·核科学与工程·激光与半导体材料相互作用的双电子共振吸收模型*秦可勉1，潘玉贺1，茆亚南1，安恒2，张晨光2，赵江涛1，王铁山1，彭海波1（1.兰州大学核科学与技术学院，兰州730000；2.兰州空间技术物理研究所，兰州730000）摘要：通过提出双电子共振吸收模型，解释了激光与半导体材料相互作用时材料吸收光子的物理机制，分析了温度、掺杂数密度对吸收系数的影响；结合热峰模型，将激光的能量注入视为热源，计算出了激光入射时材料中电子温度的时空演化，通过费米狄拉克分布计算出自由电荷数密度分布，得到了电荷激发过程的计算模型，模拟了激光诱发单粒子翻转的过程。模拟结果表明，激光能量与激发电荷总量的关系是非线性的，这意味着激光能量与粒子的线性能量传输之间为非线性对应关系，与实验结果相符。关键词：脉冲激光；双电子共振吸收模型；热峰模型；单粒子效应中图分类号：TN386.1文献标志码：Adoi:10.11884/HPLPB202335.220376Two-electronresonanceabsorptionmodeloflaser-semiconductorinteractionQinKemian1，PanYuhe1，MaoYa’nan1，AnHeng2，ZhangChenguang2，ZhaoJiangtao1，WangTieshan1，PengHaibo1（1.SchoolofNuclearScienceandTechnology,LanzhouUniversity,Lanzhou730000,China;2.LanzhouInstituteofPhysics,Lanzhou730000,China）Abstract：Thisworkproposesatwo-electronresonanceabsorption(TERA)model,whichexplainsthereasonforlaser-inducedsingleeventupset(SEU):whentheenergyofasinglephotonisnotenoughtoexcitetheelectron-holepair,therewillbede-excitationfromafree-electronwithhigherenergyintheconductionbandtoprovideextraenergytoexcitetheelectronsinthevalencebandtotheconductiveband.Thismodelcanexplainthephysicalmechanismofthematerial’sabsorptionofphotonsinthelaser-semiconductormaterialinteractionandexplaintheeffectoftheambienttemperatureanddopingconcentrationofthematerialontheabsorptioncoefficientthroughtheimportanceoftheconcentrationofhigh-energyelectronsintheconductionbandforTERA.Inoursimulation,weuselaserastheenergysourceforthethermalspikemodel,andthespatial-temporalevolutionoftheelectronictemperatureinthematerialduringthelaserradiationissimulated.Therefore,thechangeinabsorptioncoefficientcanbeexplainedbytheTERA.Moreover,accordingtotheFermi...
