Strong spectral broadening of Cherenkov-type terahertz radiation by free carrier generation

被引：2
|
作者：
Efimenko, E. S. [1 ,2 ]
Abramovsky, N. A. [1 ]
Bakunov, M. I. [1 ]
机构：
[1] Univ Nizhny Novgorod, Dept Radiophys, Nizhnii Novgorod 603022, Russia
[2] Russian Acad Sci, Inst Appl Phys, Nizhnii Novgorod 603950, Russia
来源：
PHYSICAL REVIEW A | 2023年 / 107卷 / 01期
基金：
俄罗斯科学基金会;
关键词：
FREQUENCY UP-CONVERSION; PULSE-FRONT EXCITATION; OPTICAL RECTIFICATION; CERENKOV RADIATION; WAVE GENERATION; LASER-PULSES; SEMICONDUCTORS; ABSORPTION; LINBO3; TIME;
D O I：
10.1103/PhysRevA.107.013526
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Free carrier generation is commonly viewed as detrimental to the optical-to-terahertz conversion efficiency in electro-optic crystals due to free carrier absorption of terahertz radiation. Contrary to this view, we show by numerical simulation that free carrier generation can have a positive effect on the Cherenkov-type terahertz emission from ultrashort laser pulses by strongly broadening the radiation bandwidth. The broadening is produced by terahertz emission from a surge current of the optically generated carriers, which are accelerated by the rectified electric field. Specific results are obtained for GaP pumped at a 1.7-mu m wavelength.
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页数：11
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