形变共振腔提高激光器输出功率

椭圆形电泵浦微腔激光器具有以前报导的微盘激光器的优点，如激活介质的高效率，同时克服了从腔内耦合出可用光的某些困难。这种激光器也以特殊的“弓条形”模（而不是圆形微盘激光器的“回音廊”模）工作。这种最近由朗讯－贝尔实验室、耶鲁大学和德国马普物理所Ｃｌａｉ...     

InGaAsP多量子阱微盘激光器

采用湿法化学腐蚀在气洙ＭＢＥＩｎＧａＡｓＰ多量子阱材料上制作了微盘型激光器，直径８μｍ的微盘激光器表现出很好的单模激射特性，阈值泵浦功率为１７０μＷ，激射线宽为１．５ｎｍ．以微腔激光器的宽激射线宽作了初步分析。     

扫描电镜在研制新型的半导体微腔激光器─微盘激光器中的应用

本研究用扫描电镜（ＳＥＭ）电子束曝光技术和相应的计算机联机成像程序，在ＩｎＧａＡｓＰ／ＩｎＰ液相外延片上形成电子束光刻图形，并采用选择腐蚀等技术，由ＫＹＫＹ－１０００ＢＳＥＭ并附Ｘ射线能谱仪和图像处理系统对研制过程进行监控，成功地在国内首次研制出由ＩｎＧａＡｓＰ单量子阶分别限制的五层四元系组成的新型半导体微盘激光器，微盘直径为２－７μｍ，盘厚０．２－０．４μｍ。这一成功为开展半导体微盘激光器的研究打下了良好的基础。     

利用飞秒激光直写技术制备钙钛矿微盘激光器

利用溶液法制备的钙钛矿微/纳米晶虽然可以得到性能良好的微型激光器,但是其所需生长周期较长且缺乏重复性。为了解决这一问题,提出了利用飞秒激光直写技术制备高重复性钙钛矿微盘激光器的新方法。首先使用双源共蒸的方法在石英玻璃衬底上沉积FAPbI₃钙钛矿薄膜,然后采用飞秒激光直写技术在FAPbI₃钙钛矿薄膜上制备不同直径的微盘激光器,最后测试其激光性能。实验结果表明,随着微盘直径的增加,激光阈值呈线性增长,最终可实现约4.7μJ/cm²的极低激光阈值。利用飞秒激光直写技术制备的钙钛矿微盘激光器具有出色的激光性能,且重复性高,因此该技术非常适用于批量制备钙钛矿微盘激光器,为其产业化应用提供了可能。     

InGaN多量子阱面发射微盘激光器的理论研究

为了实现半导体微盘磁光器的单模面发射,设计了一种以ＩｎＧａＮ多量子阱为有源层,ＣａＮ外延层为覆盖层的半导体微盘激光器。通过对ＧａＮ覆盖层进行图形刻蚀,可以对不同的角模式进行有选择的增益,由此实现选模。用有效增益因子加电介质盘的模型对实际微盘结构进行简化,并根据此模型计算微盘外的远场分布,并进上步计算有效增益因子。分析表明,这种结构能够实现ｍ＝１角模式的面发射。     

不同过渡热沉封装微盘腔半导体激光器热分析

为了降低微盘腔半导体激光器工作时有源区的温度,提升封装的可靠性,基于Ansys Workbench有限元分析分别对AlN,WCu10,SiC,石墨烯,以及CVD金刚石过渡热沉封装的蜗线型微盘腔半导体激光器进行了热特性分析,得到了器件工作时的温度分布以及热应力、热应变分布.结果显示,SiC封装器件的有源区温度较AlN和WCu10封装器件分别降低了 2.18,3.078 C,并在五种过渡热沉封装器件中表现出最低的热应力,器件热应变最小.SiC过渡热沉封装可以有效降低微盘腔半导体激光器工作时的有源区温度,同时减少封装应力与器件应变,从而提高器件的散热能力和可靠性.计算结果对半导体激光器单管散热及阵列集成散热均有指导意义.     

Si_(3)N_(4)/WS_(2)/Al_(2)O_(3)三明治型纳米激光器结构参数优化EI北大核心CSCD

高性能的片上纳米激光器对通信、传感以及量子等领域的发展有着至关重要的意义。纳米激光器中高的光学限制因子可以保证更大的模式增益,实现更低的激光器阈值。首先阐明了借助物理气相沉积和原子层沉积制备Si_(3)N_(4)/WS_(2)/Al_(2)O_(3)三明治型纳米激光器阵列的工艺流程;构建了该纳米激光器的仿真模型,在仿真模型中对实际结构进行了简化并分析了Al_(2)O_(3)覆盖层厚度T、Si_(3)N_(4)微盘直径D和厚度H对光学限制因子的影响。光学限制因子随着Al_(2)O_(3)覆盖层T以及Si_(3)N_(4)微盘直径D的增加有先增加后减小的趋势,Si_(3)N_(4)微盘厚度H的减小也可以显著增加激光器的光学限制因子;最后展示了器件的荧光以及扫描电子显微镜的表征结果。该工作为集成光学芯片中可规模制备的高性能纳米激光器打下了良好基础。     

二维光子带隙缺陷模激光器

1946年 ,E.Purcell[1 ]首次提出 ,通过把原子置于具有电磁波长尺度的低损耗腔中 ,能显著改变原子激发态的自发发射。最近 ,随着半导体激光器的出现和晶体生长及制造工艺的改进 ,对具有自发发射控制[2～ 4] 的半导体光学微腔的设计制作已有日益增长的兴趣。垂直腔面发射激光器 (VCSEL) [5 ]是具有光波长尺度的首批半导体微腔之一 ,其光约束于两个外腔生长分布布拉格反射镜之间。微盘激光器 [6 ]是另一种微腔激光器件 ,它利用高折射率微盘边缘的全内反射形成低损耗的回音廊模式。这里介绍一类微腔激光器的初步实验结果 ,其光被限制在纳米制…     

新型III-V族变形微盘硅基混合激光器

文章中,我们设计了一种连接一个Si的输出波导的新型III-V族变形微盘硅基混合激光器,并通过BCB键合技术以及标准光刻将其制备。相比于传统圆形微盘激光器,该激光器实现了激光从硅波导的定向发射以及单纵模输出。实验上,在连续电流操作下,我们获得了0.31 mW的输出功率以及27 dB的边模抑制比。     

有机-无机杂化钙钛矿激光器的研究进展

有机-无机杂化钙钛矿具有载流子扩散长度长、发光效率高等特点,是一种性能优良的半导体材料,也是一种极具潜力的激光增益介质,受到了光伏、激光等多个领域的广泛关注.概述了利用有机-无机杂化钙钛矿作为增益介质研发的薄膜型多晶钙钛矿激光器、单晶钙钛矿激光器以及微盘钙钛矿激光器的研究进展.介绍了具有优异的电学性能和光学性能的有机-无机杂化钙钛矿制备方法,分析了影响有机-无机杂化钙钛矿激光器性能的主要因素.结果表明,相对于其他类型的激光器,单晶钙钛矿纳米线结构具有更低的激光阈值、更窄的光谱宽度,是实现纳米激光的最佳选择之一.此外,针对有机-无机杂化钙钛矿激光器目前存在的钙钛矿材料的降解、实现电泵浦激光所需电流密度高等问题,对今后钙钛矿激光器的研究重点和发展趋势进行展望.     

微碟激光器的单模低阈值激射

简单分析了碟型微腔激光器中的激射模式及自发发射系数。采用反应离子刻蚀和选择性刻蚀方法蚀刻出InGaAs InGaAsP多量子阱 (MQW)碟型激光器 ,碟直径 3 μm ,在液氮温度下进行光抽运实验 ,观察其模式特性。实现了单模激射 ,波长 1 5 μm ,抽运阈值 18μW。     

Improved optical filter responses in cascaded InGaAsP/InP microdiskresonators

Cascaded InGaAsP/InP microdisk resonators as optical filters are fabricated by deep dry-etching. Compared with single microdisk resonators, these higher-order filters show steeper rolloffs and flatter passbands. The bandwidth ratios of 15 to 3dB for the single, three and five cascaded microdisk resonator filters are ~2.4, 1.4 and 1.2     

A Compact SOI-Integrated Multiwavelength Laser Source Based on Cascaded InP Microdisks

We report on the performance of a compact multi- wavelength laser (MWL) source heterogeneously integrated with and coupled to a silicon-on-insulator (SOI) waveguide circuit. The MWL consists of four InP-based microdisk lasers, coupled to a common SOI wire waveguide. The microdisk lasers operate in continuous-wave regime at room temperature, with a threshold current around 0.9 mA and a waveguide-coupled slope efficiency of up to 8 muW/mA, for a microdisk diameter of 7.5 mum. The output spectrum contains four laser peaks uniformly distributed within the free-spectral range of a single microdisk. While thermal crosstalk is negligible, laser peak output powers vary up to 8 dB for equal microdisk drive currents, as a result of loss due to coupling with higher order modes supported by the 1-mum-thick microdisks. This nonuniformity could be eliminated by reducing the microdisk thickness.     

Photonic quantum ring laser of 3D whispering cave mode

A new whispering cave mode (WCM), a three-dimensional (3D) case of Lord Rayleigh's 2D whispering gallery modes, based upon 3D total internal reflection is presented, where GaAs quantum well (QW) near-vertical microdisk resonators exhibit a strong carrier-photon coupling for the QW carriers located in the Rayleigh band, generating 2D-to-1D carrier phase transitions of photonic quantum ring (PQR). It is a ‘photonic’ quantum corral effect (PQCE), whose simulation work produces a tangled web pattern of imminent recombinant carriers in picoseconds timescale. The PQCE is responsible for the ultralow threshold currents below 300 nA for a single mode GaAs PQR laser, and a prototype GaN PQR laser with a threshold near and below 1 μA.     

High-Q vertically coupled InP microdisk resonators

High-quality factor vertically coupled InP microdisk resonators have been fabricated. Wafer bonding techniques have been used as a main approach to enable this three-dimensional structure. The devices exhibit smooth sidewalls, single mode operation, and high-quality factors in excess of 7000     

A Polymer Microdisk Photonic Sensor Integrated Onto Silicon

Optical sensors are attractive for integrated chip-scale sensor systems. In this letter, integrated microdisk sensors have been fabricated and characterized for five different D-glucose concentrations in deionized water. The microdisk sensor reported is in an orthogonal configuration, reducing the sensor size toward chip-scale sensor applications. The measured wavelength shift in the resonant peak of the microdisk sensors has a linear response as a function of D-glucose concentration. The estimated sensitivity (defined by$Delta lambda_ resonant$/wt%$_ D-glucose$) of the fabricated microdisk sensor for the D-glucose solution was 0.12[nm/wt%] based on the slope of the linear regression line from the measured results.     

一种由强光担任摇摆器的新型自由电子激光器及其增益分析

提出了一种由超短脉冲双光束担任摇摆器的自由电子激光器的原理及设计方案,并在单电子近似的基础上给出了计算其增益的联立方程组,以用于数值模拟.指出了实现一种紧凑、廉价的可调谐光源的可能性.     

Room-temperature 1.3-μm lasing in a microdisk with quantum dots

Under study are temperature dependences of laser characteristics of a GaAs/(AlGa)_xO_y microdisk of 6 μm in diameter, fabricated using optical lithography, ion milling with a beam of Ar+ ions, and selective oxidation of the Al_0.97Ga_0.03As layer which forms the microdisk base. In As/InGaAs QDs are used as the microdisk active region. Room-temperature lasing in the 1.3-μm range is observed, with the threshold optical pumping power of 160 μW. The quality factor of microdisk modes is about 10⁴.