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| 1 | Global modes and coupled modes for integrated twin circular-side octagon microlasers显示文摘Whispering-gallery mode(WGM)microlasers are potential light sources for photonic integrated circuits and optical information processing.In this paper,an integrated twin circular-side octagon microlaser(TCOM)composed of two identical circular-side octagon microcavities(COMs)is proposed and demonstrated for realizing lasing mode control.In a TCOM,we found a global mode with the mode field of an'8'pattern(labeled'8'mode)in addition to weak coupling modes of traditional four-bounce modes.The'8'mode belongs to the whole coupled cavity and is insensitive to the refractive index offset of coupled COMs,but the weak coupling modes are strongly sensitive to the refractive index offset.Lasing mode transformation from multiple coupled modes to a single'8'mode is demonstrated by adjusting the refractive index offset through injection currents.Weak coupling modes for directly connected TCOMs and lasing mode control make the COM a potential unit for large-scale photonic integration and optical information processing. | Ke YANG Yuede YANG Youzeng HAO Jiliang WU Yongtao HUANG Jiachen LIU Jinlong XIAO Yongzhen HUANG | 2022 | Science China(Information Sciences)2022，65，2： | 0 |
| 2 | Programmable complex pumping field induced color-on-demand random lasing in fiber-integrated microbelts for speckle free imaging显示文摘Miniaturized lasers with on-demand color emission have immense potential in the development of integrated imaging sources. Random lasers(RLs) with cavity-free structures and low spatial coherence are promising candidates for multicolor imaging sources. However, the wide tuning range and high tuning accuracy of continuous and reversible random lasing color with a defined emissive direction remain challenging. Here, random lasing with on-demand color emission and defined emissive direction is realized in fiber-integrated microbelts through programmable pumping. Individual RL microbelts as RL units doped with blue(B)-, green(G)-, and red(R)-emissive dyes and titanium dioxide nanoparticles are assembled on an optical fiber, resulting in high-performance B/G/R lasing. The optical fiber functions as a waveguide that guides the multicolor RL to ensure a defined directional emission. By manipulating the combination of the B/G/R RL units on the waveguide, distinctive lasing colors covering the entire visible spectrum are obtained, including white-colored random lasing. To realize dynamically controllable lasing for on-demand color emission, a pumping strategy with programmable excitation is proposed by shaping the pump beams into different beam arrays for precisely pumping the RL unit combination. We envision that fiber-integrated RL sources can be implemented in various imaging applications, such as biomedical diagnosis, multiplexed communication, and optical sensing. | Xiaoyu SHI Kaiyue SHEN Yaoxing BIAN Wanting SONG Jun RUAN Zhaona WANG Tianrui ZHAI | 2023 | Science China(Information Sciences)2023，66，12： | 0 |
| 3 | 微纳激光器的光场调控及应用显示文摘微纳激光器是谐振腔尺寸为微/纳米量级的激光器,其模式体积在波长或亚波长尺度,具有小尺寸、易集成、低阈值、宽波段、可调谐等特点,在光芯片上光信息的产生、传输、耦合、调制、探测等功能的实现中占据核心位置,是微纳光学领域的重要前沿.微纳激光的光场特性与其应用研究息息相关,为了实现微纳激光光源的多功能化,研究人员从微纳激光光场调控的理论机制和实验测试、器件应用方面展开研究并取得了一系列进展.本文聚焦于这2方面,概述了微纳激光器的相关研究进展,着重阐述了通过泵浦、增益和谐振腔3条研究路径来调控激光性能的方法,总结微纳激光器在传感、防伪、成像与显示等领域的应用进展,并对其发展趋势进行了展望. | 翟天瑞 史晓玉 崔丽彬 仝俊华 刘宣 | 2023 | 北京师范大学学报(自然科学版)2023，59，6： | 0 |
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