Abstract

Abstract Hybrid lead halide perovskites have made great strides in next-generation photovoltaic and optoelectronic devices. Random lasers based on perovskite materials have been intensively investigated, but the miniaturization of perovskite random lasers has not been achieved up to now. Here, we report the fabrication of perovskite random lasers based on perovskite films deposited on the optical fiber facets using a dip-coating method. Under optical pumping conditions, random lasing was observed with minimum threshold energy of 32.3 μJ/cm2 at ~550 nm; also, the lasing threshold decreased with increasing diameter of the optical fiber. The results show that the random lasing emission originates from the scattering between the perovskite crystal grains, and the decreased threshold is attributed to the increased active area of the perovskite film. The directionality of perovskite random lasers indicates that the divergence angle of the laser beam is less than 60°. We also demonstrate that the perovskite random laser on the fiber facet can prevent speckle formation and improve image quality. These results may promote the applications of random lasers in compact sources and integrated optoelectronic devices.

Highlights

  • Compared to the conventional lasers, random lasers exhibit distinct physical characteristics due to their mirrorless cavity [1,2,3], such as multiple-direction emission and multiple-mode oscillation

  • The results show that the random lasing emission originates from the scattering between the perovskite crystal grains, and the decreased threshold is attributed to the increased active area of the perovskite film

  • We demonstrate that the perovskite random laser on the fiber facet can prevent speckle formation and improve image quality

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Summary

Introduction

Compared to the conventional lasers, random lasers exhibit distinct physical characteristics due to their mirrorless cavity [1,2,3], such as multiple-direction emission and multiple-mode oscillation. We report the fabrication of perovskite random lasers based on perovskite films deposited on the optical fiber facets using a dip-coating method.

Results
Conclusion

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