摘要
计算了InGaAs/AlGaAs量子阱的激射波长与阱垒厚度的关系,并通过Rsoft软件计算了不同温度下的材料增益特性.计算并分析了渐变层厚度对分布布拉格反射镜(distributed Bragg reflectors,DBRs)势垒尖峰及反射谱的影响,通过传输矩阵理论得到P-DBR和N-DBR的反射谱和相位谱.模拟了垂直腔面发射激光器(vertical surface emitting lasers,VCSEL)结构整体的光场分布,驻波波峰与量子阱位置符合,基于有限元分析模拟了氧化层对电流限制的影响.通过计算光子晶体垂直腔面发射激光器(photonic crystal vertical cavity surface emitting lasers,PC-VCSEL)中不同的模式分布及其品质因子Q,证明该结构可以有效地实现基横模输出.通过光刻、刻蚀、沉积、剥离等半导体工艺成功制备出氧化孔径为22μm的VCSEL和PC-VCSEL,VCSEL的阈值电流为5.2 mA,斜率效率0.67 mW/mA,在不同电流光谱测试中均是明显的多横模输出;PCVCSEL的阈值电流为6.5 mA,基横模输出功率超过2.5 mW,不同电流下的边模抑制比超过25 dB,光谱宽度小于0.2 nm.
As a key part of vertical cavity surface emitting laser(VCSEL),active region will seriously affect the threshold and efficiency of the device.To obtain the appropriate laser wavelength and material gain,the design of In0.18Ga0.82As strain compensated quantum well is optimized.The relationship between the lasing wavelength of multiple quantum wells(MQWs)and the thickness is calculated.Considering the influence between the active region temperature and the lasing wavelength,the thickness of the quantum well is chosen as 6 nm,and the quantum barrier thickness is chosen as 8 nm,corresponding to the lasing wavelength of 929 nm.The material gain characteristics of the MQWs at different temperatures are simulated by Rsoft.The material gain exceeds 3300/cm at 300 K,and the temperature drift coefficient of the peak wavelength is 0.3 nm/K.In this work,Al0.09Ga0.91As and Al0.89Ga0.11As are chosen as the high-and the low-refractive index material of distributed Bragg reflector(DBR),and 20 nm graded layer is inserted between two types of materials.The influence of the graded layer thickness of DBR on the valence band barrier and reflection spectrum are calculated and analyzed.The increase of graded layer thickness can lead the band barrier peak and the reflection spectrum bandwidth to decrease.The reflection spectrum and phase spectrum of P-DBR and N-DBR are calculated by the transmission matrix mode(TMM):the reflectance of DBR is over 99%and the phase shift is zero at 940 nm.The optical field distribution of the whole VCSEL structure is simulated,in which the standing wave peak overlaps with the active region,and the maximum gain can be obtained.Using the finite element method(FEM),the effect of oxidation confined layer on the injection current is simulated.The current in the active region is effectively limited to the position corresponding to the oxidation confined hole,and its current density is stronger and more uniform.The optical field distributions in different modes of photonic crystal-vertical cavity surface emittin
作者
潘智鹏
李伟
吕家纲
聂语葳
仲莉
刘素平
马骁宇
Pan Zhi-Peng;Li Wei;LüJia-Gang;Nie Yu-Wei;Zhong Li;Liu Su-Ping;Ma Xiao-Yu(National Engineering Research Center for Optoelectronic Devices,Institute of Semiconductors,Beijing 100083,China;College of Materials Science and Optoelectronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第11期221-230,共10页
Acta Physica Sinica
基金
国家自然科学基金(批准号:62174154)资助的课题.
关键词
垂直腔面发射激光器
光子晶体垂直腔面发射激光器
基横模
大功率
vertical cavity surface emitting laser
photonic crystal-vertical cavity surface emitting laser
fundamental transverse mode
high power
