With rapid advances in femtosecond pulsed laser techniques , ultrashort few - cycle , even single - cycle pulses can be produced in laboratory 随着飞秒脉冲激光技术的迅速发展，实验室已经能够产生几个光周期和接近一个光周期的超短脉冲。
For ultrashort few - cycle pulses , the group velocity dispersion should be considered , whose influence depends on the parameters of the beam and the material 对于几个光周期的超短脉冲，除透镜色差外，还应当考虑群速度色散，且其影响依赖于透镜材料和光束参数。
Many nonlinear optical effects such as spm , xpm and fwm play important roles in the evolutions of optical pulses in the loop mirrors 利用构成非线性环的光纤中发生的不同非线性效应(自相位调制、交叉相位调制与四波混频效应) ，可以实现超短脉冲的非线性光开关特性。
The reflected light spectrum from interaction of uv laser with solid plasma was measured to investigate the frequency shift due to doppler effect of expanding critical density 测量了紫外超短脉冲激光等离子体中的光谱频移，分析表明是有质动力和等离子体热压力共同作用的结果。
This system uses a ring structure instead of complex multiangular optics structure . stimulate raman scatter is used to combine laser beam and it also improve the quality of laser beam 采用这个激光能量储存环技术能提高准分子激光放大超短脉冲激光的效率，获得高功率，高束质的激光输出。
In chapter 3 , spatiotemporal instability of ultrashort pulses results from the interplay among diffraction , group - velocity dispersins and nonlinearity . we use the model proposed by brebec et al . , 第三章：超短脉冲的时空不稳定性是衍射、群速度色散和自相位调制三者之间的相互作用导致的。
We built a table - top ultrashort laser system which based on ti : sapphire front - end and discharge pumped krf amplifier . with double pass off - axis amplification module , the imj uv pulse was amplified to 50mj 建立了桌面krf超短脉冲激光系统，采用放电泵浦krf准分子激光放大器进行超短脉冲激光的直接放大。
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。
The corresponding numerical investigations are carried out and show that for the pulses as short as sub - cycle , svea will cause the spatial singularity for both transverse and longitudinal components of the light field 在第三节里，我们考虑了超短脉冲光束在傍轴近似下的矢量传输特性，并且得到了横向场和纵向场传输的积分解。
5 . without making the paraxial approximation , a detailed study on the propagation of ultrashort pulsed bessel beams in linear normal and anomalous dispersive media has been performed using the method of fourier transform 未作近轴近似的条件下，用傅立叶积分变换法详细研究了超短脉冲贝塞尔光束在正、负色散介质中的传输特性。
