高亮度的太赫兹量子级联激光器,具有接近衍射限制的高斯光束
Rusong Li1,2,3, Yunfei Xu4, Shichen Zhang1
1Division of Quantum Materials and Devices, Beijing Academy of Quantum Information Sciences, Beijing, 100193, China.
Light, science & applications
|August 16, 2024
概括
这项研究引入了一种新的太赫兹 (THz) 光子晶体共振器,用于从量子级联激光器获得高亮度,单模表面辐射. 这一突破使得可扩展的THz源无需外部光学,推进成像和传感的应用.
科学领域:
- 光子学和太赫兹科学
背景情况:
- 高功率的太赫兹 (THz) 量子级联激光器对于医学,传感和通信至关重要.
- 由于模式竞争和子波长限制,将THz光束亮度与设备区域进行调整是具有挑战性的.
- 通常需要外部光学镜头来增强THz光束亮度.
研究的目的:
- 提出一个具有相位工程设计的金属THz光子晶体共振器.
- 在没有外部光学的情况下,在广的区域实现单模表面辐射.
- 为了实现高级应用的高亮度,大面积的THz源.
主要方法:
- 设计和制造一个金属THz光子晶体共振器.
- 阶段工程格子结构用于控制的表面排放.
- 输出功率,光束分歧和亮度的表征.
主要成果:
- 在3.88 THz时,达到超过185mW的峰值输出功率.
- 证明了窄光束的分歧 (4.4° × 4.4°).
- 获得远光亮度 (1.6 × 10^7 W sr^-1 m^-2) 从一个大的1.6 × 1.6 mm^2设备面积.
- 在没有外部透镜的情况下实现了接近衍射限制的M^2因子 (1.4).
结论:
- 阶段工程共振器使稳定,高强度的表面辐射在一个广的区域.
- 这项技术是大规模THz发射器的理想光吸收器.
- 为高亮度固态THz激光器和局成像和检测的新应用铺平了道路.
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