thzs造句

• Secondly, basing on the theory of on-off gain of small signal, the raman gain coefficient for frequency shift between 0.5 and 20 thz of standard sigle mode optical fiber is measured by pump-probe method through a super luminescent diode ( sld ) as a broadband small signal probe source . thirdly, numerical simulation analysis of gain characteristic of raman fiber amplifier for c band wdm signal light is made according to the raman gain coefficient of the fiber measured before through target and four rank runge-kutta method . at the invariability of wavelength and maximum power of each of two pumps, schematic of powers of two pumps for best flatness on c band wdm optical gain was found out, at the same time, the factors of resulting in gain saturation is analyzed, too
  本文首先应用经典的电磁理论对拉曼光纤放大器的工作机制进行了分析，然后，根据小信号理论推导出的开关增益求出了光纤拉曼增益系数的表达式，采用泵浦-探测波的方法，利用超辐射激光二极管(superluminescentdiode简称sld)作为探测光源，测量了所用标准单模光纤频移为0.5-20thz的拉曼增益系数，之后根据所测得的光纤的拉曼增益系数谱对应用该类光纤构成的放大c波段wdm光信号的拉曼光纤放大器的增益特性采用打靶法和四阶龙格---库塔进行了数值计算，在给定了两个泵浦光源的波长和最大功率后，找出了反向泵浦情况下使c波段wdm光源增益最平坦的两个泵浦的各自最佳功率，同时也分析了导致信号光饱和的原因。
• Research on superconducting josephson array oscillator, a national nature science fund subject, investigates a high property thz oscillate source with wide potential applications in many areas, such as aerospace, universal detection and object recognition
  超导约瑟夫森结阵列振荡器是国家自然科学基金项目，这种振荡器是一种具有广阔应用前景的高性能thz振荡源。这种器件在航空航天、天文探测、地球卫星遥感、卫星地面目标识别以及医疗诊断上均有着极为广阔的前景。
• 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。