环境友好的近红外量子点激光器综合性教学实验设计  

Comprehensive teaching experiment design of environmentally friendly near-infrared quantum dot lasers

作　　者：廖晨 唐路平 LIAO Chen;TANG Luping(College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,China;College of Mechanical and Electronic Engineering,Nanjing Forestry University,Nanjing 210037,China;SEU-FEI Nano-Pico Center,Key Lab of MEMS of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,江苏南京210023 [2]南京林业大学机械电子工程学院,江苏南京210037 [3]东南大学MEMS教育部重点实验室SEU-FEI纳皮米中心,江苏南京210096

出　　处：《实验技术与管理》2024年第11期161-168,共8页Experimental Technology and Management

基　　金：国家自然科学基金项目(11704200,52001168);中央高校基本科研业务费专项资金项目(2242020k30039);光电教指分委“新工科建设与实践”教育教学研究项目(2020XGK29)。

摘　　要：铅盐量子点最低量子态的多重简并及其生物毒性,严重阻碍了近红外胶体量子点相干光源的发展。该文凝练团队创新科研成果,设计了环境友好的近红外量子点激光器综合性教学实验。该实验要求学生根据行业难题自主设计并搭建实验平台,深入研究环境友好的Ag_(2)Se量子点的光增益特性,并以此为基础研制低阈值的单模近红外量子点激光器,具有前沿性、创新性和挑战性。实验内容与光电类专业课程关联程度高,有助于培养学生灵活运用所学知识分析、解决问题的能力。通过文献调研、方案设计、光增益特性分析和激光器研制这一完整的研发过程,可显著提高学生的科研素养和实践创新能力,为他们参与科研攻关和产品研发奠定基础。[Objective]Experimental teaching is a crucial pathway for cultivating the innovative research thinking and engineering practice abilities of undergraduate students.Integrating these innovative research results into undergraduate comprehensive experiments is essential to maintaining their cutting-edge and innovative nature.Benefiting from the quantum confinement effect,quantum dots(QDs)exhibit gain thresholds that are insensitive to temperature and gain wavelengths that are broadly tunable with size.Near-infrared QD lasers have wide-ranging applications in optical communications,on-chip photonic interconnects,and emerging quantum information technologies.However,the multiple degeneracies of the lowest quantized states in lead salt(PbS and PbSe)QDs,along with their biological toxicity,have significantly hindered the development of near-infrared colloidal QD coherent light sources.Drawing from innovative research,this study has designed a comprehensive teaching experiment focused on environmentally friendly near-infrared QD lasers.[Methods]This experiment aims to cultivate the abilities of students and adopts a student-centered,heuristic,and interactive teaching method.Students are tasked with independently designing and building an experimental platform based on industry challenges.Ultrafast transient absorption spectroscopy is employed to track the establishment and relaxation of optical gain in environmentally friendly Ag_(2)Se QDs,determining their gain wavelength,threshold,and lifetime.A two-level model is then established to analyze the influence of the degeneracy of the lowest quantized states on the optical gain threshold.Subsequently,the characteristics of amplified spontaneous emission are measured using pulsed stripe photoexcitation experiments,and the net modal gain is evaluated using a one-dimensional optical amplification model by altering the pump stripe length.Finally,based on the optical gain characteristics of the QDs and the single-mode operation conditions of the laser,students design a low-thres

关 键 词：教学改革 Ag_2Se量子点 近红外 低阈值 激光器 

分 类 号：G642.0[文化科学—高等教育学] O433.1[文化科学—教育学] TN242[机械工程—光学工程]