Phase‐Locking of Random Lasers by Cascaded Ultrafast Molecular Excitation Dynamics

Author:

Zhang Xinping1ORCID,Hu Jingyun1,Fu Yulan1,Guo Jinxin1,Zhang Yiwei1,Song Xiaoyan2

Affiliation:

1. Institute of Information Photonics Technology Beijing University of Technology Beijing 100124 P. R. China

2. College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China Beijing University of Technology Beijing 100124 P. R. China

Abstract

AbstractThere 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 MAPbBr3 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 MAPbBr3 material and the random lasers. Such a strong phase‐locking mechanism suggests new mode‐locking schemes for ultrafast lasers.

Funder

Beijing Municipal Education Commission

National Natural Science Foundation of China

Publisher

Wiley

Subject

Condensed Matter Physics,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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