者： Xin Zhao Renyan Wan Weiyan Li Liang Jin He Zhang Yan Li yingtian xu Linlin Shi Xiaohui Ma National Key Laboratory on High-Power Semiconductor Lasers Changchun University of Science and TechnologyChangchun 130022China

Reverse saturable absorption is essential for the realization of dissipative *** this paper,we introduce reverse saturable absorption by using nonlinear multimode interference(NL-MMI),for the first time,to the best of our knowledge,and obtain a stable dissipative soliton *** adjusting the coupling efficiency from multimode fiber to single mode fiber,the absorption properties of NL-MMI can be switched between saturation and reverse *** dissipative soliton can be obtained with pulse width of 975 fs in the experiment,the 3-dB bandwidth at 1555 nm is 16 nm,and the maximum output power is 11.48 m *** nonlinear absorption optical modulation and high damage threshold characteristics of the NL-MMI based ultrafast optical switch provide a new idea for realizing dissipative solitons.

关键词： multimode interference laser mode-locking abnormal saturable absorption

Vector dynamics of ultrafast cylindrical vector beams in a mode-locked fiber laser

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Chinese Optics Letters 2021年第11期19卷 107-112页

作者： Jiazhu Wang Liang Jin Shangzhi Xie Renyan Wang He Zhang yingtian xu Xin Zhao Yan Li Xiaohui Ma National Key Laboratory on High-power Semiconductor Lasers Changchun University of Science and TechnologyChangchun 130022China

The vector dynamics of solitons are crucial but easily neglected for realizing vortex solitons. In this Letter, we investigate the effect of vector dynamics on cylindrical vector beams(CVBs) implementation and propose a novel technical method to realize femtosecond CVBs based on vector-locked solitons, which are presented as group-velocity-locked vector solitons(GVLVSs) in the experiment. The outstanding vector properties of GVLVSs not only greatly improve the efficiency of solitons converted into CVBs and output power of CVBs(2.4 times and 4.1 times that of scalar solitons and vector change periodical solitons, with the purity of 97.2%), but also relax the obstacle of ultrafast CVBs from the fundamental frequency to the harmonic regime(up to 198 MHz) for the first time, to the best of our knowledge. This is the highest repetition rate reported for ultrafast CVBs based on passive mode-locking. The investigation of the influence of solitons vector dynamics evolution on the realization of CVBs provides guidance for the excellent performance of ultrafast CVBs.

关键词： cylindrical vector beam ultrafast optical switch laser mode-locking

Harmonic mode-locked fiber laser based on microfiber-assisted nonlinear multimode interference

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Chinese Optics Letters 2022年第1期20卷 12-16页

作者： Renyan Wang Liang Jin Jiazhu Wang Shangzhi Xie Xiaohui Li yingtian xu He Zhang Xin Zhao Xiaohui Ma National Key Laboratory of High-power Semiconductor Lasers Changchun University of Science and TechnologyChangchun 130022China

A novel harmonic mode-locked fiber laser based on nonlinear multimode interference(NL-MMI) in a microfiber-assisted ultrafast optical switch is proposed in this *** microfiber-assisted ultrafast optical switch can be obtained by tapering the splicing point of the graded-index multimode fiber(GIMF) and single-mode fiber,which not only helps to shorten the self-imaging period in GIMF to relax the strict requirement of NL-MMI on the length of multimode fiber,but also improves the harmonic *** the experiment,with the waist diameter of ~15 μm,the repetition rates of the fiber laser can be stably locked at 285 MHz,corresponding to the 16 th-order harmonic mode-locking,with the pulse duration of 1.52 *** results provide novel insight into the design of a high-repetition-rate laser and the application of microfibers in the modelocking device.

关键词： multimode interference optical fiber devices laser mode-locking

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基于半导体激光器堆栈的光纤耦合技术

中国激光 2017年第11期44卷 29-34页

作者：于贺马晓辉赵鑫邹永刚徐英添徐莉张贺长春理工大学高功率半导体激光国家重点实验室吉林长春130022

由于半导体激光器快慢轴方向的光束质量相差较大,为完成半导体激光器堆栈的光纤耦合,通常采用棱镜堆对光束进行整形。提出一种先填充快轴方向暗区、后旋转重排的光束整形技术,基于棱镜内部的全反射和平行平板对光束的偏移作用,在不使用... 详细信息

由于半导体激光器快慢轴方向的光束质量相差较大,为完成半导体激光器堆栈的光纤耦合,通常采用棱镜堆对光束进行整形。提出一种先填充快轴方向暗区、后旋转重排的光束整形技术,基于棱镜内部的全反射和平行平板对光束的偏移作用,在不使用棱镜堆的情况下完成了整个光束的整形过程。所提技术可将8个巴条组成的半导体激光器堆栈耦合到芯径为200μm、数值孔径为0.22的光纤中,输出功率可达544.47 W,系统的光-光转换效率达到85%。

关键词：激光器光纤耦合光束整形棱镜全内反射半导体激光器堆栈平行平板

基于溶胶凝胶法制备的CuCr_(1-x)Mg_(x)O2/ZnO纳米棒紫外光电探测器

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光学学报 2022年第14期42卷 186-193页

作者：胡韩飞徐英添李莉许崇阳景圆圆刘扬张贺金亮长春理工大学高功率半导体激光国家重点实验室吉林长春130022

报道了一种由ZnO纳米棒和CuCr_(1-x)Mg_(x)O_(2)薄膜组成的新型紫外光电探测器。采用溶胶凝胶法制备CuCr_(1-x)Mg_(x)O_(2)薄膜后在水热条件下生长ZnO纳米棒,然后使用扫描电子显微镜、X射线衍射仪以及分光光度计对CuCr_(1-x)Mg_(x)O_(2)... 详细信息

报道了一种由ZnO纳米棒和CuCr_(1-x)Mg_(x)O_(2)薄膜组成的新型紫外光电探测器。采用溶胶凝胶法制备CuCr_(1-x)Mg_(x)O_(2)薄膜后在水热条件下生长ZnO纳米棒,然后使用扫描电子显微镜、X射线衍射仪以及分光光度计对CuCr_(1-x)Mg_(x)O_(2)/ZnO的形貌、结构和吸收特性进行表征,研究了CuCrO_(2)/ZnO和CuCr_(1-x)Mg_(x)O_(2)/ZnO探测器的紫外光电探测性能。紫外探测实验结果表明:该探测器具有快速响应特性,在-10 V测试电压下的光暗电流比约为CuCrO_(2)/ZnO的2.6倍,响应度相比CuCrO_(2)/ZnO提高了2.3 A/W。CuCr_(1-x)Mg_(x)O_(2)/ZnO探测器具有优良的探测性能,而且制备工艺简单,成本低,可批量生产,是一种性能优良的光电探测器,在紫外检测方面具有多种应用。

关键词：探测器 Mg^(2+)掺杂溶胶凝胶法响应度光暗电流比

倾斜波导半导体激光器内基侧模的“之”字形谐振条件

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红外与激光工程 2024年第6期53卷 81-89页

作者：虞顺超宫梓傲邹永刚徐英添范杰长春理工大学重庆研究院重庆401120

倾斜波导半导体激光器具有独特的谐振光路,基侧模在倾斜波导内满足“之”字形振荡,可有效抑制广域激光器中的高阶侧模激射和灯丝效应。目前倾斜波导半导体激光器大多采用强折射率导引设计,其“之”字形谐振腔长仅由几何关系确定,在弱折... 详细信息

倾斜波导半导体激光器具有独特的谐振光路,基侧模在倾斜波导内满足“之”字形振荡,可有效抑制广域激光器中的高阶侧模激射和灯丝效应。目前倾斜波导半导体激光器大多采用强折射率导引设计,其“之”字形谐振腔长仅由几何关系确定,在弱折射率导引下谐振条件存在一定偏移。为此,基于静态相位法引入古斯-汉欣位移因子,给出了一种适用于两种折射率导引情况的理论模型。对比分析表明,数值计算的结果与两种折射率引导下的仿真结果吻合较好,能更准确地满足弱折射率引导下倾斜波导内基侧模的“之”字形谐振。理论分析同时表明,m阶侧模存在相应的临界刻蚀深度,在基侧模临界刻蚀深度附近,倾斜波导表现出更强的模式选择能力。

关键词：半导体激光器倾斜波导静态相位法侧模调控

双梯形多模干涉耦合器用于提高半导体激光器电光效率

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中国激光 2024年第14期51卷 100-108页

作者：宫梓傲虞顺超邹永刚徐英添范杰长春理工大学高功率半导体激光国家重点实验室吉林长春130022 长春理工大学重庆研究院重庆401122

设计并制作了一种含有双梯形多模干涉(DT-MMI)耦合器结构的有源MMI半导体激光器(DTM-LD)。基于双梯形MMI多模波导的自映像分布重构效应,该激光器在保持与传统矩形有源MMI激光器(MMI-LD)相同有源区面积的同时,具有更短的器件腔长,有利于... 详细信息

设计并制作了一种含有双梯形多模干涉(DT-MMI)耦合器结构的有源MMI半导体激光器(DTM-LD)。基于双梯形MMI多模波导的自映像分布重构效应,该激光器在保持与传统矩形有源MMI激光器(MMI-LD)相同有源区面积的同时,具有更短的器件腔长,有利于器件电光转换效率的提升。实验制得了双梯形底宽为15μm、腰宽为30μm的DTM-LD器件。在保持有源面积约为3.33×10^(4)μm^(2)的情况下,该激光器件的腔长相比于MMI-LD减小了4.2%。在注入电流为1 A的情况下,DTM-LD的电光转换效率由14.5%提升至16.3%,相对提升了12.4百分点,同时其最高输出功率由355 mW小幅提升至360 mW。当MMI多模波导的宽度减小0.5μm时,相比于MMI-LD,DTM-LD的输出功率损耗由51 mW减小至40 mW,降低了21.6%,这表明DTM-LD具有较低的制造误差敏感性。

关键词：半导体激光器 MMI耦合器双梯形电光转换效率

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半导体激光可调谐局域空心光束

中国激光 2018年第11期45卷 182-188页

作者：杨智焜马晓辉房俊宇金亮徐英添张贺长春理工大学高功率半导体激光国家重点实验室吉林长春130022

为实现局域空心光束的可调谐性,以半导体激光器作为光源,采用贝塞尔光束聚焦法来获得局域空心光束。采用平凸柱透镜和梯度折射率透镜对光束进行整形,以获得发散角可变的激光束,进而得到尺寸可调谐的局域空心光束。数值模拟结果表明,当... 详细信息

为实现局域空心光束的可调谐性,以半导体激光器作为光源,采用贝塞尔光束聚焦法来获得局域空心光束。采用平凸柱透镜和梯度折射率透镜对光束进行整形,以获得发散角可变的激光束,进而得到尺寸可调谐的局域空心光束。数值模拟结果表明,当照射在轴棱锥上的光束发散角在0°～1.5°范围内连续变化时,局域空心光束的最大径向尺寸在90.23～64.05μm之间可调谐,而局域空心光束的长度在1.85～1.47 mm之间变化。可调谐局域空心光束可显著增加光镊技术的应用灵活性。

关键词：激光技术光束整形发散角可变贝塞尔光束局域空心光束