摘要
针对冲击波和爆轰物理实验中对光开关的使用要求,提出了一种基于布拉格衍射效应的行波式声光开关,得到了声光开关的开关波形、消光比、抗激光损伤特性及能量利用率等。结果表明,与传统的普克尔电光开关相比,声光开关有效地消除了开关光信号顶部的"振铃"现象,消光比达到5000∶1,同时减小了开关体积、提高了开关工作稳定性。声光晶体抗激光损伤阈值大于2.26 kW/cm2,开关能量利用率达70%。开关触发固有延迟和上升沿时间分别为900和440 ns,满足测试系统对开关同步性的要求。另外开关光信号宽度可由触发信号任意调节,能满足不同测试情况的需要。
A travelling wave acoustooptic switch based on Bragg diffraction was proposed according to the requirement for optical switches used in shock wave and detonation physics experiments. Some important parameters of this acoustooptic switch such as the switch waveform, extinction ratio, light damage threshold and energy availability were experimentally obtained. The results show that compared with electrooptic switches, the acoustooptic switch effectively eliminates the ringing phenomena existing on the top of light switch waveforms, reduces the instrument volume, and improves the working stability. The extinction ratio is about 5000 ： 1. The light damage threshold of the acoustooptic crystal is larger than 2. 26 kW/cm^2 and the energy availability of the switch reaches up to 70%. The inherent delay time and rising edge time are 900 ns and 440 ns, respectively, which meet the synchronism requirement of the measuring system. In addition, the duration of the switching time can be easily changed by the trigger signal to meet different test demands.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2009年第1期45-48,共4页
Explosion and Shock Waves
关键词
爆炸力学
声光开关
声光调制
开关波形
消光比
激光干涉测速
mechanics of explosion
acoustooptic switch
acoustooptic modulation
switch waveform
extinction ratio
laser interferometry for measuring velocities
