检索结果-南通市图书馆

Polaron effect on the optical rectification in spherical quantum dots with electric field

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2016年第10期25卷 446-451页

作者：冯振宇闫祖威 School of Physical Science and Technology Inner Mongolia University College of Science Inner Mongolia Agricultural University

The polaron effect on the optical rectification in spherical quantum dots with a shallow hydrogenic impurity in the presence of electric field is theoretically investigated by taking into account the interactions of the electrons with both confined and surface optical phonons. Besides, the interaction between impurity and phonons is also considered. Numerical calculations are presented for typical Zn1-xCdxSe/ZnSe material. It is found that the polaronic effect or electric field leads to the redshifted resonant peaks of the optical rectification coefficients. It is also found that the peak values of the optical rectification coefficients with the polaronic effect are larger than without the polaronic effect, especially for smaller Cd concentrations or stronger electric field.

关键词： polaron effect optical rectification spherical quantum dot

Theoretical Investigation on THz Generation from optical rectification with Tilted-Pulse-Front Excitation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2014年第12期31卷 49-51页

作者：牡海伟杨楠 Terahertz.Sensing and Imaging Team Center for Advanced Photonics RIKEN Sendal 9800845 Japan Lab for Laser Plasma (Ministry of Education) and Physics and Astronomy Department Shanghai Jiao Tong University Shanghai 200240

The Terahertz （THz） wave is a special electro- magnetic wave with frequency between 0.1 10THz （1 THz=1012 Hz）, which has been widely used in spec- troscopy, imaging and remote sensing. There are several THz wave sources based on ultrashort laser pulses, including photoconductor antenna, optical Dember effect, air-plasma and optical rectification. For THz generation from optical rectification, phase- matching condition between pump laser pulses and THz pulses has to be fulfilled to obtain a high con- version efficiency.

关键词： Theoretical Investigation optical rectification Tilted-Pulse-Front Excitation

Choice of optimal crystal-orientation for terahertz transceiver with zincblende crystal

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2011年第12期20卷 238-243页

作者：田晓光凌福日何健刘劲松姚建铨 Wuhan National Laboratory for Optoelectronics School of Optoelectronic Science and EngineeringHuazhong University of Science and Technology College of Precision Instrument and Optoelectronics Engineering Tianjin University

This paper presents a set of equations describing the terahertz generation and electro-optic detection based on optical rectification in zincblende crystals. The dependence of terahertz emission efficiency on the polarization of incident beam and crystal-orientation is discussed. For the experimental setup with a transceiver which transmits and detects terahertz radiation in the same crystal, we have demonstrated the optimal combination of both parameters above to optimize the working efficiency. Equations supplied in this paper are valid for zincblende crystals with arbitrary crystal- orientation and every possible polarization of an incident beam, which are of great significance for the optimization of a system.

关键词： terahertz transceiver optical rectification electro-optic detection optimal orientation

optically pumped terahertz sources

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2017年第12期60卷 1801-1818页

作者： ZHONG Kai SHI Wei XU DeGang LIU PengXiang WANG YuYe MEI JiaLin YAN Chao FU ShiJie YAO JianQuan Institute of Laser and Optoelectronics College of Precision Instrument and Opto-electronics Engineering Tianjin University Tianjin 300072 China Key Laboratory of Opto-eleetronics Information Technology (Ministry of Education) Tianjin University Tianjin 300072 China

High-power terahertz(THz) generation in the frequency range of 0.1-10 THz has been a fast-developing research area ever since the beginning of the THz boom two decades ago, enabling new technological breakthroughs in spectroscopy, communication, imaging,etc. By using optical(laser) pumping methods with near-or mid-infrared(IR) lasers, flexible and practical THz sources covering the whole THz range can be realized to overcome the shortage of electronic THz sources and now they are playing important roles in THz science and technology. This paper overviews various optically pumped THz sources, including femtosecond laser based ultrafast broadband THz generation, monochromatic widely tunable THz generation, single-mode on-chip THz source from photomixing, and the traditional powerful THz gas lasers. Full descriptions from basic principles to the latest progress are presented and their advantages and disadvantages are discussed as well. It is expected that this review gives a comprehensive reference to researchers in this area and additionally helps newcomers to quickly gain understanding of optically pumped THz sources.

关键词： terahertz(THz) wave photoconductive switch optical rectification difference frequency generation(DFG) terahertz parametric oscillator(TPO) photomixing THz gas lasers phase matching(PM)

THz source based on optical Cherenkov radiation

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2012年第1期55卷 27-34页

作者： YAO JianQuan1,2,LIU PengXiang1,2,XU DeGang1,2,LV YingJin1,2&LV Da1,2 1Institute of Laser&Optoelectronics,College of Precision Instruments and Opto-Electronic Engineering,Tianjin University,Tianjin 300072,China 2Key Laboratory of Opto-electronics Information Technology(Tianjin University),Ministry of Education,Tianjin 300072,China Institute of Laser & Optoelectronics College of Precision Instruments and Opto-Electronic Engineering Tianjin University Tianjin China Ministry of Education Key Laboratory of Opto-electronics Information Technology (Tianjin University) Tianjin China

Terahertz(THz)technique has attracted considerable interest due to its broad application prospects.THz source is a crucial part of THz science and technology.optical Cherenkov radiation in electro-optic crystals is a promising method of THz generation,because phase-matching is automatically satisfied.In this paper,we introduced two types of THz source based on optical Cherenkov radiation:both broadband and tunable monochromatic.The mechanism of radiation was analyzed and recent development was reviewed in detail.The future of THz source based on optical Cherenkov radiation was also forecasted.

关键词： Terahertz source optical rectification dierence frequency generation Cherenkov radiation