近日,华东师范大学的陈少强&陶加华及其研究小组与澳门大学的Guichuan Xing等人合作并取得一项新进展。经过不懈努力,他们通过声子辅助多步能量漏斗实现脉冲倍频钙钛矿纳米线激光器。相关研究成果已于2024年7月17日在国际知名学术期刊《光: 科学与应用》上发表。
该研究团队基于单飞秒激光脉冲激发,实现了自组装钙钛矿MQWs纳米线单模双脉冲纳米激光器,脉冲持续时间为28ps,脉冲间隔为22ps。在一定的时间尺度内,能量的持续积累对于增益介质中的多布居数反转是必不可少的,这是由于小n量子阱中更强的激子-声子耦合导致载流子局域化过程变慢造成的。因此,双脉冲激光是由相邻的小n量子波获得有源区域的快速能量漏斗过程和空间分离的量子波获得有源区域的慢能量漏斗过程实现的。这一研究结果对钙钛矿多脉冲激光器的内在能量弛豫机制有了新的认识,促进了钙钛矿多脉冲激光器的进一步发展。
据悉,光增益介质的激光脉冲倍增在集成光电器件小型化方面显示出巨大的潜力。钙钛矿多量子阱(MQWs)结构最近被认为是一种有效的增益介质,能够使激光脉冲加倍,而不依赖于外部光学器件。尽管基于钙钛矿MQWs薄膜实现了脉冲倍增的光放大,但微纳激光器具有特定的激光脉冲倍增腔,其相应的内在激光动力学仍然不足。
附:英文原文
Title: Pulse-doubling perovskite nanowire lasers enabled by phonon-assisted multistep energy funneling
Author: Zhao, Chunhu, Guo, Jia, Tao, Jiahua, Chu, Junhao, Chen, Shaoqiang, Xing, Guichuan
Issue&Volume: 2024-07-17
Abstract: Laser pulse multiplication from an optical gain medium has shown great potential in miniaturizing integrated optoelectronic devices. Perovskite multiple quantum wells (MQWs) structures have recently been recognized as an effective gain media capable of doubling laser pulses that do not rely on external optical equipment. Although the light amplifications enabled with pulse doubling are reported based on the perovskite MQWs thin films, the micro-nanolasers possessed a specific cavity for laser pulse multiplication and their corresponding intrinsic laser dynamics are still inadequate. Herein, a single-mode double-pulsed nanolaser from self-assembled perovskite MQWs nanowires is realized, exhibiting a pulse duration of 28ps and pulse interval of 22ps based on single femtosecond laser pulse excitation. It is established that the continuous energy building up within a certain timescale is essential for the multiple population inversion in the gain medium, which arises from the slowing carrier localization process owning to the stronger exciton–phonon coupling in the smaller-n QWs. Therefore, the double-pulsed lasing is achieved from one fast energy funnel process from the adjacent small-n QWs to gain active region and another slow process from the spatially separated ones. This report may shed new light on the intrinsic energy relaxation mechanism and boost the further development of perovskite multiple-pulse lasers.
DOI: 10.1038/s41377-024-01494-2
Source: https://www.nature.com/articles/s41377-024-01494-2
Light: Science & Applications:《光:科学与应用》,创刊于2012年。隶属于施普林格·自然出版集团,最新IF:19.4
官方网址:https://www.nature.com/lsa/
投稿链接:https://mts-lsa.nature.com/cgi-bin/main.plex