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Burst-Mode Nd: YAG/Cr⁴⁺:YAG Laser With Tunable Pulse Chain Sequence and Intervals 具有可调脉冲链序列和间隔的脉冲串模式 Nd:YAG/Cr⁴⁺:YAG 激光器
IF 2.2 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-26 DOI: 10.1109/JQE.2024.3468999
Nihui Zhang;Di Xin;Zhenjiao Shan;Fengxin Dong;Xuyan Zhou;Hongbo Zhang;Wanhua Zheng
We employed 808 nm and 885 nm pumping sources for time-shared pumping of the compact Nd:YAG/Cr4+:YAG passively Q-switched laser by incorporating time and sequence modulation functions into the electrical modulation signals. Through adjusting the pumping peak powers and pulse widths of the two pump sources, various burst-mode lasers were realized. The repetition frequency and time intervals between pulse chain sequences, as well as the intervals between sub-pulses within a sequence, could be adjustable, addressing the challenge of precise timing control in burst-mode lasers. The time-shared pumping Q-switched laser displayed significantly better controllable pulse characteristic compared to the conventional single-pulse output mode of burst-mode lasers. In conclusion, this work has effectively expanded the application scope of burst-mode lasers, representing a novel contribution to the field.
通过在电调制信号中加入时间和序列调制功能,我们采用 808 nm 和 885 nm 泵浦源对紧凑型 Nd:YAG/Cr4+:YAG 被动 Q 开关激光器进行分时泵浦。通过调整两个泵浦源的泵浦峰值功率和脉冲宽度,实现了各种猝发模式激光器。脉冲链序列之间的重复频率和时间间隔,以及序列内子脉冲之间的时间间隔均可调整,从而解决了猝发模式激光器中精确定时控制的难题。与猝发模式激光器的传统单脉冲输出模式相比,分时抽运 Q 开关激光器显示出明显更好的可控脉冲特性。总之,这项工作有效地拓展了猝发模式激光器的应用范围,为该领域做出了新的贡献。
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引用次数: 0
Numerical Analysis of Relative Intensity Noise of Distributed-Feedback Fiber Lasers Considering Spatial Mode Profile 考虑空间模式轮廓的分布式反馈光纤激光器相对强度噪声数值分析
IF 2.2 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-26 DOI: 10.1109/JQE.2024.3468998
Xuanchen Guo;Yinyang Pei;Jianzhong Zhang
The spatial mode profile of distributed feedback (DFB) lasers is a unique characteristic that distinguishes them from lasers based on F-P cavities. It is utilized to achieve single-mode operation and improve relative intensity noise (RIN) performance. The effective cavity length method, as an approximate method for spatial mode profiling, is conveniently used for theoretical analysis. In this paper, the RIN of DFB fiber lasers was analyzed by considering their spatial mode profile without any approximations, and the results were compared with experimental findings. Additionally, numerical simulations of DFB fiber lasers with different structures were conducted to analyze their noise characteristics and the impact of spatial mode profile on the RIN of the lasers was discussed. The spatial mode profile was solved using the shooting method, with boundary conditions provided based on the erbium ion gain model. The spatial mode profile was then substituted into the RIN expression, yielding the RIN of DFB lasers influenced by spatial mode profile. This physical model is widely applicable and can be used to effectively analyze the dynamic characteristics of most DFB fiber laser structures.
分布式反馈(DFB)激光器的空间模式轮廓是其区别于基于 F-P 腔的激光器的独特特征。利用它可以实现单模运行并改善相对强度噪声(RIN)性能。有效腔长方法作为空间模式剖析的近似方法,可方便地用于理论分析。本文通过不考虑任何近似值的空间模式剖面分析了 DFB 光纤激光器的 RIN,并将结果与实验结果进行了比较。此外,还对不同结构的 DFB 光纤激光器进行了数值模拟,以分析其噪声特性,并讨论了空间模式剖面对激光器 RIN 的影响。空间模式轮廓采用射击法求解,并根据铒离子增益模型提供了边界条件。然后将空间模式剖面代入 RIN 表达式,得出受空间模式剖面影响的 DFB 激光器 RIN。该物理模型具有广泛的适用性,可用于有效分析大多数 DFB 光纤激光器结构的动态特性。
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引用次数: 0
Laser Cavity Analysis Method Considering Dynamic Change of Thermal Lens Effect 考虑热透镜效应动态变化的激光腔分析方法
IF 2.2 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-26 DOI: 10.1109/JQE.2024.3468994
Yuko Kono;Shigeyuki Takagi
We have developed an experimental method for estimating the thermal lens effect of a Nd:YAG rod during laser oscillation in a high-power pulsed laser. By combining a stability analysis by cavity simulation with the change in the focal length of the rod and the beam quality according to the input, we were able to correct the reduction of the thermal effect on the rod due to laser oscillation. The proposed method makes it possible to design a resonator that appropriately considers the stability of the resonator that changes in accordance with the input power.
我们开发了一种实验方法,用于估算高功率脉冲激光器中 Nd:YAG 棒在激光振荡过程中的热透镜效应。通过将空腔模拟稳定性分析与棒焦距和光束质量随输入的变化相结合,我们能够纠正激光振荡导致的棒热效应降低。所提出的方法使设计谐振器时适当考虑谐振器随输入功率变化而变化的稳定性成为可能。
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引用次数: 0
Ultra-Compact, Fully Packaged Broadband Thin-Film Lithium Niobate Modulator for Microwave Photonics 用于微波光子学的超小型全封装宽带铌酸锂薄膜调制器
IF 2.2 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-18 DOI: 10.1109/JQE.2024.3462950
Jinye Li;Dechen Li;Peng Wang;Jinming Tao;Run Li;Qianqian Jia;Jianguo Liu
Broadband, compact electro-optic modulator is one of the key components in optical communication networks and microwave photonic systems. Here, this paper reports a thin-film lithium niobate electro-optic modulator with a 3 dB electro-optic bandwidth greater than 50 GHz after encapsulation, and discusses the electro-optic response and thermo-optic phase-shifting performance of the device. The modulator chip has a 3 dB electro-optic bandwidth greater than 67 GHz, and the fully encapsulated device has a small size (31 mm $times 10$ mm $times 5.3$ mm) while having a high electro-optic bandwidth of up to 51 GHz and an excellent half-wave voltage length product as low as 2.5 V $cdot$ cm. The DC bias is thermally shifted with a 2.3V half-wave voltage for reliable and stable bias characteristics.
宽带、紧凑型电光调制器是光通信网络和微波光子系统的关键部件之一。本文报告了一种薄膜铌酸锂电光调制器,其封装后的 3 dB 电光带宽大于 50 GHz,并讨论了该器件的电光响应和热光移相性能。该调制器芯片的3 dB电光带宽大于67 GHz,完全封装后的器件体积小(31 mm×10 mm×5.3 mm),电光带宽高达51 GHz,半波电压长度积低至2.5 V cm。直流偏压采用 2.3V 半波电压热偏移,具有可靠稳定的偏压特性。
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引用次数: 0
Enhanced Spectrally Selective Terahertz Detection in a Photo-Thermoelectric Graphene Detector With Dual Nano-Grating Gates 带双纳米光栅的光热电石墨烯探测器的增强型光谱选择性太赫兹探测功能
IF 2.2 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-18 DOI: 10.1109/JQE.2024.3462953
Faramarz Alihosseini;Hesam Zandi
We introduce a high-performance terahertz detector based on the photo-thermoelectric effect (PTE) in graphene. Our study outlines a novel approach to enhance terahertz detection through a photodetector that employs a hybrid structure. This structure combines the localized surface plasmon resonance of dual grating gates with the resonant modes of a Fabry-Perot cavity configuration, facilitating a strong interaction between terahertz light and the active graphene layer, thereby improving light absorption. Our numerical investigation reveals frequency selectivity within the terahertz absorptance spectrum for incident waves with transverse magnetic polarization, leading to near-perfect absorptance of graphene. This substantial absorption creates an amplified thermal gradient across the graphene channel due to localized heat generation from terahertz wave absorption. The detector’s absorption characteristics can be adjusted by altering geometrical parameters and tuning two gate voltages. Furthermore, incorporating dual grating gates to create a pn-junction leads to a non-uniform Seebeck coefficient along the channel, enhancing the generated voltage. At a resonant frequency of 1.6 THz, the detector demonstrates a responsivity of 1.26 V/W and a noise-equivalent power (NEP) of $5.2 mathrm {nW}/sqrt {mathrm {Hz}}$ at room temperature, under biasing the two grating gates with the low voltages of ±0.2 V.
我们介绍了一种基于石墨烯光热电效应(PTE)的高性能太赫兹探测器。我们的研究概述了一种通过采用混合结构的光电探测器增强太赫兹检测的新方法。这种结构将双光栅栅极的局部表面等离子体共振与法布里-珀罗腔配置的共振模式相结合,促进了太赫兹光与活性石墨烯层之间的强烈相互作用,从而改善了光吸收。我们的数值研究揭示了太赫兹吸收光谱对横向磁极化入射波的频率选择性,从而使石墨烯具有近乎完美的吸收能力。由于太赫兹波吸收产生的局部热量,这种大量吸收在石墨烯通道上形成了一个放大的热梯度。探测器的吸收特性可以通过改变几何参数和调整两个栅极电压来调整。此外,采用双光栅栅极创建 pn 结会导致通道沿线的塞贝克系数不均匀,从而提高产生的电压。在 1.6 太赫兹的谐振频率下,该探测器在室温条件下,在两个光栅栅极±0.2 V 的低电压偏置下,响应率为 1.26 V/W,噪声等效功率(NEP)为 5.2 mathrm {nW}/sqrt {mathrm {Hz}}$。
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引用次数: 0
Mode-Locking and Q-Switching in Holmium Doped Fiber Laser Using Topological Insulator (Sb₂Te₃) as Saturable Absorber 使用拓扑绝缘体 (Sb2Te3) 作为饱和吸收体的掺钬光纤激光器中的模式锁定和 Q 开关
IF 2.2 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-09 DOI: 10.1109/JQE.2024.3456073
H. Ahmad;K. Kamaruzzaman;M. Z. Samion
This work demonstrates mode-locking and Q-switching in a holmium-doped fiber laser (HDFL) using topological insulator (TI) antimony telluride (Sb2Te3) as the saturable absorber (SA). The TI was drop-casted on an arc-shaped fiber to generate mode-locked pulses and used in thin-film form to generate Q-switched pulses. The mode-locked pulses obtained were centered at 2081.1 nm with a repetition rate of 13.4 MHz, signal-to-noise ratio of 42 dB, and 1.85 ps pulse width. The Q-switched pulses were generated at the center wavelength of 2086.3 nm within the pump power of 1.55 W until 1.80 W. Within this range, the repetition rate peaked at 50.76 kHz and the pulse width dropped to a minimum value of $2.64~mu $ s. To the best of the author’s knowledge, this is the first work to use a topological insulator in an HDFL to generate both mode-locked and Q-switched pulses.
这项研究利用拓扑绝缘体(TI)碲化镉锑(Sb2Te3)作为可饱和吸收体(SA),演示了掺钬光纤激光器(HDFL)中的锁模和调 Q 开关。将拓扑绝缘体滴铸在弧形光纤上以产生锁模脉冲,并以薄膜形式用于产生 Q 开关脉冲。获得的锁模脉冲以 2081.1 nm 为中心,重复频率为 13.4 MHz,信噪比为 42 dB,脉冲宽度为 1.85 ps。据作者所知,这是首次在 HDFL 中使用拓扑绝缘体同时产生锁模脉冲和 Q 开关脉冲。
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引用次数: 0
Frequency Modulation Nonlinear Correction and Ranging in FMCW LiDAR FMCW 激光雷达中的调频非线性校正与测距
IF 2.2 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-05 DOI: 10.1109/JQE.2024.3454604
Yuchen Jiang;Miao Hu;Mengmeng Xu;Haozhen Li;Xuefang Zhou;Meihua Bi;Sunqiang Pan;Chong Liu
The linearity of the laser frequency modulation is a crucial factor that affects the performance of the frequency-modulated continuous wave (FMCW) LiDAR ranging. Nonlinearity can influence ranging resolution and introduce errors. This paper proposes a method for correcting frequency modulation nonlinearity based on waveform preprocessing for the modulation signal of the laser. After correction, the residual nonlinearity (1-r2) of the laser is reduced to $1.85times 10^{-4}$ for the up-sweeping and $8.47times 10^{-4}$ for the down-sweeping using the modulation signal with the repetition frequency of 50 kHz. The full-width at half of the maximum (FWHM) of the spectrum decreases by 86% compared to pre-correction, resulting in the ranging error of 0.37% at the distance of 38 cm. With distances of 0.90 m, 1.80 m, 2.89 m, and 4.13 m, respectively, the ranging error stabilizes at 0.2%, and the minimum deflection of distance can reach $8~mathrm {mu m}$ .
激光频率调制的线性度是影响频率调制连续波(FMCW)激光雷达测距性能的关键因素。非线性会影响测距分辨率并带来误差。本文提出了一种基于激光调制信号波形预处理的频率调制非线性校正方法。经过校正后,使用重复频率为 50 kHz 的调制信号,激光器的残余非线性(1-r2)在上扫时降低到 1.85times 10^{-4}$,在下扫时降低到 8.47times 10^{-4}$。与校正前相比,光谱的最大值一半的全宽(FWHM)减小了 86%,因此在 38 厘米的距离上,测距误差为 0.37%。距离分别为 0.90 米、1.80 米、2.89 米和 4.13 米时,测距误差稳定在 0.2%,距离的最小偏差可达 $8~mathrm {mu m}$ 。
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引用次数: 0
Phase Shifts in Gain-Switched Semiconductor Laser Subharmonic Pulse Trains 增益开关半导体激光器次谐波脉冲序列中的相位偏移
IF 2.2 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-02 DOI: 10.1109/JQE.2024.3453281
Thomas B. Simpson;Joseph S. Suelzer;Nicholas G. Usechak
Gain switching of semiconductor lasers by strong sinusoidal current modulation can generate Period Two (P2) and Period Three (P3) sub-harmonic pulse trains. It is known that these pulse trains can be interrupted by bursting events, for the P2 pulse train predominantly consisting of short segments of relatively weak pulses at the modulation frequency (a P1-like state) before the system returns to the dominant P2 state. Similarly, for systems operating in the P3 state, intermittent switching yields combinations of P1- and P2-like pulses. To better understand these experimental observations, we perform numerical simulations using a standard model coupling the circulating optical field to the carriers of the gain medium and then compare the results with our experimental measurements on a single-mode distributed feedback laser. The simulations show that low optical power events typically precede the interruptions of the dominant sub-harmonic pulse trains. During these events, stochastic sources, such as spontaneous emission noise, which interact with the circulating optical field are found to dominate the deterministic changes to the calculated trajectory. With output in either P2 or P3 dominant pulse trains, we numerically and experimentally demonstrate that the induced phase fluctuations follow the statistics of classical telegraph noise for the P2 state, and a three-state variant for the P3 state.
通过强正弦电流调制对半导体激光器进行增益切换可产生周期二(P2)和周期三(P3)次谐波脉冲串。众所周知,这些脉冲序列会被突发事件打断,因为 P2 脉冲序列主要由调制频率相对较弱的短脉冲段组成(类似 P1 状态),然后系统才会返回主要的 P2 状态。同样,对于在 P3 状态下运行的系统,间歇切换会产生类似 P1 和 P2 的脉冲组合。为了更好地理解这些实验观察结果,我们使用将循环光场与增益介质载流子耦合的标准模型进行了数值模拟,然后将结果与我们在单模分布反馈激光器上的实验测量结果进行了比较。模拟结果表明,低光功率事件通常发生在主要次谐波脉冲序列中断之前。在这些事件中,与循环光场相互作用的随机源(如自发辐射噪声)会主导计算轨迹的确定性变化。在 P2 或 P3 主导脉冲序列输出时,我们通过数值和实验证明,P2 状态下的诱导相位波动遵循经典电报噪声统计,而 P3 状态下的诱导相位波动遵循三态变体统计。
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引用次数: 0
All-Optical General RS Flip-Flop and Clocked RS Flip-Flop Based on Cascaded PPLN Waveguides 基于级联 PPLN 波导的全光通用 RS 触发器和时钟 RS 触发器
IF 2.2 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-08-26 DOI: 10.1109/JQE.2024.3450371
Jing Shen;Yujuan Feng
By utilizing the principle of optical logic signal processing of periodically poled lithium niobate (PPLN) waveguide, this paper proposes schemes of all-optical general set-reset (RS) flip-flop and clocked RS flip-flop based on cascaded second-order nonlinearities of sum-frequency generation (SFG) and difference-frequency generation (DFG), and the principle is theoretically investigated. The waveforms, eye diagrams, extinction ratio (ER) and full width at half maximum (FWHM) of the light waves are calculated and simulated numerically. The results of static simulation demonstrate that the logic of general and clocked RS flip-flops are achieved well by these schemes; the timing sequential simulation demonstrate that the logic properties of flip-flops with a feedback loop can also be achieved well for timing sequential optical signals.
本文利用周期性极化铌酸锂(PPLN)波导的光逻辑信号处理原理,提出了基于和频发生(SFG)和差频发生(DFG)级联二阶非线性的全光通用置位复位(RS)触发器和时钟RS触发器方案,并对其原理进行了理论研究。对光波的波形、眼图、消光比(ER)和半最大全宽(FWHM)进行了数值计算和仿真。静态仿真结果表明,这些方案能很好地实现一般和时钟 RS 触发器的逻辑;时序仿真结果表明,带有反馈回路的触发器也能很好地实现时序光信号的逻辑特性。
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引用次数: 0
High-Performance Very Long Wave Infrared Quantum Cascade Detector Grown by MOCVD 利用 MOCVD 技术生长的高性能甚长波红外量子级联探测器
IF 2.2 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-08-22 DOI: 10.1109/JQE.2024.3448399
Kai Guo;Yixuan Zhu;Yu Chen;Kun Li;Shenqiang Zhai;Shuman Liu;Ning Zhuo;Jinchuan Zhang;Lijun Wang;Fengqi Liu;Xiaohua Wang;Zhipeng Wei;Junqi Liu
We present a very long wave infrared (VLWIR) quantum cascade detector (QCD) optimized for the extraction region grown by metal organic chemical vapor deposition (MOCVD). The wave function of high-energy states has been tailored into a funnel-shaped miniband structure. This design accelerates the extraction and collection of electrons, thereby enhancing the device’s extraction efficiency, with a theoretical calculation value of 91%. Besides, this miniband extraction scheme also increases the number of well barrier pairs between the ground state and the longitudinal optical (LO) phonon step level. The electron loss caused by thermal backfilling and thermally activated leakage can be effectively reduced. For a $200~mu $ m $times 200~mu $ m mesa device from a 4-inch wafer, a peak responsivity of 66 mA/W and a peak specific detectivity of $1.4 times 10^{11}$ Jones were obtained at 30 K, with the maximum operating temperature persists up to 170 K.
我们介绍了一种针对金属有机化学气相沉积(MOCVD)萃取区进行优化的甚长波红外量子级联探测器(QCD)。高能态的波函数被调整为漏斗状的迷你带结构。这种设计加速了电子的萃取和收集,从而提高了器件的萃取效率,理论计算值为 91%。此外,这种迷你带萃取方案还增加了基态与纵向光学(LO)声子阶跃电平之间的井势垒对数量。热回填和热激活泄漏引起的电子损耗可以有效减少。对于一个来自4英寸晶圆的200~mu $ m的200~mu $ m的mesa器件,在30 K时获得了66 mA/W的峰值响应率和1.4 times 10^{11}$ Jones的峰值比检测率,最高工作温度可持续到170 K。
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引用次数: 0
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IEEE Journal of Quantum Electronics
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