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Optically pumped wavelength-tunable lasing from a GaN beam cavity with an integrated Joule heater pivoted on Si

Chinese Physics B 2023年第5期32卷 478-484页

作者：秦飞飞孙阳杨颖李欣王旭卢俊峰王永进朱刚毅 GaN Optoelectronic Integration International Cooperation Joint Laboratory of Jiangsu Province College of Telecommunications and Information EngineeringNanjing University of Posts and TelecommunicationsNanjing 210003China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications Ministry of Education)Nanjing 210003China Department of Microelectronic Science and Engineering School of Physical Science and TechnologyNingbo UniversityNingbo 315211China College of Physics Nanjing University of Aeronautics and AstronauticsNanjing 211106China

Dynamically tunable laser sources are highly promising for realizing visionary concepts of integrated photonic circuits and other applications. In this paper, a Ga N-based laser with an integrated PN junction heater on Si is *** photoluminescence properties of the Ga N beam cavity are controlled by temperature, and the Joule heater provides electrically driven regulation of temperature. These two features of the cavity make it possible to realize convenient tuning of the lasing properties. The multi-functional Ga N beam cavity achieves optically pumped lasing with a single mode near 362.4 nm with a high Q-factor of 1394. The temperature of this device increases by 0–5℃ under the Joule heating effect. Then, electrical control of the lasing mode is demonstrated. The lasing resonant peak shows a continuous redshift of about 0.5 nm and the device also exhibits dynamic switching of its lasing mode. The lasing modulation can be ascribed to temperature-induced reduction of the bandgap. Our work may be of benefit for external optical modulation in future chip-based optoelectronic devices.

关键词： GaN beam cavity optically pumped lasing dynamically tunable laser source Joule heater

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Coupled dielectric-metal subwavelength gratings for terahertz polarization converter and one-way transmission

Coupled dielectric-metal subwavelength gratings for terahert...

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optoelectronics and Communications Conference, OECC

作者： Shi-Tong Xu Fei Fan Xiang-Hui Wang Sheng-Jiang Chang Key Laboratory of Optical Information Science and Technology Nankai University Tianjin Tianjin China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin Tianjin China

A dielectric-metal double layer grating structure is proposed for high performance of polarization converter and one-way transmission in the terahertz (THz) region. The results show that this composite grating structure achieves a high polarization conversion of 90% and a broadband one-way transmission with an extinction nearly 30dB from 0.2 to 1.2THz. It provides a simple way towards practical applications for THz polarization control and one-way transmission.

关键词： Gratings Metals Dielectrics Polarization Broadband communication Silicon Wires

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Remote sensing of trace Na element in sea salt aerosol with a sensitivity level of 10 pg/m^(3)[Invited]

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Chinese Optics Letters 2024年第9期22卷 26-30页

作者： Yuezheng Wang Jiayun Xue Nan Zhang Lu Sun Binpeng Shang Jiewei Guo Zhi Zhang Pengfei Qi Lie Lin Weiwei Liu Institute of Modern Optics Eye InstituteNankai UniversityTianjin 300350China Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Tianjin 300350China School of Integrated Circuit Science and Engineering Tianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China

We have developed a remote sea salt aerosol fluorescence spectroscopy system integrating a high-power industrial-grade femtosecond laser to enhance detection sensitivity and precision in complex *** system successfully detects sea salt aerosol particles,achieving a detection limit of 0.015 ng/m^(3) for neutral Na element(Na I)at 589 nm,with a detection range of 30 *** findings demonstrate significant improvements in remote aerosol monitoring,addressing previous challenges in long-range and high-precision sensing with a detection accuracy previously unattainable below 10 ng/m^(3).

关键词： femtosecond laser filamentation sea salt aerosol remote sensing amplified spontaneous emission

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Generation and reconfiguration of interference-pattern helico-conical beams

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Chinese Optics Letters 2024年第9期22卷 42-47页

作者： Dongye Xu Shaoxiang Duan Xingyu Mao Wenmin Ren Yuan Yao Wei Lin Hao Zhang Bo Liu Institute of Modern Optics College of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai UniversityTianjin 300350China Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Nankai UniversityTianjin 300350China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China

We proposed an approach for the generation of interference-pattern helico-conical beams(HCBs)both theoretically and *** HCBs exhibiting intricate fringe structures are obtained by exploiting amplitude modulation and interference *** precisely control the optical field distributions,we manipulate the azimuthal term within the helicoconical phase expression,presenting several illustrative cases that highlight the versatility of our *** further combinations,more sophisticated comprehensive HCB patterns are *** study deepens our knowledge about spiral-like optical patterns and paves a new avenue for potential applications,especially in the fields of particle manipulation,nanostructure fabrication,and optical metrology.

关键词： helico-conical beams optical field manipulation orbital angular momentum optical interference

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Self-temperature compensation approach for fiber specklegram magnetic field sensor based on polarization specklegram analysis 27

Self-temperature compensation approach for fiber specklegram...

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27th International Conference on Optical Fiber sensors, OFS 2022

作者： Hu, Shicheng Liu, Haifeng Liu, Bo Lin, Wei Zhang, Hao Song, Binbin Wu, Jixuan Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Institute of Modern Optics Nankai University Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics Nankai University Tianjin300350 China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai519000 China Key Laboratory of Computer Vision and Systems School of Computer Science and Engineering Tianjin University of Technology Ministry of Education Tianjin300384 China Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems College of Electronic and Information Engineering Tianjin Polytechnic University Tianjin300387 China

We proposed a self-temperature-compensation approach for fiber specklegram sensor (FSS) based on polarization specklegram analysis, and designed a fiber specklegram magnetic field sensor with high stability and good r... 详细信息

ISBN: (纸本)9781957171142

关键词： Polarization

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Wafer-level substrate-free YIG single crystal film for a broadband tunable terahertz isolator

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Photonics Research 2024年第3期12卷 505-513页

作者： XILAI ZHANG DAN ZHAO DING ZHANG QIANG XUE FEI FAN YULONG LIAO QINGHUI YANG QIYE WEN School of Electronic Science and Engineering State Key Laboratory of Electronic Thin Film and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern OpticsNankai UniversityTianjin 300350China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518110China

Yttrium iron garnet(YIG)is a promising material for various terahertz applications due to its special optical *** present,a high-quality YIG wafer is the desire of terahertz communities and it is still challenging to prepare substrate-free YIG single crystal *** this work,we prepared wafer-level substrate-free La:YIG single crystal films,for the first time,to our *** optical and magneto-optical properties of La:YIG films were characterized by terahertz time domain spectroscopy(THz-TDS).Results show that the as-prepared La:YIG film has an insertion loss of less than 3 dB and a low absorption coefficient of less than10 cm-1below 1.6 *** from the thickness of the substrate-free YIG films and low insertion loss,their terahertz properties could be further manipulated by simply using a wafer-stacking *** four La:YIG films were stacked,there was an insertion loss of less than 10 dB in the range of 0.1-1.2 *** Faraday rotation angle of the four-layer-stacked La:YIG films reached 19°,and the isolation could reach17 *** further increasing the stacking number to eight pieces,a remarkable Faraday rotation angle of45°was achieved with an isolation of 23 dB,which is important for practical application in the THz *** material may provide a milestone opportunity to make various non-reciprocal devices,such as isolators and phase shifters.

关键词： YIG film insertion

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An improved time-domain channel estimation using compressive sensing based on wavelet transform multicarrier modulation system

An improved time-domain channel estimation using compressive...

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International Conference on Computer and Communications (ICCC)

作者： Yuting Zhang Hong Wu Bing Liu Sicong Zhang Yu Zhang Yingxin Zhao Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin China College of Electronic Information and Optical Engineering Nankai University Tianjin China

ISBN: (纸本)9781509063536;9781509063529

Compared with OFDM, wavelet-based multi-carrier modulation system, due to the utilization of wavelet basis to construct the channels, have not only the orthogonal sub-channels but also the orthogonal transmission symbols of each sub-channel, which means it can resist ICI effectively without inserting CP. These characteristics brings great improvement of the system spectrum utilization and makes wavelet-based multi-carrier modulation system get wide attention. But the widespread use of the system is limited by high complexity of its channel estimation technology. In this paper, an improved time-domain channel estimation technique based on compressive sensing is proposed. According to the estimation feature of compressive sensing, pilot symbols are randomly inserted in time-domain, and the number of pilot symbols depends on the channel sparseness. Using the quasi-Toeplitz to construct the observation matrix makes CS channel estimation has better BER performance than traditional method. Furthermore, constructing index set using the received pilot signal and the local pilot by cross-correlation and estimating the number of iterations of the OMP reconstruction algorithm that reduces the number of iterations and the time required for the algorithm under the same reconstruction rate. In general, an improved time-domain CS channel estimation for wavelet transform multi-carrier modulation effectively reduces the system overhead and improves the precision of spectrum utilization, greatly improves the accuracy of channel estimation.

关键词： Channel estimation Wavelet transforms Modulation Time-domain analysis OFDM Finite impulse response filters

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Self-temperature compensation approach for fiber specklegram magnetic field sensor based on polarization specklegram analysis 8

Self-temperature compensation approach for fiber specklegram...

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8th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Hu, Shicheng Liu, Haifeng Liu, Bo Lin, Wei Zhang, Hao Song, Binbin Wu, Jixuan Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology Institute of Modern Optics Nankai University Tianjin300350 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics Nankai University Tianjin300350 China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai519000 China Key Laboratory of Computer Vision and Systems Ministry of Education School of Computer Science and Engineering Tianjin University of Technology Tianjin300384 China Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems College of Electronic and Information Engineering Tianjin Polytechnic University Tianjin300387 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

In this letter, we proposed a self-temperature-compensation approach for fiber specklegram sensor (FSS) based on polarization specklegram analysis. The temperature compensation is achieved by comparing the variation difference of the two specklegrams with vertical linear polarization state. We designed a fiber specklegram magnetic field sensor employing this method and the magneto-birefringence effect of magnetic fluid. The measurement of magnetic field with high stability and good repeatability has been successfully achieved, which demonstrated the effectiveness of the proposed method. Due to the merits of low cost, ease of implement and system simplicity, the proposed method can promote the practical use of the FSS in long term monitoring. © 2022 SPIE

关键词： Polarization

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2 μm Broadband Cylindrical Vector Mode Converter Based on Long-Period Fiber Grating

2 μm Broadband Cylindrical Vector Mode Converter Based on L...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Mao Feng Yange Liu Zhi Wang Baiwei Mao Hongwei Zhang Jiangyong He Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology and lnstitute ofModem Optics Nankai University Tianjin P. R. China

We report a 2 μm broadband mode converter based on long-period fiber grating, whose 10 dB bandwidth is ~43 nm. Cylindrical vector modes, TE 01 and TM 01 modes, were generated by using this mode converter.

ISBN: (纸本)9781943580705

关键词： Fiber lasers Long period gratings Mode conversion Single mode fibers Thulium doped fiber lasers Wavelength division multiplexers

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Transition between optical turbulence and dissipative solitons in a complex Ginzburg-Landau equation with quasi-cw noise

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Physical Review A 2021年第4期103卷 043515-043515页

作者： Ruijing He Jiangyong He Caiyun Li Luhe Zhang Longfei Zhu Mengjie Zhou Kaiyan Zhu Yange Liu Yang Yue Zhi Wang Shanghai Institute of Laser Plasma China Academy of Engineering Physics Shanghai 201800 China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology and Institute of Modern Optics Nankai University Tianjin 300350 China

Noise-induced phase transition between chaos and ordered states plays an important role in the self-organization of dissipative structures. Here, we numerically simulate the phase transitions between statistically stationary regimes in a laser cavity by using a stochastic complex cubic-quintic Ginzburg-Landau equation with a phase-diffusion model. Depending on the linear and nonlinear gains, the dissipative system converges from the initial noise floor to different regimes, including continuous wave, phase turbulence, amplitude turbulence (AT), and stable soliton structure. Around the regime boundaries, we found that only certain phase noise can cause the instability of phase turbulence. The defects formed due to the noise will continue to spread out and self-organize to form AT or stabilize the soliton structure in the defect area. Our results are helpful in understanding the dynamics of the buildup of mode locking and noiselike pulses in passively mode-locked lasers.

关键词： Nonlinear optics Optical chaos Optical solitons Turbulence Chaos & nonlinear dynamics

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