摘要
为实现超宽带的微波/毫米波测试,基于飞秒激光技术设计并搭建了一套光学谐波混频系统。该系统采用飞秒激光脉冲序列作为光载波,利用飞秒脉冲包络信号的高次谐波与被测信号进行混频,将被测信号下变频至直流进行进一步测量。由于飞秒脉冲序列特有的宽带谐波成分,该系统能够实现100 GHz以上测试带宽。利用该系统分别测试了6.56 GHz与100 GHz的天线口面场的电场幅度分布,并与微波仿真结构进行了比较,实验与仿真结果吻合,验证了该设计的正确性。设计中采用的谐波混频器为基于泡克耳斯效应的铌酸锂电光晶体。
An optical harmonic mixing system based on femtosecond laser technology is designed and built for ultra- wideband microwave/millimeter wave measurement. In the system, femtosecond laser pulse train is utilized as the light carrier, and the signals under test are mixed with the high order harmonics of the femtosecond pulse envelope function, and then are down-converted into direct current （DC） for further measurement. Since femtosecond pulse train is characterized with wide-banded harmonics, the present system could cover a measurement bandwidth of 100 GHz. Aperture electric field amplitude distributions of 6.56 GHz and 100 GHz antennas are measured, respectively, using such system and the experiment results are corresponding well with electromagnetic simulations, which proves the correctness of the design. Besides, the harmonic mixer is achieved by using an electro-optical crystal（i.e. LiNbO3） based on Pockels＇ effect.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第9期334-338,共5页
Laser & Optoelectronics Progress
基金
国防科工局计量专项(JSJC2013210C42)
国家国际科技合作专项(2011DFA12430)
中电集团创新基金项目(JJ120224
JJ130103)
安徽省重大科学仪器专项(1310115190)
关键词
超快光学
谐波混频
电光效应
超宽带
ultrafast optics
harmonic mixing
electro-optic effect
ultra-wideband
