分布反馈式太赫兹量子级联激光器在光场自注入下的动力学  

Dynamic Behavior of Distributed Feedback Terahertz Quantum Cascade Lasers in Self-Injection of Optical Field

作　　者：葛磊 楚卫东[2] 杨宁[2] Ge Lei;Chu Weidong;Yang Ning(Beijing Computational Science Research Center,Beijing 100094,China;Institute of Applied Physics and Computational Mathematics,Beijing 100088,China)

机构地区：[1]北京计算科学研究中心,北京100094 [2]北京应用物理与计算数学研究所,北京100088

出　　处：《激光与光电子学进展》2024年第15期239-245,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金委基础科学中心项目(12088101);中国博士后科学基金面上项目(2022M710331)。

摘　　要：基于Lang-Kobayashi方程并引入可用于描述分布反馈式光栅对腔内光场耦合效应的修正端面反射系数,研究了分布反馈式太赫兹量子级联激光器在不同光场自注入强度下的动力学响应行为。随着自注入光场强度的增加,激光器由稳态向周期态、准周期态,甚至混沌状态过渡,但是太赫兹量子级联激光器和传统半导体激光器相比,可以在更大的自注入强度下保持稳定。移动目标反射物时,工作在稳态、周期态和准周期态下的分布反馈式太赫兹量子级联激光器的输出信号可正确描述反射物的移动规律,但处于混沌状态的激光器输出信号将出现失真。通过与典型稳态解模型对比可知,所提理论模型可提供更精确的输出信号规律。该研究为描述有光栅结构的量子级联激光器的动力学行为提供了理论支撑,也从理论上探索了分布反馈式太赫兹量子级联激光器在自注入成像技术应用中的可能。The study explores the dynamic response behavior of distributed feedback terahertz quantum cascade lasers under varying self-injection intensities of the optical field,utilizing the Lang-Kobayashi equation alongside a newly introduced modified end face reflection coefficient.This coefficient describes the coupling effect of distributed feedback gratings on the intracavity optical field.With increasing intensity of the self-injected light field,the laser transits from a steady state to a periodic,quasiperiodic,or chaotic state.Notably,compared to the conventional semiconductor lasers,terahertz quantum cascade lasers exhibit stability under larger self-injected intensities.Upon manipulating the target reflector,the output signal from a distributed feedback terahertz quantum cascade laser,operating in steady,periodic,and quasiperiodic states,can accurately describe the movement law of the reflector.However,in a chaotic state,the laser’s output signal appears distorted.Comparing with the typical steady-state solution models reveal that the proposed theoretical model furnishes more accurate output signal patterns.This study provides theoretical support for articulating the dynamic behavior of quantum cascade lasers with grating structures,and explores the potential of distributed feedback terahertz quantum cascade lasers in the application of self-injection imaging technology.

关 键 词：太赫兹 量子级联激光器 分布反馈式光栅 激光自注入 

分 类 号：O436.1[机械工程—光学工程]