Article
Optics
Yuanlong Fan, K. Alan Shore, Xiaopeng Shao
Summary: This paper presents the first theoretical treatment of the dynamics of electrically pumped nano-laser arrays, focusing on two specific forms: a three-element linear array and triangular arrays. The Purcell effect and the optical coupling in nano-lasers result in novel dynamical behaviors. Two-dimensional portraits offer a convenient means to determine the dynamics accessible by varying the laser drive current.
Article
Engineering, Electrical & Electronic
Mike Adams, Rihab Al Seyab, Ian Henning, Hadi Susanto, Martin Vaughan
Summary: Studying the simplified rate equation models for coupled laser pairs can provide approximate solutions and explicit expressions for the boundaries of stable dynamics. This is important for understanding the dynamics of two-element VCSEL arrays and the effects of material, device, and operating conditions.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Zhenxing Sun, Rulei Xiao, Zhirui Su, Kui Liu, Gen Lv, Ke Xu, Tao Fang, Yuechun Shi, Yi-Jen Chiu, Xiangfei Chen
Summary: In this research, a four-channel wavelength-tunable in-series DFB laser array with linearly chirped Bragg gratings and reflector sections is proposed and experimentally demonstrated. The design reduces extra power loss and enables low threshold current operation, while maintaining stable single-mode operation with high output power and uniform channel spacing.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Nusrat Jahan, William North, Pawel Strzebonski, Kent D. Choquette
Summary: This study reports and analyzes the supermode switching with current injection in coherently-coupled dual-element vertical cavity surface emitting laser arrays. The enhanced output power from in-phase or out-of-phase supermodes is confirmed when equal currents are injected into each array element. The switching of coherent supermodes from out-of-phase to in-phase is consistent with coupled mode theory and a 1-dimensional spatial supermode model, with calculated modal gain matching the observed switching behavior.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Sergey O. Slipchenko, Aleksandr A. Podoskin, Vyacheslav S. Golovin, Marina G. Rastegaeva, Natalia V. Voronkova, Nikita A. Pikhtin, Timur A. Bagaev, Maxim A. Ladugin, Aleksandr A. Marmalyuk, Vladimir A. Simakov
Summary: The addition of a highly-doped layer to a low-voltage thyristor p-base increases the pulse repetition rate, allowing for high-frequency laser pulse output using the META chip. However, increasing the frequency results in minor heating and a slight decrease in peak power.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Multidisciplinary Sciences
Kyungduk Kim, Stefan Bittner, Yongquan Zeng, Stefano Guazzotti, Ortwin Hess, Qi Jie Wang, Hui Cao
Summary: This study introduces a method for ultrafast generation of random bit streams using a single laser diode, achieving a total bit rate of 250 terabits per second with off-line postprocessing. The approach is robust, compact, energy-efficient, and has potential applications in secure communication and high-performance computation.
Article
Multidisciplinary Sciences
Archie F. A. Bott, Petros Tzeferacos, Laura Chen, Charlotte A. J. Palmer, Alexandra Rigby, Anthony R. Bell, Robert Bingham, Andrew Birkel, Carlo Graziani, Dustin H. Froula, Joseph Katz, Michel Koenig, Matthew W. Kunz, Chikang Li, Jena Meinecke, Francesco Miniati, Richard Petrasso, Hye-Sook Park, Bruce A. Remington, Brian Reville, J. Steven Ross, Dongsu Ryu, Dmitri Ryutov, Fredrick H. Seguin, Thomas G. White, Alexander A. Schekochihin, Donald Q. Lamb, Gianluca Gregori
Summary: Understanding magnetic field generation and amplification in turbulent plasma is crucial for explaining observations of magnetic fields in the universe. This study validates a theoretical framework for the origin and sustainment of these fields, and reports an experiment on laboratory plasma dynamo with Pm & 1. By characterizing plasma evolution and measuring various properties, it is shown that plasma turbulence from strong shear can generate fields more efficiently than previously thought, potentially explaining large-scale fields in astrophysical systems.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Physics, Multidisciplinary
Peng Jia, Zhi-Jun Zhang, Yong-Yi Chen, Zai-Jin Li, Li Qin, Lei Liang, Yu-Xin Lei, Cheng Qiu, Yue Song, Xiao-Nan Shan, Yong-Qiang Ning, Yi Qu, Li-Jun Wang
Summary: This paper presents a semiconductor laser array with single-mode emission. The lateral mode is selected by fabricating 6 μm-wide ridge waveguides, which enables the fundamental mode of the laser array. The maximum output power of single-mode emission reaches 36 W at an injection current of 43 A, followed by a kink. The slow axis far-field divergence angle of the unit is 13.65 degrees. The beam quality factor M (2) of the units, determined by the second-order moment method, is 1.2. This single-mode emission laser array can be used for laser processing.
Article
Nanoscience & Nanotechnology
Natsuko Ishida, Yasutomo Ota, Wenbo Lin, Tim Byrnes, Yasuhiko Arakawa, Satoshi Iwamoto
Summary: In this paper, a theoretical analysis of a large-scale single-mode laser based on a topological edge state is presented. The results demonstrate that stronger couplings between the cavities and lower losses are advantageous for achieving stable operation of the device. The laser also shows robustness under non-ideal situations.
Article
Management
Qihe Tang, Zhiwei Tong, Yang Yang
Summary: In a turbulent market, the credit quality process of defaultable obligors in a large credit portfolio is described by stochastic differential equations with drift and volatility terms. Market beta is used to measure systematic risk loading. The portfolio loss is driven by systematic risk, amplified by market beta.
EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
(2021)
Article
Optics
Francesc Bravo-Montero, David Castells-Rufas, Jordi Carrabina
Summary: This paper presents a system using a matrix of laser beams controlled by high-performance computing platform to overcome the speed bottleneck in laser marking. Industrial solutions presented in this paper can achieve higher speed and resolution for image printing on printing substrates. Further increase in speed is possible by investing in additional laser beams.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Alex Dikopoltsev, Tristan H. Harder, Eran Lustig, Oleg A. Egorov, Johannes Beierlein, Adriana Wolf, Yaakov Lumer, Monika Emmerling, Christian Schneider, Sven Hoefling, Mordechai Segev, Sebastian Klembt
Summary: Topological insulator lasers are semiconductor laser arrays that utilize topology to create a single coherent laser from multiple emitters. The vertical-cavity surface-emitting laser (VCSEL) array demonstrated in this study emits at a single frequency and displays interference, showcasing the mutual coherence of the emitters. This experiment highlights the power of topological transport of light, where even with most of the light oscillating vertically, the small in-plane coupling forces individual emitters to behave as a single laser.
Article
Engineering, Electrical & Electronic
Vladislav A. Oleshchenko, Alexander Uskov, Victor V. Bezotosnyi
Summary: A new approach for cooling Laser Diode Arrays (LDAs) is proposed in this study, where a coolant is used to remove heat directly from the Laser Diode Bars (LDBs) in the LDA. Simulation results demonstrate that this cooling method can achieve an output optical power density of about 20 kW/cm(2) in continuous wave operation mode, and maintaining a turbulent flow of the coolant can improve the cooling efficiency and output characteristics of the device.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2022)
Article
Chemistry, Analytical
Kiran Saba, Anna Kafar, Jacek Kacperski, Krzysztof Gibasiewicz, Dario Schiavon, Takao Oto, Szymon Grzanka, Piotr Perlin
Summary: In this study, a solution is proposed for realizing a surface emitting, 2D array of visible light laser diodes based on AlInGaN semiconductors. The system consists of a horizontal cavity lasing section and a beam deflecting section in the form of 45 degrees inclined planes. These sections are placed near etched vertical cavity mirrors, fabricated by Reactive Ion Beam Etching. The experimental results confirm the operation principle of the device, but unexpected angular distribution of reflected rays for angles lower than 45 degrees is observed, which is attributed to light diffraction and interference between the vertical and deflecting mirrors. The proposed solution combines the maturity of edge-emitting laser technology with the versatility of surface-emitting lasers, including on-wafer testing of emitters and addressability of single light sources.
Article
Multidisciplinary Sciences
G. Rigon, B. Albertazzi, T. Pikuz, P. Mabey, V Bouffetier, N. Ozaki, T. Vinci, F. Barbato, E. Falize, Y. Inubushi, N. Kamimura, K. Katagiri, S. Makarov, M. J-E Manuel, K. Miyanishi, S. Pikuz, O. Poujade, K. Sueda, T. Togashi, Y. Umeda, M. Yabashi, T. Yabuuchi, G. Gregori, R. Kodama, A. Casner, M. Koenig
Summary: This study successfully measured the turbulent spectrum in a laser-plasma experiment at the micron scale, providing a platform for the direct comparison of experimental results, theory, and numerical simulations.
NATURE COMMUNICATIONS
(2021)