太赫兹辐射
光学
铌酸锂
切伦科夫辐射
材料科学
激光器
照相混合
太赫兹光谱与技术
远红外激光器
光电子学
物理
探测器
太赫兹超材料
作者
М. И. Бакунов,E. S. Efimenko,S. D. Gorelov,N. A. Abramovsky,S. B. Bodrov
出处
期刊:Optics Letters
[Optica Publishing Group]
日期:2020-06-24
卷期号:45 (13): 3533-3533
被引量:22
摘要
A nonlinear structure for efficient Cherenkov-type terahertz emission from ultrashort laser pulses is proposed, modeled, and experimentally demonstrated. The structure comprises a thin (a few tens of micrometers thick) layer of lithium niobate sandwiched between two silicon prisms. A focused-to-a-line laser pulse propagates in the layer and generates a Cherenkov wedge of terahertz radiation in the prisms. The radiation experiences total internal reflection in the prisms and emerges into free space as two adjacent beams collinear to the pump laser beam. The structure can generate a centimeter-wide terahertz beam with high transverse uniformity and a flat frequency spectrum. An optical-to-terahertz conversion efficiency as high as 0.35% is achieved with 10-µJ laser pulses. It can be further enhanced by reducing the thickness of the lithium niobate layer.
科研通智能强力驱动
Strongly Powered by AbleSci AI