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The basic parameters of these materials (such as the refractive index, optical absorption coefficient, density, thermal conductivity, and heat capacity) are determined.
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Optoacoustic effect in dense layers of oriented carbon nanotubes: Its use for measuring the optical absorption coefficient and t
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It is shown that annealing and electron irradiation significantly decrease the optical absorption coefficient in the impurity absorption region.
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The optical absorption coefficient in the region of a wide charge-transfer band in copper oxide CuO (?ω=3.19 eV) exhibits sharp and anomalously large (up to 8% (!)) changes near two magnetic phase transition temperatures
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Data on acoustic (absorption and velocity of sound), optical (refractive index and optical absorption coefficient), and photoelastic (coefficients of acoustooptical quality and photoelastic constants) properties of KY(MoO4)2 crystals are obtained.
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A theory is proposed which allows one to describe the half-width of the luminescence curve for isolated quantum wells and investigate the frequency and temperature dependence of the light absorption coefficient in the long-wavelength region.
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An expression is obtained for the light absorption coefficient under conditions where the polarization interaction of an electron and a hole with the surface of the microcrystal plays a large role.
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The temperature distributions are numerically simulated and examined for long and short pulses, as well as for different values of the light absorption coefficient and the surface thermal conductivity of the frontal surface.
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In such a geometry direct optical transitions between the quantum-well levels are possible, the peak light absorption coefficient reaches large values (～3×102 cm-1), and the frequency of the absorption maximum depends on magnetic field strength.
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The obtained frequency dependence of the light absorption coefficient and the full widths at half maximum (FWHMs) of the absorption lines are compared with experimental data.
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Study on the improved structure of dye-sensitized solar cells for enhancing light absorption
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To solve this problem, an improved structure of DSSC for enhancing light absorption is introduced in this paper, and I-V characteristics of DSSC are measured to illustrate the enhancement of the light absorption and efficiency.
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As a result, the improved DSSC exhibits higher light absorption and solar-to-electric conversion efficiency than traditional DSSC.
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Light Absorption by the Clusters of Colloidal Gold and Silver Particles Formed During Slow and Fast Aggregation
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A method is proposed for estimating the volume fraction of microdroplets from the measurements of light absorption on one wavelength of the IR region.
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The specific light absorption coefficients of concentrations of iodine (100 to 2,000 mgs.
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Relation between the spectral values of the light absorption coefficients of sea water, phytoplanktonic pigments, and the yellow substance.
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| | The problems in fabricating integrated a-Si solar cells with acousto-opticQ-switched Nd:YAG laser scriber are described.During ITO layer scribing,the power density threshold of laser beams fora given thickness of ITO layer should be considered.If the power density oflaser beams used is higher than the threshold value,grooves with smooth edges,no residuum and their isolation resistance higher than 100 kΩ can be obtained.The crystallization of the material in the area near edges has been examinedby X-ray diff... | | 本文叙述用声光调 Q Nd:YAG 激光制造集成型 a-Si 太阳电池中的问题。在刻蚀 ITO 时,要注意掌握对应于 ITO 薄膜厚度的激光功率密度的阀值。用大于该阀值的激光功率进行刻蚀,可得到边缘平整,其中无淤积物,隔离电阻大于100kΩ 的刻槽。用 X 射线衍射和激光 Raman 谱确定了刻蚀区及其周围的晶化,二次谐波、波长为0.53μm 的激光束对 a-Si、a-SiC 的刻蚀是很有利的,因这些材料对波长0.53μm 的光的吸收系数较大,但必须提高倍频器的效率才能获得有足够功率密度的激光束。为减少集成型 a-Si 太阳电池的串联电阻,应选择适当的激光与样品的相对移动速率。对于金属背电极的选择刻蚀,为不损伤其下的 ITO 层,除控制激光功率密度外,选择短焦深的透镜并仔细调焦亦十分重要。 | | 文摘来源 | | We present a“Loss Balance”criterion to estimate the proper gain medium length (GML)of the Ti:sapphire pulse laser.In the one-longitudinally-pumped Ti:sapphire laser,when the conditions of the cavity are in certain,and in high pump level,the criterion can be written as follows :exp (-α_pl)=1-exp(-α_pl/β).Where α_p is the absorption coefficient to the pump beam,α_p/β=α_s is the absorption coefficient to the lasing beam,β is the figure of merit of the crystal,l is the GML of the crystal.When dual-longitudinal... | | 脉冲激光束纵向泵浦Ｔｉ￣（３＋）：Ａｌ＿２Ｏ＿３晶体，根据晶体中增益区的分布情况和脉冲运转的特点，从获取高转换效率考虑，可用“损耗平衡”确定晶体长度。单纵向泵浦时晶体的长度１由式选取。式中α＿ｐ是晶体对泵浦光的吸收系数，β是ＦＯＭ值。双纵向泵浦时，“损耗平衡”表示为：是晶体长度。根据实际光路的调整状态，设双纵向泵浦参数基本对称，对高α＿ｐ晶体取Ｌ＝１．５ｌ。若α＿ｐ较低，且泵浦参数并不对称，则Ｌ在ｌ＜Ｌ＜１．５ｌ范围内取值。这一方法与实验系统运转情况相符。 | | 文摘来源 | | Using the changes of light absorption coefficient for measuring the ratio of haemoglobin (Hb) and oxyhaemoglobin (HbO2),the oxygen saturation can be calculated and has got successful applications. According to the spectroscopic characteristics of haemoglobin and oxyhaemoglobin,this paper present a new system for monitoring the arterial oxygen saturation. | | 应用光的吸收系数的变化测量血红蛋白（Hb）和含氧血红蛋血（HbO2）之比计算出血氧饱和度。根据血红蛋白和含氧血红蛋白的光谱特性，提出了一种监测动脉血氧饱和度的新系统。 | | 文摘来源 | | | | << 更多相关文摘 |
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光吸收系数
optical absorption coefficient
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