Finally , we study the effect of longitudinal wakefield in the propagation of intense laser in plasma and find that this effect leads to asymmetric self - phase modulation of the pulse 最后研究了尾波场效应对激光传输的影响，发现纵向尾波场效应将导致激光脉冲不对称自相位调制。
3 . the growth of the lpfgs written by high - frequency co2 laser pulses is studied . a number of lpfgs are made by using different optical fibers , for the first time , to our knowledge 3 、研究了高频co2激光脉冲写入长周期光纤光栅的生长过程，并发现了不同光纤写入光栅的生长过程各不相同。
In fact , there are many elements which influence the special character , such as the intensity and frequency of the laser , the binding energy of atom , an additional field and so on 实际上，有许多因素会影响到谐波谱线的具体性质。例如：所加激光脉冲的强度和频率，原子的电离势以及外加的磁场或电场等。
The frequency upshifting and differential cross section of the laser synchrotron source ( lss ) are studied based on the thomson backscattering of intense laser radiation from a counterstreaming relativistic electron 摘要研究了逆流相对论电子与激光脉冲相互作用获得激光同步辐射的频率上移、微分散射截面等特性。
In the case of ultrashort laser pulse , the effect of finite pulse length is anlyzed , and self - steepening in the front of the pulse will occur when only relativistic nonlinearity is considered 同时，对于超短脉冲传输，分析了有限脉冲宽度效应对傍轴方程的修正，当只考虑相对论性非线性效应时将会引起激光脉冲前沿自陡峭。
In addition , ba6 - 3xnd8 + 2xti18o54 ( bnt ) ceramics is another important microwave dielectric material due to its applications in antenna duplexor , but the characteristics of bnt thin films have rarely been reported 同时，我们采用激光脉冲沉积法制备了ba6 - 3xnd8 + 2xti18o54 （ bnt ）薄膜。 bnt是另一类被广泛研究的微波介质材料。
The fast - ignition technique is more like a petrol engine : first the fuel is compressed and only then is it ignited by a second laser pulse ? acting as a spark plug ? that is fired through a hole in the pellet 快速点燃法更象汽油发动机：首先压缩燃料，此后才通过燃料球上的一个小孔，用第二的激光脉冲发射器发射激光? ?起点火器的作用? ?将其点燃。
However , to suppress high order modes , bending multimode fiber will bring additional power wastage , which will affect the output characteristics of fiber amplifiers and fiber lasers , such as the gain and pulse energy 对多模光纤采取弯曲来抑制高阶模的方法带来了额外的功率损耗,这个额外的损耗对光纤放大器的增益以及输出的激光脉冲能量都会造成影响。
The testing principle of the system is explained and the two components of the system including the optical heterodyne measurement system and the system of ultrasound pulse generated by a laser pulse are introduced 课题采用一种结构简单、易调试的光外差超声无损探伤系统,对其探伤机理进行了说明,介绍了组成系统的两部分:光外差测量系统和激光脉冲激励超声部分。
With the development of mode - locked laser , the pulse ’ s width becomes narrower and narrower , and exhibits more and more applications in many fields . obviously , these developments and applications demand improvements of measurement of pulse 随着激光锁模技术的不断发展,激光脉冲的宽度越来越窄,从而得到了越来越广泛的应用,这就要求脉冲测量手段不断提高。
