Circularly-Symmetric Grating, Surface-Emitting SemiconductorLaser

圆对称光栅、面发射半导体激光器

• 批准号: 9112973
• 负责人: Dennis Hall
• 金额: $ 29.98万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-15 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9112973&HistoricalAwards=false
• 关键词: Circularly; Symmetric; Grating; Surface; Emitting

The research team will investigate the fabrication and performance of circularly-symmetric-grating, surface-emitting (CSGSE) semiconductor lasers. The objective of the research is the development and demonstration of an AlGaAs-GaAs semiconductor laser that emits a beam with a circular cross-section. Such a laser has the potential to improve the efficiency with which light can be coupled into an optical fiber, to reduce the divergence of the emitted beam, and to serve as the basic element in a two- dimensional phase-locked array. Circular grating will be fabricated in AlGaAs-GaAs semiconductor laser structures, grown my molecular beam epitaxy, using electron-beam writing and chemically-assisted ion-beam etching. Quantum-well laser structures grown on misoriented GaAs substrates will be used to obtain the highest quality material and the lowest threshold current density possible, and to minimize the possibility of filamentary lasing. The circular grating will operate to produce oscillating laser modes in the waveguide that are radially inward- and outward-going circular waves. The use of a second-order grating will allow a circularly- symmetric beam to be coupled out of the laser through the surface. The fabrication and experimental evaluation of the laser will be accompanied and guided by theoretical analysis.

研究小组将调查 的制造和性能 圆对称光栅， 表面发射（CSGSE） 半导体激光器 客观 研究的重点是 和AlGaAs-GaAs的演示 半导体激光器，其发射 具有圆形横截面的梁。 这种激光器有可能 提高效率， 光可以被耦合到光学器件中， 纤维，以减少发散 发射的光束，并作为 这是一个基本的元素，在两个- 三维锁相阵列 将制作圆形光栅 在AlGaAs-GaAs半导体激光器中 结构，我的分子束 外延，使用电子束写入 和化学辅助离子束 蚀刻 量子阱激光器 取向错位GaAs上生长结构 基板将用于获得 最高品质的材料和 最低阈值电流密度 尽可能地，并尽量减少 有可能产生激光。 圆形光栅将操作以 产生振荡激光模式， 所述波导径向地 进出循环线 波 使用二阶 光栅将允许一个圆形的- 对称光束耦合输出 激光穿过表面。 的 制作和实验 激光器的评价将是 伴随和引导， 理论分析