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采用端面有效反射率法 ,从理论上计算了单片集成电吸收调制 DFB激光器 (Electroabsorption ModulatedDFB L aser,EML)的腔面反射率、耦合强度 (κL)对其波长漂移的影响 .同时在实验中通过改变腔面的反射率来验证计算结果 .理论与实验的结果表明 :为提高 EML 的模式稳定性 ,必须减小调制器一端的反射率 ,同时增加DFB激光器的 κL.最终我们采用选择区域生长 (Selective Area Growth,SAG)的方法 ,制作了低光反馈出光面的单脊条形 EML,在 2 .5 Gb/ s的非归零 (NRZ)码调制下 ,经过 2 80 km的标准光纤传输后 ,没有发现色散代价 . 相似文献
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采用端面有效反射率法,从理论上计算了单片集成电吸收调制DFB激光器(Electroabsorption Modulated DFB Laser,EML)的腔面反射率、耦合强度(κL)对其波长漂移的影响.同时在实验中通过改变腔面的反射率来验证计算结果.理论与实验的结果表明:为提高EML的模式稳定性,必须减小调制器一端的反射率,同时增加DFB激光器的κL.最终我们采用选择区域生长(Selective Area Growth,SAG)的方法,制作了低光反馈出光面的单脊条形EML,在2.5Gb/s的非归零(NRZ)码调制下,经过280km的标准光纤传输后,没有发现色散代价. 相似文献
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ZnSe基蓝绿色半导体激光器研究进展 总被引:4,自引:0,他引:4
在全彩色显示,高密度激光存储,高速打印,高分辨图像处理和战地生化检测等强力推动下,ZnSe基蓝绿色半导体激光器的研究近年来取得了里程碑式的研究结果。为了明确该领域的研究方向,以便分析在实用化进程中必须解决的主要问题。本文对ZnSe基蓝绿色半导体激光器及其相关材料的研究进展进行了较全面的评述,作为比较,对GaN基蓝绿色半导体激光器的发展情况和尚待解决的问题也进行了简要评述。 相似文献
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放大自发辐射注入波长锁定法布里-珀罗激光器 总被引:3,自引:0,他引:3
波分复用无源光网络(WDM-PON)被认为是接入网的最终解决方案,基于放大自发辐射(ASE)注入波长锁定法布里-珀罗(F-P)激光器的WDM-PON由于其价格低廉和容易实现颜色无关操作而受到极大关注.实验研究了ASE注入波长锁定F-P激光器的ASE增益、边模抑制比(SMSR)和相对强度噪声(RIN)随F-P激光器注入电流和ASE注入功率的变化关系,理论模拟了ASE注入功率和增益一定时,F-P激光器注入电流随其前端面反射率的变化关系,并从实验上进行了验证.研究结果表明,当F-P激光器的注入电流为阈值电流的1.3~1.7倍时,能获得满足应用需要的相对强度噪声和边模抑制比.对于一定的ASE注入功率和输出功率,存在使注入电流最小的最佳前端面反射率. 相似文献
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Be基蓝绿激光器载流子约束的LCAO理论研究 总被引:1,自引:1,他引:0
本征的强离子性,使ZnSe基半导体蓝绿激光器易于形成堆垛层错等退化缺陷,严重地影响了器件的寿命。人们便开始将注意力投向离子性较低的Be基化合物,希望用Be基Ⅱ-Ⅵ族材料取代ZnSe基材料,抑制蓝绿激光器的退化。要研制半导体激光器,电学限制层对发光活性层中载流子的约束能力(即能带的offset值)是最重要的基本参数之一。由于对Be基化合物的了解十分有限,本文从基本的原子参数出发,用原子轨道线性组合(LCAO)理论计算了所有Ⅱ-Ⅵ族化合物价带顶的相对位置,结合带隙的实验值,给出了Ⅱ-Ⅵ族化合物导带底的相对位置。简要分析了二元化合物用于BeTe中载流于约束的可能性。根据虚晶近似,用插值方法计算了与GaAs匹配的Be基四元合金相对与BeTe价带、导带的offset。对各四元合金的特征进行了分析对比,讨论了Be基四元合金用作我流子约束层的可能性。为制作Be基半导体蓝绿激光器提供了能带剪裁的理论依据。 相似文献
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Jens W. Tomm Mathias Ziegler Heiko Kissel Jens Biesenbach 《Journal of Electronic Materials》2010,39(6):723-726
We report additional infrared (IR) emission bands at about 1.0 eV and 1.4 eV from GaAs-based diode lasers that have their
primary emission at 808 nm (1.53 eV). Four long-wavelength bands are observed. They are assigned to bandtail-related luminescence
from the quantum wells (QW) as well as to interband- and deep-level-related luminescences from the GaAs substrates. Thermal
radiation is detected below 0.4 eV as well. By using a thermocamera, the defect-related emission was mapped for different
types of high-power diode lasers. The mechanisms causing enhanced IR emission from the devices and potential applications
of this type of monitoring are addressed. 相似文献
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考虑用激光器与调制器直接耦合以及耦合槽的影响,用散射矩阵法及二步等效反射率法,对沟槽耦合腔激光器的波长调谐和频率调制特性的分析表明,数学处理简单,物理图像清晰。 相似文献
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We experimentally and theoretically investigated the synchronization characteristics in all-optical synchronization and clock recovery of the passively mode-locked laser diode (MLLD), and the relationship with the optical-cavity resonant behaviors of the input optical signals in the cavity of the MLLD. The dependences on the wavelength detuning, the data format, the injection power, the mark-to-space ratio, the input data pattern, and the intensity fluctuations of the injected optical signals were experimentally discussed in detail. It was clearly concluded from the experimental results that the optical cavity-resonant behavior of the incoming optical signals in the cavity of the MLLD was a determinant factor of the locking mechanism in the all-optical synchronization of the MLLD and that the optical-injection locking mechanism was not a dominant effect. The experimental results were examined based on a simple theoretical model including the enhancement of the effective modulation due to the optical-cavity resonance. By using the model we succeeded in explanation of the trends of the experimental results. 相似文献
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《Photonics Technology Letters, IEEE》2008,20(21):1766-1768
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Guanwei Sun Xinyan Liu Zhe Liu Denghui Liu Fanyuan Meng Zhenchao Li Linghao Chu Weidong Qiu Xiaomei Peng Wentao Xie Chenyang Shen Jiting Chen Hin-Lap Yip Shi-Jian Su 《Advanced functional materials》2021,31(50):2106691
The band-edge electronic structure of lead halide perovskites (ABX3) is composed of the orbitals of B and X components and can be tuned through the composition and structure of the BX6 octahedron. Although A-site cations do not directly contribute to near-edge states, the bandgap of 3D metal halide perovskites can be affected by A-cations through BX6 octahedron tilting or lattice size variation. Here, as confirmed by the Rietveld refinement results of X-ray diffraction characterization, the competition between lattice expansion and octahedral tilting is identified for the first time in emission wavelength tuning when introducing a large A-site cation (C2H5NH3+, EA+) into 1-naphthylmethylammonium iodide-passivated CsPbI3 system. The former dominates spectral redshift, while the latter leads to a blueshift of emission peak, which broadens the way to tune the emission wavelength. In addition, excess cations can also passivate the perovskites, leading to a photoluminescence (PL) quantum yield as high as 61%, increased average PL lifetime of 74.7 ns, and a high radiative and non-radiative recombination ratio of 15.7. Eventually, spectral-stable deep-red perovskite light-emitting diode with a maximum external quantum efficiency of 17.5% is realized, which is one of the highest efficiencies without using any light outcoupling and anti-solvent techniques. 相似文献
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《Photonics Technology Letters, IEEE》2008,20(21):1784-1786
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文中介绍半导体激光二极管在信息传输以外的部分应用。随着激光二极管工艺和器件发展,他们在光通信以外的市场不断扩大,应用越来越广泛。本文介绍 LD 在医疗、测量、条形码扫描仪,以及光谱学方面的应用。 相似文献
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用分光光度计测定了12例兔角膜和1例人角膜的吸收光谱,结果表明波长小于300nm的准分子激光和波长在1.88μm~2.64μm,2.36μm~40μm的激光,均可对角膜进行切割并可望用于激光角膜矫正术。 相似文献
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蓝色波段发光和激光二极管的新进展 总被引:2,自引:2,他引:0
文章在简要概述了几种适合制备短波长发光器件材料-SiC,GaN和ZnSe的晶体结构、掺杂性质及外延技术后,主要介绍了它们在制备蓝色波段发光和激光二极管的新进展。 相似文献
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Hamamatsu的研究人员报道了一种无In的激光二极管,工作波长在342nm,这是迄今为止波长最短的电驱动半导体激光二板管。 相似文献