波长范围

• ( 2 ) the emission spectra of laser ablation metal copper plasma were measured . the detailed mechanism of plume emission of cu plasma was qualitatively explained using a simple model based on excitation of atom and ion in plume arising from inelastic collision between the elemental species and electron with high kinetic energy . under the local thermal equilibrium model , the electronic temperature of copper plasma was deduced to be in the 104 scale by its emission lines
  ( 2 ) cu等离子体光谱：在420 570nm波长范围内观测了激光烧蚀cu等离子体的光谱和各发射谱线在等离子体中的空间分布；比较了激光能量对cu等离子体发射光谱、电子温度的影响；用局部热力学平衡( lte )近似，测得cu等离子体的电子温度为104k数量级；在不同背景气压下，观测了激光烧蚀cu等离子体光谱的空间分布。
• Continuous - wave optical parametric oscillators ( cw opos ) are an attractive source of coherent radiation in applications for which laser sources are unavailable or for which wide tunablity is needed , cw opos have remarkable features of operating with narrow linewidth and broad tunablity
  连续波光学参量振荡器( cwopos )可以用来拓宽激光的波长范围，有较宽的调谐区域，是一种理想的产生相干辐射的装置。由于它的窄线宽和宽调谐的输出特性，也被用于光谱学、相干光通讯、量子光学等领域。
• In wavelength division multiplexing ( wdm ) optical communication networks , power equalization and adjustment between channels demand variable optical attenuator ( voa ) be capable of providing low power consumption , low insertion loss , polarization independence , integration compatibility and flatness in a wide wavelength range . among the presented voas , thermo - optic type owns superior polarization dependence upon electro - optic one , and thermo - optic voa can be driven with much lower power than micro - electro - mechanic system ( mems )
  在波分复用( wdm )光通信网络中，多信道间的功率均衡和调整需要具有良好特性的光可变衰减器( voa ) ，这些特性包括：低功耗、低插入损耗、偏振无关、易于集成以及大波长范围内的通带平坦性。
• Because of the anatase ' s broad eg ( 3 . 2ev ) , the absorption thresholds correspond to 380nm for the tio2 . consequently , only the ultraviolet fraction of the solar irradiation can be active in the photoexcitation processes using pure tio2 solid . the high recombination rate of charge carrier and low efficiency of quantization are also the deficiencies of pure tio2
  由于tio _ 2的带隙较宽(约3 . 2ev ) ，半导体的光吸收波长范围窄(主要在紫外区) ，故其太阳能的利用效率低，且还存在半导体载流子的复合率高，量子化效率低等缺陷。
• Measurement and characterization of surface texture is an important aspect of precision metrology . historically this has involved partitioning a profile into different wavelength regimes referred to as roughness , waviness and form followed by numerical quantization . parameters computed are then inspected for tolerance compliance to ensure a part performs its intended function . this approach is satisfactory when the specification has been carefully determined and the process is stable . however , when the manufacturing process is under development or when instability or modifications to the process invalidate specifications , there is a need to study surface finish parameters in relation to functional performance or process measures . in this context , the problem of surface texture classification and recognition are discussed . advanced techniques developed for this purpose along with applications are presented . also , the techniques discussed here will be useful across large bandwidth , from the characterization of nano scale to traditional micro scale surfaces
  表面结构的测量与特征描述是精密计量技术的一个重要方面,传统上包括将轮廓情况根据不同的波长范围划分为粗糙度、波纹度和形状及后续的数字量化.按算得的参数检查它是否为公差允许,以保证零件执行其指定的功能.当技术特性已经经过仔细确定,并且其过程稳定时,该方法是令人满意的;但是,当制造过程正在进行中或过程的不稳定、过程变化使技术特性失效时,就需要研究和功能表现及过程评定相关的表面参数.讨论了表面结构的分类与识别问题.同时阐述了为此目的而开发的先进技术及其应用.所研究的技术对从纳米尺度到传统的微米尺度的较大带宽范围内的表面特征描述都是有效的
• The composites not only show excellent photo - responsive properties in the visible and near - ir region ( 450 ~ 850 nm ) , but also show complementary and synergetic enhancement effects in photosensitivity in the visible and near - ir region . the reasons for the enhanced photoconductive properties and new effects are explained in terms of the partial and directional charge transfer from phthalocyanine to azo compound in these azo / tiopc composites . 2
  研究发现这两种复合材料体系在可见光区和近红外光区( 450 850nm )均有光谱响应，光谱响应范围得到了拓宽，并在该波长范围内都有优良的光电导性能，呈现出明显的光电导性能协同增强和互补效应，该复合材料体系中酞菁向偶氮发生的部分定向的电荷转移是光电导性能协同增强和互补效应产生的物理起因。
• On the other hand the crosstalk of the wdm signal at fan - out of demultiplexer will increase with the power difference of the each channel . therefore , the gain of optical amplifier to wdm signal must have small ripple . one of the solutions is using two or more pumps with different wavelength and power according to the range of signal light to be amplified and raman gain coefficient of the fiber
  另外，各路信号光之间较大的功率差异会增加wdm信道解复用器输出端的串话，所以光放大器对wdm各路信号光的增益要满足一定的增益平坦度，解决该问题可以根据所要放大的wdm信号光的波长范围和所用光纤的拉曼增益系数谱，采用多个不同波长和功率的泵浦光源进行泵浦。
• In the study , sd2000 spectrometer is applied to obtain radiation spectrum of flame within wavelength 480 - lloonm , from which flame temperature and monochromatic emissivity are derived by newton raphson non - linear method and levenberg - marquart modeling method . the flame monochromatic emissivity is translated in form of f ( / l ) and a ( a ) respectively
  在该方法中，采用sd2000型光纤光谱仪测量火焰在可见光( 480 - 1100nm )波长范围内的火焰的辐射光谱，结合newton - raphson非线性迭代算法和levenberg - marquardt最优化算法，得到火焰温度和单色辐射率变化规律。