| 1. | The spatial profile of the pulsed jn - beam remains jn - shape unchanged upon propagation , whereas its temporal profile depends on diffraction and the material ' s dispersion
. 1习jjjlee | jjjj输过程中保持j 。形状不变，时间波形依赖于材料色散和衍射。 |
| 2. | When the spatial parameter a is small , the non - paraxial effect does n ' t affect the temporal profile of the beam . however , when a becomes relatively larger , it influences the temporal profile greatly
当空间参数较小时超短脉冲贝塞尔光束的时间波形不受非近轴效应影响；然而当空间参数较大时，非近轴效应影响超短脉冲贝塞尔光束的时间波形。 |
| 3. | The results show that there is gain narrowing when pump is gaussian temporal profile and it ' s pulse width close to signal ' s and that the spectrum extended in the case of saturated amplification when pump is near top - hat temporal profile
在泵浦光为高斯时间波形且脉宽与信号光差不多时，出现增益窄化；而当泵浦光近似为时间平顶时，饱和放大后光谱增宽。 |
| 4. | We also use fourth runge - kutta method simulate the opcpa process in the case of considering signal and pump temporal profile and phase mismatching and get gain and spectra properties at different pump temporal profile
我们还在考虑时间波形和相位失配的情况下，利用四阶龙格-库塔法对光参量啁啾脉冲放大进行了数值模拟计算，得到了不同泵浦光时间波形时的增益与频谱特性。 |
| 5. | After the section of right side nxiits in budgerigar in the original sound wave ' s expanded time window , the higher amplitude pulse and the lower amplitude pulse exchanged alternately and also the higher amplitude is approximately as twice as the lower amplitude
虎皮鹦鹉在断右侧nxllts后，原始时间波形展开图中出现了各脉冲振幅一高一低相间的交替更换，且高振幅脉冲的振幅约为低振幅脉冲的两倍。 |
| 6. | In particular , based on the complex analytical signal theory , the solutions for the components of a pulsed gaussian - like beam in rectangular symmetry are derived and compared with those derived from slowly - varying - envelop - approximations ( svea )
本部分给出了时间波形为gauss 、 hyperbolicsecant和lorentz的脉冲光束奇异性的计算模拟，并给出了解决这些奇异性的复解析信号( complexanalyticalsignal )解。 |
| 7. | In this paper , a model developed by t . d . dorney and d . duvillaret et al is used to discuss the principle and method for optical constants extracting . the real refractive index and extinction coefficient of materials and the extraction of other material parameters are also discussed
Duvillaret等人提出的模型的基础上研究了从thz时间波形中提取材料的光学常数(实折射率和消光系数)的原理、方法，并对于如何得到材料的其他物理参数进行了探讨。 |
| 8. | Abstract : by using the pulse - sequence model ， the inverse problem of amplification of broad - spectral - bandwidth laser pulse has been studied ， i . e . ， to find the initial input temporal pulse profile ， spatial profile ， spectral distribution and fluence from the required output temporal ， spatial pulse profile ， spectral distribution and fluence as well as the given amplifier parameters
文摘:采用脉冲分割模型，研究了宽频带激光脉冲放大的逆问题，即由所要求的输出激光脉冲时间、空间波形、光谱分布和能量密度，并给定放大器参数情况下，求输入激光脉冲时间波形、空间、光谱分布。 |
| 9. | A coherent electromagnetic pulse in the range between the far - infrared and microwave region is used as a detection source . the amplitude of the wave is recorded by electro - optical or photoconductive sampling . after fast fourier transform , the amplitude and phase of the wave is given , then the complex refractive index standing for the absorption and dispersion of the material in thz region is extracted
Thz ( 10 ~ ( 12 ) hz )时域光谱技术是20世纪90年代发展起来的一种新型的光谱测量技术，它使用频率介于远红外和微波之间的相干电磁辐射脉冲作为探测源，利用电光取样或光电导取样的方法直接记录thz辐射电场的振幅时间波形，通过傅立叶变换得到测量信号振幅和相位的光谱分布，进而获得材料在thz波段的复介电常数，即色散及吸收等信息。 |
