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Power Scalability of 1.55-μm-Wavelength InP-Based Double-Lattice Photonic-Crystal Surface-Emitting Lasers With Stable Continuous-Wave Single-Mode Lasing 波长为 1.55μm 的基于 InP 的双晶格光子晶体表面发射激光器的功率可扩展性以及稳定的连续波单模激光器
IF 4.3 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-04 DOI: 10.1109/JSTQE.2024.3454202
Yuhki Itoh;Takeshi Aoki;Kosuke Fujii;Hiroyuki Yoshinaga;Naoki Fujiwara;Makoto Ogasawara;Yusuke Sawada;Rei Tanaka;Kenichi Machinaga;Hideki Yagi;Masaki Yanagisawa;Masahiro Yoshida;Takuya Inoue;Menaka De Zoysa;Kenji Ishizaki;Susumu Noda
This paper reports on the power scalability of 1.55-μm-wavelength photonic crystal surface emitting lasers (PCSELs) utilizing the design flexibility of the double-lattice photonic crystal. By controlling in-plane optical coupling, we have achieved single-mode continuous-wave lasing with various device sizes ranging from 100 μm to 300 μm in diameter. The output power exceeds 500 mW for a device size of 300 μm, and wall-plug efficiencies of all fabricated devices exceed 18%. Highly stable single-mode lasing with a side-mode suppression ratio over 60 dB is obtained even at the maximum output powers. Narrow circular beams are obtained, and the divergence angles decrease with increasing device size, ranging from 0.55 degrees to 0.23 degrees in FWHM for device sizes from 100 μm and 300 μm, respectively.
本文报告了利用双晶格光子晶体的设计灵活性,1.55 微米波长光子晶体表面发射激光器(PCSEL)的功率可扩展性。通过控制面内光耦合,我们实现了直径从 100 μm 到 300 μm 的各种器件尺寸的单模连续波激光。当器件尺寸为 300 μm 时,输出功率超过 500 mW,所有器件的壁插效率均超过 18%。即使在最大输出功率下,也能获得高度稳定的单模激光,侧模抑制比超过 60 dB。器件尺寸从 100 μm 到 300 μm 时,发散角分别从 0.55 度到 0.23 度(FWHM)不等。
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引用次数: 0
Wavelength-Stabilized Multi-Active Region DBR and DFB Broad-Area and Ridge-Waveguide Lasers for High Peak-Power Pulsed Operation 用于高峰值功率脉冲操作的波长稳定多能区 DBR 和 DFB 广域和脊波导激光器
IF 4.3 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-03 DOI: 10.1109/JSTQE.2024.3454353
Heike Christopher;Nor Ammouri;Maximilian Beier;Jörg Fricke;Arnim Ginolas;Jan-Philipp Koester;Armin Liero;Andre Maaßdorf;Sonja Nozinic;Hans Wenzel;Andrea Knigge
For LiDAR applications, compact, robust, and mass-producible light sources generating high-peak power nanosecond-long pulses are essential. This paper presents an investigation of power scaling in semiconductor lasers via the number of epitaxially stacked active regions in a single vertical waveguide supporting a higher order mode, chip length, output aperture width, and lateral waveguide design. All devices are wavelength-stabilized using surface gratings integrated either as a passive section at the rear facet of the diode laser as a distributed-Bragg-reflector (DBR) or along the full length of the chip in a distributed feedback (DFB) design. A 4 mm long broad-area (BA) DBR laser with a stripe width of 200 μm and five active regions delivered approximately 171 W at 80 A, a factor of 6.6 more peak pulse power than the standard 6 mm long single active region DBR laser with 50 μm stripe width. A corresponding 3 mm long 3-active region DFB-BA laser achieved more than 125 W at 129 A. These BA lasers have a lateral beam propagation ratio M$^{2}approx$ 30. In contrast, weakly tapered ridge waveguide (TRW) lasers were found to generate more than 20 W with an M$^{2}$ of about 3 and an excellent lateral brightness of 24 W$cdot$ mm$^{-1}$mrad$^{-1}$.
对于激光雷达应用而言,产生纳秒长脉冲的高峰值功率光源必须结构紧凑、坚固耐用且可大规模生产。本文通过单个垂直波导中支持高阶模式的外延堆叠有源区数量、芯片长度、输出孔径宽度和横向波导设计,对半导体激光器的功率缩放进行了研究。所有器件都使用表面光栅进行波长稳定,这些光栅有的是作为无源部分集成在二极管激光器的后端面,即分布式布拉格反射器(DBR),有的是沿着芯片全长进行分布式反馈(DFB)设计。4 毫米长的宽面积 (BA) DBR 激光器的条纹宽度为 200 μm,有五个有源区,在 80 A 电流下可输出约 171 W 的功率,比标准的 6 毫米长、条纹宽度为 50 μm 的单有源区 DBR 激光器的峰值脉冲功率高出 6.6 倍。这些 BA 激光器的横向光束传播比 M$^{2}/approx$ 30。相比之下,弱锥形脊波导(TRW)激光器的功率超过了 20 W,M$^{2}$ 约为 3,横向亮度为 24 W$cdot$mm$^{-1}$mrad$^{-1}$。
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引用次数: 0
Theoretical Analysis of Threshold Characteristics in Electrically-Driven GeSn Lasers 电驱动 GeSn 激光器阈值特性的理论分析
IF 4.3 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-03 DOI: 10.1109/JSTQE.2024.3453252
Soumava Ghosh;Guo-En Chang
GeSn lasers have emerged as a promising solution for on-chip lasers in silicon photonics. This study systematically investigated the threshold characteristics of electrically-driven Ge1–xSnx lasers on Si operating at room temperature, focusing on Sn content and defect density. Theoretical models were developed to calculate band structure, carrier occupation, free-carrier absorption (FCA), and threshold current density. The results indicate that at low Sn contents, where the GeSn active layer is an indirect bandgap material, increasing Sn content decreases the energy difference (ΔEΓL) between indirect and direct conduction band edges, thereby reducing transparent carrier density. Conversely, when the GeSn active layer is transformed into a direct bandgap material with a sufficiently high Sn content, the transparent hole density is minimally affected by further Sn increases. Additionally, increasing defect densities increases FCA, suppressing net gain, highlighting the need for high material quality in Ge1–xSnx with defect densities below 107cm2 for efficient lasing. Moreover, while increasing Sn content initially reduces threshold current density, further increments lead to higher Auger recombination current at longer lasing wavelengths, limiting continuous decrease. Therefore, an optimal Sn content of 13% achieves the lowest threshold current density. This study provides valuable guidelines for developing efficient electrically-driven Ge1–xSnx lasers for practical room-temperature applications.
GeSn 激光器已成为硅光子学中一种很有前途的片上激光器解决方案。本研究系统地研究了在室温下工作的硅上电驱动 Ge1-xSnx 激光器的阈值特性,重点是锡含量和缺陷密度。研究建立了理论模型来计算带状结构、载流子占据、自由载流子吸收(FCA)和阈值电流密度。结果表明,在锡含量较低时,GeSn 活性层是一种间接带隙材料,锡含量的增加会减小间接和直接导带边缘之间的能差(ΔEΓL),从而降低透明载流子密度。相反,当 GeSn 活性层转变为锡含量足够高的直接带隙材料时,进一步增加锡含量对透明空穴密度的影响微乎其微。此外,增加缺陷密度会增加 FCA,从而抑制净增益,这突出表明,要实现高效率的激光,就必须在缺陷密度低于 1×107cm-2 的 Ge1-xSnx 中采用高质量的材料。此外,虽然增加锡含量最初会降低阈值电流密度,但进一步增加会导致在较长的激光波长下产生更高的奥杰尔重组电流,从而限制了持续降低。因此,13% 的最佳锡含量可实现最低的阈值电流密度。这项研究为开发用于实际室温应用的高效电驱动 Ge1-xSnx 激光器提供了宝贵的指导。
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引用次数: 0
Polarization-Stabilized 1130 nm VCSEL Arrays: Performance and Scalability 偏振稳定的 1130 nm VCSEL 阵列:性能和可扩展性
IF 4.3 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-09-03 DOI: 10.1109/JSTQE.2024.3453489
Andrea Ott;Daniela Stange;Johanna Kolb;Alexander van der Lee;Tobias Pusch;Negar Gheshlaghi;Benjamin Gronau;Stephan Gronenborn;Roman Körner
This paper presents an in-depth evaluation of 1130 nm VCSEL devices, including single emitters and arrays produced using industrial III-V semiconductor fabrication processes. The study focuses on electro-optical performance and device longevity, revealing wall plug efficiencies of approximately 32% at 25 °C for single junction devices. A detailed comparison between polarization-stabilized and non-stabilized devices highlights that polarization-stabilized VCSELs maintain a consistent polarization extinction ratio of around −15 dB, regardless of their modal behavior. Additionally, we introduce a model predicting the scaling of arrays to achieve watt-level power outputs, optimizing optical aperture, pitch, and mesa count for specific applications. This analysis underlines the potential of these devices for advanced sensing and data transmission applications.
本文深入评估了 1130 nm VCSEL 器件,包括使用工业 III-V 半导体制造工艺生产的单发射器和阵列。研究的重点是电光性能和器件寿命,结果显示单结器件在 25 °C 时的壁塞效率约为 32%。通过对偏振稳定和非稳定器件进行详细比较,我们发现偏振稳定的 VCSEL 无论其模态行为如何,都能保持稳定的偏振消光比(约 -15 dB)。此外,我们还引入了一个模型,预测阵列的扩展,以实现瓦级功率输出,并针对特定应用优化光学孔径、间距和网格数。这项分析强调了这些器件在先进传感和数据传输应用方面的潜力。
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引用次数: 0
Influence of Band-Edge Frequency Non-Uniformity in Ultra-Large-Area Photonic-Crystal Surface-Emitting Lasers 超大面积光子晶体表面发射激光器带边频率不均匀性的影响
IF 4.3 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-08-30 DOI: 10.1109/JSTQE.2024.3452126
Takuya Inoue;Kentaro Maeda;Masahiro Yoshida;John Gelleta;Shumpei Katsuno;Kenji Ishizaki;Menaka De Zoysa;Susumu Noda
Photonic-crystal surface-emitting lasers (PCSELs), which are based on a two-dimensional (2D) optical resonance at a band edge of a photonic band structure, feature ultra-large-area single-mode lasing oscillation with scalable output power. In this paper, we theoretically investigate the influence of the band-edge frequency non-uniformity in ultra-large-area PCSELs, which can be caused by carrier-induced or temperature-induced refractive-index change during operation. First, we perform a perturbation analysis to derive an analytical condition to maintain single-mode lasing in the presence of the band-edge frequency non-uniformity, and reveal that it is important to increase not only the threshold gain difference but also the frequency difference between the fundamental mode and higher-order modes. Next, we perform numerical simulations on lasing characteristics of 3-mm-diameter PCSELs with non-uniform band-edge frequency distributions, and investigate the robust design against gradually changed frequency distributions or random frequency fluctuations.
光子晶体表面发射激光器(PCSEL)基于光子带结构带边的二维(2D)光学共振,具有输出功率可扩展的超大面积单模激光振荡特性。在本文中,我们从理论上研究了超大面积 PCSEL 中带边频率不均匀性的影响,这种不均匀性可能是由工作过程中载流子或温度引起的折射率变化造成的。首先,我们进行了扰动分析,得出了在带边频率不均匀的情况下保持单模激光的分析条件,并揭示出不仅要增大阈值增益差,还要增大基模与高阶模之间的频率差。接下来,我们对带边频率分布不均匀的 3 毫米直径 PCSEL 的激光特性进行了数值模拟,并研究了针对逐渐变化的频率分布或随机频率波动的稳健设计。
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引用次数: 0
Use of a Simple Passive Hardware Mask to Replace the Digital Masking Procedure in Photonic Delay-Based Reservoir Computing 在基于光子延迟的存储库计算中使用简单的无源硬件掩模取代数字掩模程序
IF 4.9 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-08-28 DOI: 10.1109/jstqe.2024.3451113
Ian Bauwens, Peter Bienstman, Guy Verschaffelt, Guy Van der Sande
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引用次数: 0
Coherent Optical-to-Microwave Link Using an Integrated Microcomb 使用集成微蜂窝的相干光到微波链路
IF 4.3 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-08-28 DOI: 10.1109/JSTQE.2024.3451301
Qing-Xin Ji;Wei Zhang;Lue Wu;Warren Jin;Joel Guo;Avi Feshali;Mario Paniccia;John Bowers;Andrey Matsko;Kerry Vahala
Microcombs are advancing optical frequency comb technology towards a chip-integrable form. Here, we characterize a microwave signal source based upon the two-point optical frequency division (2P-OFD) technique. The system uses a frequency microcomb to transfer relative frequency stability of two low-noise optical oscillators to the microcomb repetition rate tone. The two optical oscillators are based on semiconductor lasers jointly stabilized to an ultra-stable Fabry–Pérot cavity. The coherence of the comb spectrum is confirmed through multiple stability comparisons between its repetition rate and comb line spectrum. The results underscore the excellent performance of microcombs as coherent links between optical and microwave frequencies, and how they enable simplified, miniaturized architectures for optical frequency division.
微梳技术正在推动光频梳技术向芯片集成形式发展。在此,我们介绍了一种基于两点光分频(2P-OFD)技术的微波信号源。该系统使用频率微蜂窝将两个低噪声光振荡器的相对频率稳定性传递给微蜂窝重复率音调。这两个光振荡器基于半导体激光器,共同稳定在一个超稳定的法布里-佩罗腔上。通过对其重复率和梳状线频谱进行多次稳定性比较,确认了梳状频谱的一致性。研究结果强调了微梳作为光学和微波频率之间的相干链路所具有的卓越性能,以及微梳如何实现光学频率划分的简化、小型化架构。
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引用次数: 0
Output Power of III-V Injection Microdisk and Microring Lasers III-V 注塑微盘和微oring 激光器的输出功率
IF 4.3 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-08-27 DOI: 10.1109/JSTQE.2024.3450812
Natalia V. Kryzhanovskaya;Eduard I. Moiseev;Alexey M. Nadtochiy;Ivan A. Melnichenko;Nikita A. Fominykh;Konstantin A. Ivanov;Sergey D. Komarov;Ivan S. Makhov;Evgenii V. Lutsenko;Aliaksei G. Vainilovich;Aliaksei V. Nahorny;Alexey E. Zhukov
Technological progress makes it possible to significantly reduce the size of semiconductor laser emitters to microscales and sizes commensurate with the emission wavelength. Extreme laser miniaturization can be achieved using disk or ring resonators supporting high-Q whispering gallery modes (WGM). WGM lasers are interesting not only due to small sizes (small mode volume) but also for their long times of light-matter interaction, unique capabilities of sensing and studying of quantum chaos and so on. On the other hand, small losses for the output of emission in high-Q resonators can negate the practical benefits of the laser or even completely hide the peculiarities of the light physics inside the cavity. In this review, we attempted to summarize the published data on the achieved optical output power in different III-V injection microlasers and analyzed the key characteristics that limit the maximum output power, especially influence of the active region self-heating at cw operation and impeded light extraction out of WGM cavities. We compared various III-V materials and fabrication methods developed for improving emission output. We also observe very low relative intensity noise in microdisk lasers and harmonics of the resonance frequency in the relative intensity noise spectrum.
技术的进步使半导体激光发射器的尺寸大幅缩小到与发射波长相称的微米级成为可能。利用支持高 Q 值耳语画廊模式(WGM)的盘式或环形谐振器,可以实现激光器的极度微型化。WGM 激光器不仅体积小(模式体积小),而且光与物质的相互作用时间长,具有感知和研究量子混沌的独特能力,因此非常有趣。另一方面,高 Q 值谐振器中发射输出的微小损耗可能会抵消激光器的实际优势,甚至完全掩盖腔内光物理学的特殊性。在这篇综述中,我们试图总结已发表的有关不同 III-V 注入式微激光器达到的光输出功率的数据,并分析限制最大输出功率的关键特性,特别是 cw 工作时有源区自加热的影响和 WGM 腔内光提取的阻碍。我们比较了为提高输出功率而开发的各种 III-V 材料和制造方法。我们还在微盘激光器中观察到了极低的相对强度噪声,以及相对强度噪声频谱中谐振频率的谐波。
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引用次数: 0
Transfer-Printed Multiple GeSn Membrane Mid-Infrared Photodetectors 转移印迹多层 GeSn 膜中红外光探测器
IF 4.3 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-08-26 DOI: 10.1109/JSTQE.2024.3450302
Cédric Lemieux-Leduc;Mahmoud R. M. Atalla;Simone Assali;Sebastian Koelling;Patrick Daoust;Lu Luo;Gérard Daligou;Julien Brodeur;Stéphane Kéna-Cohen;Yves-Alain Peter;Oussama Moutanabbir
Due to their narrow band gap and compatibility with silicon processing, germanium-tin (Ge$_{1-x}$Sn$_{x}$) alloys are a versatile platform for scalable integrated mid-infrared photonics. These semiconductors are typically grown on silicon wafers using Ge as an interlayer. However, the large lattice mismatch in this heteroepitaxy protocol leads to the build-up of compressive strain in the grown layers. This compressive strain limits the material quality and its thermal stability besides expanding the band gap, thereby increasing the Sn content needed to cover a broader range in the mid-infrared. Released Ge$_{1-x}$Sn$_{x}$ membranes provide an effective way to mitigate these harmful effects of the epitaxial strain and control the band gap energy while enabling the hybrid integration onto different substrates. Nevertheless, the epitaxial strain is also known to affect the fabrication of membrane devices due to a significant bowing upon release from the growth substrate, especially in high Sn content structures. With this perspective, herein these limitations are discussed and addressed by introducing bow-free, strain-relaxed Ge$_{1-x}$Sn$_{x}$ membranes in the fabrication of mid-infrared devices. These devices are transfer-printed with metal contacts to create multiple photodetectors in a single transfer step. The resulting photodetectors exhibit an extended photodetection cutoff reaching a wavelength of $3.1 ,mu$m for a Sn content of ${x=0.11}$ compared to as-grown photoconductive devices. The latter yields a reduced cutoff of $2.8 ,mu$m due to the inherent compressive strain. Additionally, a significant reduction in the dark current of two orders of magnitude is observed, which could be related to the formation of a Schottky barrier or to a change in the contact resistivity during the processing steps of the membranes. Furthermore, the impact of chemical treatment and annealing on the device performance was also investigated showing a further reduction in the dark current. The demonstrated transfer printing, along with the use of an adhesive layer, allows the transfer of multiple GeSn membranes onto virtually any substrate. This approach paves the way for scalable fabrication of hybrid optoelectronic devices leveraging the tunable band gap of Ge$_{1-x}$Sn$_{x}$ in the mid-infrared range.
锗锡合金(Ge$_{1-x}$Sn$_{x}$)具有窄带隙和与硅加工兼容的特点,是可扩展的集成中红外光学的多功能平台。这些半导体通常使用 Ge 作为中间层在硅晶片上生长。然而,这种异质外延协议中的巨大晶格失配会导致生长层中压应变的积累。这种压应变除了扩大带隙外,还限制了材料的质量及其热稳定性,从而增加了覆盖更宽中红外范围所需的锡含量。释放出的 Ge$_{1-x}$Sn$_{x}$ 膜为减轻外延应变的有害影响和控制带隙能提供了一种有效的方法,同时还能在不同的基底上实现混合集成。然而,众所周知,外延应变也会影响膜器件的制造,因为从生长基底释放时会产生明显的弯曲,特别是在高 Sn 含量结构中。从这个角度出发,本文通过在中红外器件的制造中引入无弓形、应变松弛的 Ge$_{1-x}$Sn$_{x}$ 膜来讨论和解决这些限制。这些器件采用金属触点转移印制,只需一个转移步骤就能制造出多个光电探测器。与原样生长的光电导器件相比,在锡含量为${x=0.11}$时,所产生的光电探测器显示出更长的光电探测截止波长,达到3.1 ,mu$m。由于固有的压缩应变,后者的截止波长降低到了 2.8 mu$m。此外,还观察到暗电流显著降低了两个数量级,这可能与肖特基势垒的形成有关,也可能与薄膜加工步骤中接触电阻率的变化有关。此外,还研究了化学处理和退火对器件性能的影响,结果显示暗电流进一步降低。所展示的转移印刷以及粘合剂层的使用,几乎可以将多个 GeSn 膜转移到任何基底上。这种方法为利用 Ge$_{1-x}$Sn$_{x}$ 在中红外范围内的可调带隙可扩展地制造混合光电器件铺平了道路。
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引用次数: 0
Review of Selected Quantum Measurements Applied to Embedded Quantum Well in Nanoscale Transistor 应用于纳米级晶体管中嵌入式量子阱的精选量子测量综述
IF 4.3 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-08-21 DOI: 10.1109/JSTQE.2024.3447163
Jeremy Belhassen;Avraham Chelly
The fabrication of nanoelectronic and nanophotonic devices based on embedded quantum structures has become feasible over the last decades, and the field is continuously improving. Quantum measurements describing evolving configurations are required as part of the optical characterization and performances study of these devices. To ensure accuracy, it is necessary to determine a reliable evaluation of the expected quantum effects relevant to both stationary and time-dependent measurements. Based on a case study of a quantum well embedded in a nanoelectronic MOSFET device as the gate-recessed channel (GRC), a set of possible quantum measurements that can serve as a basis to similar applications of the rules on additional devices is presented and analyzed.
过去几十年来,基于嵌入式量子结构的纳米电子和纳米光子器件的制造已变得可行,并且该领域正在不断改进。作为这些器件的光学表征和性能研究的一部分,需要对不断变化的配置进行量子测量。为确保准确性,有必要对与静态和随时间变化的测量相关的预期量子效应进行可靠评估。本文以纳米电子 MOSFET 器件中嵌入量子阱作为栅极后置沟道 (GRC) 的案例研究为基础,介绍并分析了一组可能的量子测量方法,这些测量方法可作为类似规则在其他器件上应用的基础。
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引用次数: 0
期刊
IEEE Journal of Selected Topics in Quantum Electronics
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