Article
Optics
J. Bromage, S-W Bahk, M. Bedzyk, I. A. Begishev, S. Bucht, C. Dorrer, C. Feng, C. Jeon, C. Mileham, R. G. Roides, K. Shaughnessy, M. J. I. I. I. I. I. I. Shoup, M. Spilatro, B. Webb, D. Weiner, J. D. Zuegel
Summary: Optical parametric chirped-pulse amplification using multikilojoule Nd:glass pump lasers is a promising method for generating ultra-intense laser pulses. The MTW-OPAL Laser System is a mid-scale prototype aimed at producing 0.5-PW pulses with technologies scalable to tens of petawatts. Campaigns completed since March 2020 show that the laser design is fundamentally sound, with ongoing optimization for future first-focus campaigns.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Fuai Hu, Feifei Guo, Zheng Wang, Xutang Tao, Zeliang Gao
Summary: In this study, a BTM glass was investigated as an acousto-optic material for high-quality AOMs. The glass exhibited a large refractive index range and suitable sound velocity, making it a promising candidate for AOMs.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Lifu Cao, Baolei Tang, Xu Yu, Kaiqi Ye, Hongyu Zhang
Summary: By modifying crystallization conditions, orange and red emissive crystals with different mechanical properties were obtained. The red crystal, Cry-1R, demonstrated light transducing capability in both straight and bent states, suggesting its potential application as an active optical waveguiding medium.
Article
Engineering, Electrical & Electronic
Dongdong Zhang, Yafeng Bai, Yushan Zeng, Yingying Ding, Zhongpeng Li, Chuliang Zhou, Yuxin Leng, Liwei Song, Ye Tian, Ruxin Li
Summary: This study presents a feasible design path for high-repetition-rate, intense THz sources by combining wire-based THz sources with a wire-conveying tape design. Experimental results show that under 1 kHz laser excitation, the THz source can output an average power of 30 mW, making it the first high-repetition-rate and portable THz source generated by solid plasmas. The generated THz pulses have a center frequency of 0.3 THz and a bandwidth similar to 0.3 THz.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Kebede Atra, Giancarlo Cerulo, Jean-Guy Provost, Karim Mekhazni, Cosimo Calo, Frederic Pommereau, Carmen Gomez, Arnaud Wilk, Fabrice Blache, Catherine Fortin, Jean Decobert, Florence Martin, Estelle Derouin, Christophe Caillaud, Cedric Ware, Didier Erasme, Franck Mallecot, Mohand Achouche
Summary: This research provides a comprehensive characterization of reflective electroabsorption modulators (EAMs) integrated with semiconductor optical amplifiers (SOAs) for high-speed data transmission in the C-band. The results demonstrate that these devices can achieve high-quality transmission and perform well at 25 Gb/s in the C-band.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Vyacheslav S. Golovin, Sergey O. Slipchenko, Aleksandr A. Podoskin, Alena E. Kazakova, Nikita A. Pikhtin
Summary: This study investigates the basic principles of quantum well semiconductor laser design optimization and the current pumping requirements for generating optical pulses by gain switching. The experiment finds that there exist optimal values of optical confinement factor, resonator length, and current pulse amplitude for achieving maximum peak output power. Moreover, the study reveals that the optimal resonator length strongly depends on the target pulse width.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Song Ruogu, Li Xinyu, Wang Jinyu, Yue Wencheng, Yu Mingbin, Wang Shuxiao, Cai Yan
Summary: This article introduces the combination of broadband technologies and folded Michelson interferometer modulators to improve their high-frequency performance and device footprint. By using different additional electric structures and electrode distribution, higher bandwidth and better performance have been achieved.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Dusan Gostimirovic, Winnie N. Ye
Summary: The orientation and positioning of pn junctions play a crucial role in the performance of optoelectronic modulators, with vertical pn junctions showing promise in improving energy efficiency. New designs such as double vertical junctions offer increased interaction length and energy efficiency improvements. Comprehensive numerical comparisons demonstrate the potential of these new designs in enhancing power performance characteristics.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Marcin Franczyk, Dariusz Pysz, Ryszard Stepien, Jaroslaw Cimek, Rafal Kasztelanic, Fang Lin Chen, Mariusz Klimczak, Luming Zhao, Ivan Kasik, Pavel Peterka, Ryszard Buczynski
Summary: We present the experimental verification of a new type of active nanostructured fiber that can emit laser at two wavelengths simultaneously. The fiber core is made of nanorods doped with Yb3+ or co-doped with Yb3+/Er3+ ions, allowing control of relative gain and modal properties. The double-cladding fiber structure enables efficient excitation with a single pump laser, and a high-quality beam is generated. The laser operation was successfully demonstrated at output power levels of 0.78 W and 0.42 W at 1040 nm and 1534 nm, respectively.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Kuen Yao Lau, Alexander Pyymaki Perros, Diao Li, Maria Kim, Zhipei Sun
Summary: Graphene electro-optical modulators have emerged as a viable alternative to conventional modulators, offering broadband operation, ultrafast responsivity, small footprint, and low energy consumption. This study demonstrates the use of scalable graphene electro-optical modulators in all-fibre pulsed laser applications, showcasing its potential for high-performance 2 μm pulsed fibre lasers in various fields such as medical treatment, material processing, and spectroscopy.
Article
Engineering, Electrical & Electronic
Yuya Yamaguchi, Pham Tien Dat, Shingo Takano, Masayuki Motoya, Shotaro Hirata, Yu Kataoka, Junichiro Ichikawa, Ryo Shimizu, Naokatsu Yamamoto, Kouichi Akahane, Atsushi Kanno, Tetsuya Kawanishi
Summary: This article investigates two types of optical modulators, one is a long effective-length modulator for wavebands exceeding 100GHz, and the other is a broadband modulator integrated with an electro-optic frequency-domain equalizer that achieves over 110GHz 3dB bandwidth.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Optics
Weiwei Zhang, Martin Ebert, Ke Li, Bigeng Chen, Xingzhao Yan, Han Du, Mehdi Banakar, Dehn T. Tran, Callum G. Littlejohns, Adam Scofield, Guomin Yu, Roshanak Shafiiha, Aaron Zilkie, Graham Reed, David J. Thomson
Summary: Researchers have proposed a mechanism to enhance the extinction ratio of a low-quality-factor, high-speed ring modulator by harnessing the plasma absorption induced in a silicon metal-oxide-semiconductor waveguide, paving a way to the evolution of optical interconnects to 100 Gbaud and beyond per wavelength.
Article
Biochemistry & Molecular Biology
Adrian Scurtu, Dorina Ticos, Maria Luiza Mitu, Constantin Diplasu, Nicoleta Udrea, Catalin Mihai Ticos
Summary: The splitting of CO2 was studied in a pulsed plasma discharge produced in a coaxial gun. Spectroscopic measurements were carried out, and evidence of CO2 dissociation into oxygen and CO was found. The increased discharge current led to more intense spectra lines and the presence of new oxygen lines, indicating more dissociation channels. Possible applications include oxygen production in future Mars missions.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Engineering, Electrical & Electronic
Fan Zhang, Lei Zhang, Xiaoke Ruan, Fan Yang, Hao Ming, Yanping Li
Summary: In this study, we focus on the high baud rate operation of silicon photonic modulators for short-reach and metro-haul applications. The current status of devices and digital signal processing is discussed, with a simulation-based study on the design of a carrier-depletion-based dual-drive traveling-wave Mach-Zehnder modulator. Transmission experiments of high baud rate signals using all-silicon modulators show promising results for future optical communication systems operating at 100 Gbaud.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Alexander Mittelstaedt, Ludwig A. Th Greif, Stefan T. Jagsch, Andrei Schliwa
Summary: A novel linear combination of atomic orbitals-type of approximation is proposed for accurate electronic structure calculations in systems with 20 or more electronically coupled quantum dots. Edge effects determine electronic structure for stacks of fewer than 10 quantum dots, with a homogeneous confinement region developing in the center thereafter. The goal is to design a stack of vertically coupled quantum dots for a quantum-dot-based quantum cascade laser.
Article
Physics, Multidisciplinary
Pan-Fei Geng, Min Chen, Xiang-Yan An, Wei-Yuan Liu, Xin-Zhe Zhu, Jian-Long Li, Bo-Yuan Li, Zheng-Ming Sheng
Summary: By using a high-intensity flying focus laser, the dephasingless or phase-locked laser wakefield acceleration (LWFA) can be realized, which overcomes issues of laser diffraction, pump depletion, and electron dephasing. A self-consistently controlled electron injection in phase-locked LWFA is studied numerically, and it is found that a larger plasma density gradient is necessary compared with LWFA driven by lasers with fixed focus. The study provides a possible way for electron injection in LWFA driven by flying focus lasers.
Article
Optics
Xing-Long Zhu, Wei-Yuan Liu, Min Chen, Su-Ming Weng, Dong Wu, Zheng-Ming Sheng, Jie Zhang
Summary: An efficient mechanism has been discovered to generate gamma-rays with unprecedented brilliance using an ultrarelativistic electron beam incident onto a solid surface. This offers a promising route to achieve ultrabright gamma-ray sources for various applications.
Article
Physics, Nuclear
Xinzhe Zhu, Boyuan Li, Feng Liu, Jianlong Li, Zewu Bi, Xulei Ge, Hongyang Deng, Ziyang Zhang, Peilin Cui, Lin Lu, Wenchao Yan, Xiaohui Yuan, Liming Chen, Qiang Cao, Zhenyu Liu, Zhengming Sheng, Min Chen, Jie Zhang
Summary: A carefully designed experiment demonstrates the ability of centimeter-scale curved plasma channel to guide intense lasers and accelerate wakefields. Both experiments and simulations show that by gradually increasing the channel curvature radius and optimizing the laser incidence offset, the transverse oscillation of the laser beam can be mitigated, and the guided laser pulse excites wakefields, accelerating electrons to a maximum energy of 0.7 GeV. The results also indicate that such a channel has great potential for seamless multistage laser wakefield acceleration.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2023)
Article
Physics, Fluids & Plasmas
X. Y. Jiang, S. M. Weng, H. H. Ma, X. F. Li, C. F. Wu, Z. Liu, Y. Zhao, M. Chen, Z. M. Sheng
Summary: The electromagnetic emission generated by the conversion of electron plasma waves (EPWs) excited by stimulated Raman scattering (SRS) of an incident laser pulse in inhomogeneous plasma is investigated theoretically and numerically. It is found that mode conversion can occur naturally in underdense plasma region below the quarter critical density when EPWs are generated due to the development of backward SRS at a certain angle of incidence. The produced radiation can cover a wide frequency range and may provide a new source of tunable broadband radiation.
PHYSICS OF PLASMAS
(2023)
Article
Chemistry, Physical
Hongyang Deng, Ziyang Zhang, Min Chen, Jianlong Li, Qiang Cao, Xuejiao Hu
Summary: A multistage laser-wakefield accelerator with curved plasma channels is proposed for accelerating electrons to TeV energy levels. Plasma channels produced by discharging the capillary are used as waveguides to guide intense lasers and drive wakefields. This study presents the fabrication and performance details of a curved plasma channel with low surface roughness and high circularity, achieved through femtosecond laser ablation based on the response surface methodology. Experiments demonstrate successful laser guidance and achieved electron energy of 0.7 GeV.
Article
Physics, Applied
Wei -Yuan Liu, Xing-Long Zhu, Min Chen, Su-Ming Weng, Feng He, Zheng-Ming Sheng, Jie Zhang
Summary: Relativistic laser-wakefield acceleration is a promising candidate for next-generation compact accelerators due to its unparalleled accelerating gradient. However, accelerating positrons using this technique is challenging. This study proposes and numerically demonstrates a scheme to accelerate externally injected positrons in a nonlinear laser wakefield with the formation of a tail wave, which provides both focusing force and longitudinal acceleration for the positrons. The simulations show nearly 100% trapping efficiency of positrons in the nonlinear wakefield, offering a simple way for compact positron acceleration without the need for special laser modes and plasma structures using terawatt-class laser systems at high repetition rates.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Xing-Long Zhu, Wei-Yuan Liu, Min Chen, Su-Ming Weng, Dong Wu, Tong-Pu Yu, Wei-Min Wang, Zheng-Ming Sheng, Jie Zhang
Summary: In this study, a new approach to access the strong-field QED regime in the laboratory is presented, which involves self-pinching an electron beam to near-solid-density by passing it through a properly designed hollow cone target. This beam-focusing scheme can significantly reduce the beam diameter and increase its density, leading to the production of ultradense electron beams. These ultradense electron beams can unlock a new regime of QED-dominated beam-plasma interactions.
NEW JOURNAL OF PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Z. Liu, H. H. Ma, W. Wang, X. F. Li, P. P. Wang, C. Wang, S. H. Yew, S. M. Weng, Z. M. Sheng, J. Zhang
Summary: The development of parametric instabilities in the interaction of inhomogeneous plasma with laser pulses is investigated. The study shows that a laser with moderate fractional bandwidth can effectively suppress laser reflectivity but enhances two-plasmon decay and stimulated Raman scattering, leading to increased hot electron generation. However, increasing the laser bandwidth can ultimately reduce hot electron generation, depending on the laser intensity. The required laser bandwidth to mitigate instabilities and hot electron production depends strongly on laser intensity.
Article
Optics
Y. X. Wang, S. M. Weng, P. Li, Z. C. Shen, X. Y. Jiang, J. Huang, X. L. Zhu, H. H. Ma, X. B. Zhang, X. F. Li, Z. M. Sheng, J. Zhang
Summary: Plasma density gratings driven by intense laser pulses are widely studied for their ability to sustain ultra-high light intensity. This study demonstrates that when driven by two intersecting laser pulses, the plasma density grating becomes spatially and temporally nonuniform, causing depolarization of the probe laser pulse passing through it. Interestingly, laser depolarization can occur spontaneously when crossed laser beams are properly arranged. This finding holds potential for mitigating parametric instabilities in laser-driven inertial confinement fusion.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2023)
