摘要
Random lasers are a type of lasers that lack typical resonator structures,offering benefits such as easy integration,low cost,and low spatial coherence.These features make them popular for speckle-free imaging and random number generation.However,due to their high threshold and phase instability,the production of picosecond random lasers has still been a challenge.In this work,we have developed three dyes incorporating polymer optical fibers doped with various scattering nanoparticles to produce short-pulsed random fiber lasers.Notably,stable picosecond random laser emission lasting600 ps is observed at a low pump energy of 50μJ,indicating the gain-switching mechanism.Population inversion and gain undergo an abrupt surge as the intensity of the continuously pumped light nears the threshold level.When the intensity of the continuously pumped light reaches a specific value,the number of inversion populations in the“scattering cavity”surpasses the threshold rapidly.Simulation results based on a model that considers power-dependent gain saturation confirmed the above phenomenon.This research helps expand the understanding of the dynamics behind random medium-stimulated emission in random lasers and opens up possibilities for mode locking in these systems.
作者
杜文彧
高森
张小娟
李思祺
蒯雁
王治强
曹志刚
徐峰
刘宇
徐林
张俊喜
谢康
俞本立
胡志家
Wenyu Du;Sen Gao;Xiaojuan Zhang;Siqi Li;Yan Kuai;Zhiqiang Wang;Zhigang Cao;Feng Xu;Yu Liu;Lin Xu;Junxi Zhang;Kang Xie;Benli Yu;Zhijia Hu(Information Materials and Inteligent Sensing Laboratory of Anhui Province,Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education,School of Physics and Opto-electronics Engineering,Anhui University,Hefei 230601,China;School of Instrument Science and Opto-electronics Engineering,Laboratory of Optical Fibers and Micro-nano Photonics,Hefei University of Technology,Hefei 230009,China;School of Opto-electronic Engineering,Zaozhuang University,Zaozhuang 277160,China)
基金
supported by the National Natural Science Foundation of China(Nos.12174002,11874012,11874126,and 51771186)
the Excellent Scientific Research and Innovation Team of Anhui Province(No.2022AH010003)
the Key Research and Development Plan of Anhui Province(No.202104a05020059)
the Innovation Project for the ReturnedOverseasScholarsofAnhuiProvince(No.2021LCX011)
the University Synergy Innovation Program of Anhui Province(No.GXXT-2020-052)
the Anhui Young Wanjiang Scholars Talent Project(No.Z010118167)。