激光阈值
激光器
超短脉冲
激发态
随机激光器
材料科学
激发
增益开关
相(物质)
光电子学
光学
物理
原子物理学
量子力学
作者
Xinping Zhang,Jingyun Hu,Yulan Fu,Jinxin Guo,Yiwei Zhang,Xiaoyan Song
标识
DOI:10.1002/lpor.202200333
摘要
Abstract There are conventionally coherent and incoherent types of random lasers, which are characteristic of broadband and randomly distributed narrow‐band lasing spectrum, respectively. No fixed phase relationship has ever been observed between the lasing modes in such lasers. However, herein a new form of random lasers in patterned organic–inorganic hybrid perovskite MAPbBr 3 is discovered, where multiple simultaneously lasing modes are stably locked in phase so that lasing lines are achieved with equal spectral separations. This is the first observation of phase locking between random lasers, which is established by the cascaded molecular absorption‐emission or cascaded excitation‐injection processes between random laser modes. The fixed phase relationship is determined by the ultrafast relaxation of the excited molecules to the lower edge of the excitation band, correlating directly the absorption/excitation and emission/injection processes and producing a fixed phase shift. Thus, the bandwidth and separation of the lasing lines are dependent on the relaxation lifetime of the excited molecules and the number of cascading cycles. Such cascading dynamics has a timescale faster than 300 fs. These characteristics innovate the physics and explore new applications of both the MAPbBr 3 material and the random lasers. Such a strong phase‐locking mechanism suggests new mode‐locking schemes for ultrafast lasers.
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