Efficient Cherenkov-type optical-to-terahertz converter with terahertz beam combining

被引：22
作者：
Bakunov, M., I [1 ]
Efimenko, E. S. [2 ]
Gorelov, S. D. [1 ]
Abramovsky, N. A. [1 ]
Bodrov, S. B. [1 ,2 ]
机构：
[1] Univ Nizhny Novgorod, Nizhnii Novgorod, Russia
[2] Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod, Russia
来源：
OPTICS LETTERS | 2020年 / 45卷 / 13期
基金：
俄罗斯科学基金会;
关键词：
ULTRASHORT LASER-PULSES; GENERATION; RECTIFICATION; CONVERSION; RADIATION;
D O I：
10.1364/OL.391871
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
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-mu J laser pulses. It can be further enhanced by reducing the thickness of the lithium niobate layer. (C) 2020 Optical Society of America
引用
收藏
页码：3533 / 3536
页数：4
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