| 1. | Study on the nonlinear refractive index and the nonlinear absorption coefficient of thin films
薄膜材料的非线性折射率和非线性吸收系数研究 |
| 2. | Through connecting experiment results with theories the third - order nonlinear refractive index and nonlinear absorption coefficient are calculated
根据z -扫描实验曲线和理论公式，可以计算出非线性折射率和非线性吸收。 |
| 3. | The theoretical analysis show that the nonlinear absorption for the probe light in the coherent atoms increases rapidly from zero to the steady state through a transient process when signal light is switched on
计算表明在信号光开启后的瞬间，介质对探针光的非线性吸收从接近于零的状态迅速增加，经过一个短暂的瞬态过程到达稳态。 |
| 4. | We carried out closed - aperture and open - aperture z - scan experiments . but we did not obtain the open - aperture z - scan curve , which indicate that the samples " nonlinear absorption are extremely small , therefore the nonlinear absorption could be neglected
采用z -扫描法对样品进行了闭孔、开孔z -扫描实验，但未测出开孔z -扫描曲线，说明样品溶液的非线性吸收非常小，可以忽略不计。 |
| 5. | Measurements had been performed under a ps laser excitation at 1064nm and 532nm using the z - scan technique . the real part of x ( 3 ) showed positive nonlinearity for both measured wavelength . nonlinear absorption evidently existed that attributed to saturation absorption process
在1064lun和532run激光波长下，多孔硅的实部均为一个正值，样品存在明显的非线性吸收，这种吸收与饱和吸收相对应。 |
| 6. | The nonlinear absorption coefficient ( b ) , the nonlinear refractive coefficient ( n2 ) and the third - order nonlinear susceptibility ( x ( 3 ) ) of three monomers and some polymers were fitted and calculated . the relationship between nonlinear optical properties and molecular structures was discussed
对它们的非线性吸收和非线性折射进行拟合，计算得到非线性吸收系数、折射率n以及三阶非线性系数x ~ ( 3 ) ，并探讨了分子结构和材料性能之间的关系。 |
| 7. | According to m . sheik - bahae ' s theory the sample has a negative nonlinear refractive index under 1064 nm pulse laser . it was determined as 6 . 5 x 10 - 21 m2 / w . meanwhile , the minimum value of normalized transmittance of z - scan curves without aperture are found at the focus , and indicate that nickel one - nuclear complexes have nonlinear absorption properties
同时开孔z扫描曲线在焦点处出现透过率的最小值，表明它具有非线性吸收特性，其非线性折射率为6 . 5 、 10一， ， mz / w ;我们还利用归一化透过率曲线算得了这两种镍单核配合物的三阶非线性极化率的实部。 |
| 8. | Secondly , the third order nonlinear optical properties of these compounds are studied under the excitation of ps pulsed laser with the wavelength of 1064nm using z - scan technique , nonlinear refractive indices and nonlinear absorption coefficients are calculated according to the z - scan experiment curves of the compounds . all the three compounds have self defocusing characters and two photon absorptions . lastly , nonlinear refraction and absorption properties of these compounds are studied by z - scan technique under the excitation of ps pulsed laser with the wavelength of 532nm the self defocusing and reverse saturation absorption are found in these compounds
根据实验曲线计算了它们在1064nm下的三阶非线性折射率和非线性吸收系数，三种化合物都具有自聚焦特性，并且在该波长下，三种化合物均具有双光子吸收，最后，以皮秒脉冲的532nm为激发波长，采用z扫描方法，研究了三种金属有机化合物的非线性折射和非线性吸收性质，在该波长下三种化合物仍然表现为自聚焦特性，且其吸收为反饱和吸收。 |
| 9. | Their optical properties are characterized by z - can technique , uv - visible absorption spectrum and so on . the experimental results indicate that although large nonlinear refractive index is observed in two pbs / cds systems with different band gap , the sample of bigger band gap exhibit obvious nonlinear absorption in the range of nonresonance
另外，我们改变制备条件，得到了光学带隙不同的pbs cds纳米复合体系，并采用z -扫描技术研究了它们的非线性光学性质。两个样品都具有大的非线性折射率，但光学带隙大的样品在非共振区域表现出明显的非线性吸收。 |
