波长快速扫描系统在算力网络、5G前传网络以及新一代可重构光分插复用系统等领域起着重要作用,整个波长扫描测试系统的性能基本取决于激光器性能的优劣。为此,基于In Ga As P/In P增益芯片优异的宽光谱光学特性和Littman-Metcalf外腔反...波长快速扫描系统在算力网络、5G前传网络以及新一代可重构光分插复用系统等领域起着重要作用,整个波长扫描测试系统的性能基本取决于激光器性能的优劣。为此,基于In Ga As P/In P增益芯片优异的宽光谱光学特性和Littman-Metcalf外腔反馈原理研制了一台具备宽调谐范围、高扫描速度以及无模式跳变等特点的可调谐激光器。实验上获得了240 nm/s的最高扫描速度、0.001 nm的最小步进触发间隔、优于±1.3 pm/1 min的波长稳定性、优于2.39 pm的绝对波长精度、优于±0.02 d B/1 min的功率稳定性及无跳模范围为110 nm的单纵模扫频输出。该研究有助于推动波长快速扫描测试系统的研究进程,提升波分复用等器件的测试精度和效率。展开更多
Magnetic topological semimetals have been at the forefront of condensed matter physics due to their ability to exhibit exotic transport phenomena.Investigating the interplay between magnetic and topological orders in ...Magnetic topological semimetals have been at the forefront of condensed matter physics due to their ability to exhibit exotic transport phenomena.Investigating the interplay between magnetic and topological orders in systems with broken time-reversal symmetry is crucial for realizing non-trivial quantum effects.We delve into the electronic structure of the rare-earth-based antiferromagnetic Dirac semimetal EuMg_(2)Bi_(2) using first-principles calculations and angle-resolved photoemission spectroscopy.Our calculations reveal that the spin-orbit coupling(SOC)in EuMg_(2)Bi_(2) prompts an insulator to topological semimetal transition,with the Dirac bands protected by crystal symmetries.The linearly dispersive states near the Fermi level,primarily originating from Bi 6p orbitals,are observed on both the(001)and(100)surfaces,confirming that EuMg_(2)Bi_(2) is a three-dimensional topological Dirac semimetal.This research offers pivotal insights into the interplay between magnetism,SOC and topological phase transitions in spintronics applications.展开更多
文摘波长快速扫描系统在算力网络、5G前传网络以及新一代可重构光分插复用系统等领域起着重要作用,整个波长扫描测试系统的性能基本取决于激光器性能的优劣。为此,基于In Ga As P/In P增益芯片优异的宽光谱光学特性和Littman-Metcalf外腔反馈原理研制了一台具备宽调谐范围、高扫描速度以及无模式跳变等特点的可调谐激光器。实验上获得了240 nm/s的最高扫描速度、0.001 nm的最小步进触发间隔、优于±1.3 pm/1 min的波长稳定性、优于2.39 pm的绝对波长精度、优于±0.02 d B/1 min的功率稳定性及无跳模范围为110 nm的单纵模扫频输出。该研究有助于推动波长快速扫描测试系统的研究进程,提升波分复用等器件的测试精度和效率。
基金supported by the National Key R&D Program of China(Grant No.2022YFA1604302)the National Natural Science Foundation of China(Grant Nos.U1632266,11927807,and U2032207)the approval of the Proposal Assessing Committee of SiP.ME^(2) platform project(Proposal No.11227902)supported by the National Science Foundation of China。
文摘Magnetic topological semimetals have been at the forefront of condensed matter physics due to their ability to exhibit exotic transport phenomena.Investigating the interplay between magnetic and topological orders in systems with broken time-reversal symmetry is crucial for realizing non-trivial quantum effects.We delve into the electronic structure of the rare-earth-based antiferromagnetic Dirac semimetal EuMg_(2)Bi_(2) using first-principles calculations and angle-resolved photoemission spectroscopy.Our calculations reveal that the spin-orbit coupling(SOC)in EuMg_(2)Bi_(2) prompts an insulator to topological semimetal transition,with the Dirac bands protected by crystal symmetries.The linearly dispersive states near the Fermi level,primarily originating from Bi 6p orbitals,are observed on both the(001)and(100)surfaces,confirming that EuMg_(2)Bi_(2) is a three-dimensional topological Dirac semimetal.This research offers pivotal insights into the interplay between magnetism,SOC and topological phase transitions in spintronics applications.
