概括
无序的量子级联垂直外腔表面发射激光器 (VECSEL) 通过定位横向模式来实现宽带太赫兹 (THz) 发射. 这种方法促进了多模式激光,提供了一个新的THz源.
科学领域:
- 光学和光子学 在光学和光子学.
- 半导体设备 半导体设备
- 特拉赫兹 (THz) 技术技术
背景情况:
- 量子级联激光器 (QCL) 对于THz生成至关重要.
- 垂直外腔表面发射激光器 (VECSEL) 在光束质量和可扩展性方面具有优势.
- 超表面为控制纳米级光物质相互作用提供了一个平台.
研究的目的:
- 展示和探索基于无序放大元面的量子级联 (QC) VECSEL,作为宽带,多模式的THz源.
- 为了研究结构障碍对模式定位和激光特征的影响.
- 为了实现多模式激光,以增强THz的产生.
主要方法:
- 制造具有无序元表面的QC-VECSEL,具有伪随机变化的脊天线宽度.
- 无序元表面与均元表面的比较.
- 光电流的非线性,角度依赖的辐射光谱和多模式激光的表征.
- 分析空洞长度与VECSEL模式数量之间的关系.
主要成果:
- 无序的元表面支持高度局部化的横向模式,在QC增益材料中减少空间重叠.
- 设备表现出非线性光流特征和取决于角度的发射光谱.
- 实现了宽带多模式激光,最多有17种同时模式,覆盖680 GHz.
- 由于衍射损失,VECSEL模式的数量与空腔长度的反向关系.
结论:
- 无序的元表面对于在QC-VECSEL中实现多模式激光是有效的.
- 结构性障碍促进空间洞燃烧,导致宽带THz发射.
- 这些VECSEL代表了一个有前途的新类可调节的多模式THz源.
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