共查询到19条相似文献,搜索用时 93 毫秒
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对于介质薄膜波导的一边或两边复盖有介电常数与光强成正比的非线性介质的三种不同结构,本文导出了三层非线性平面光波导TM波的精确色散关系。对称三层非线性平面光波导的数值计算实例与有限元法的结果完全一致。 相似文献
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非线性光学器件的主要应用目的之一是全光信号处理,非线性光波导象其它非线性光学器件一样,也已被广泛地应用于全光信号处理方面的研究,如人们已采用棱镜波导非线性分布耦合方式来实现全光限幅、全光开关和全光双稳等研究[1,2].在非线性光波导器件中,由于光被束缚在微米尺寸的光波导中传输,而大大增加了光功率密度,因此,在光与非线性光波导的相互作用过程中可以大幅度地降低非线性效应的阈值功率,提高全光信号处理的灵敏度.此外,非线性光波导器件的小型化、集成化等优点更吸引人们去进行深入的研究. 相似文献
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有机高聚物PPQ薄膜的反常群速色散 总被引:1,自引:1,他引:0
通过对PPQ薄膜的吸收光学谱的计算分析,由Kramers-Kronig关系得到PPQ膜在550nm~700nm左右波段存在负群速色散区,并且色散量对相对较小,│β2│〉1.2ps^2/m,这使得对飞秒激光脉冲在PPQ平面光波导中的传输的传输的描述可以忽略色散顶,根据这一间化,仅考虑自相位调制(SPM)效应,由于飞秒对撞锁激光脉冲的光谱展宽民计算的PPQ的非线性折射率系数n2,与报道的结果吻合很好。 相似文献
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从光折变效应的单中心模型和载流子的光伏迁移机理出发给出了高斯片光在LiNbO3:Fe晶 体中导致的折射率变化分布的解析表达式.利用片光以“三明治”辐照方式在LiNbO3:Fe晶 体中写入了平面光波导结构.用切片干涉法测量了波导区的折射率分布,并对波导进行了简 单的导光测试.根据射线方程以及波导的折射率分布对光写入波导的导光特性进行了模拟计 算分析.研究结果表明,在LiNbO3:Fe晶体中光写入光波导是可行的.
关键词:
LiNbO3:Fe晶体
光辐照法
平面光波导
导光特性
高斯片光 相似文献
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发展了一种以有限元法为基础的数值方法,用它分析由损耗任意大小材料构成的平面非线性波导结构所传导的非线性有损耗光波。在这种方法中,从给出的非线性有损耗波导直接得到TE和TM波与功率有关的复传播常数和局域电磁场分布。 相似文献
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用转移矩阵法数值分析了芯区和衬底为非线性介质、覆盖层为线性介质结构平面光波导的传播特性,包括TM的模场分布和功率与有效折射率之间关系的分析.解析地表达了模式本征方程和功率分布,对非线性介质中电场强度与介质非线性系数的关系进行了研究.计算结果表明,TM的模场分布和功率与有效折射率及介质的非线性系数有关. 相似文献
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1IntroductionNonlineardistributedcouplingthroughprismtononlinearplanarwaveguidehasbeninvestigatedandthecharactersofopticalli... 相似文献
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Spatial solitons are studied in a planar waveguide filled with nonlinear liquids. Spectral and spatial measurements for different
geometries and input power of the laser beam show the influence of different nonlinear effects as stimulated scatterings on
the soliton propagation and in particular on the beam polarization. The stimulated scattering can be used advantageously to
couple the two polarization components. This effect can lead to multiple applications in optical switching. 相似文献
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We report the formation of a planar waveguide in an Nd:YGG laser crystal by low-energy He-ion implantation at liquid nitrogen temperature (77 K). The optical properties are measured by the prism coupling and end-face coupling methods, the absorption properties the waveguide and Nd:YGG substrate are obtained. The fluorescence spectrums are investigated by confocal methods. The experimental results revealed that the planar waveguide preserved the absorption and fluorescence properties of the Nd:YGG laser crystal. Thus, the planar waveguide formed by the ion implantation method is a promising candidate in waveguide lasers. 相似文献
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M. Jelínek J. Lančok J. Šonský J. Oswald M. Šimečková L. Jastrabík V. Studnička C. Grivas P. Hříbek 《Czechoslovak Journal of Physics》1998,48(5):577-597
The parameters of planar and channel waveguide lasers fabricated by different techniques are reviewed. Materials and properties
of thin films used for creation of planar waveguide lasers are summarized. The parameters of active and passive planar waveguides
created by the method of pulsed laser deposition and problems of laser deposition are described. The aspects of laser generation
of planar waveguide lasers, resonators and channel waveguides are presented. The results of our experiments of laser deposition
of thin Ti:sapphire layers and thin layers of Nd:YAG and Nd:YAP are briefly discussed.
This work was supported by the grant of Czech Grant Agency No. 102/96/0429. 相似文献
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采用飞秒激光脉冲研究聚苯基喹恶啉共轭有机高聚物薄膜中由法布里-珀罗效应产生的光谱的干涉条纹结构,并通过改变脉冲的峰值功率,测到的光谱条纹结构的变化,说明是依赖光强的非线性折射率的变化引起了干涉条纹的改变,通过平均功率不变只改变脉冲峰值功率方法,验证了热效应在干涉条纹的变化中不起主导作用。 相似文献
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We investigate the possibility of optical pulse compression of high energy ultrashort laser pulses in an argon-filled planar waveguide, based on two level coupled mode theory and the full 3D nonlinear Schr?dinger equation. We derive general expressions for controlling the spatial beam profile and the extent of the spectral broadening. The analysis and simulations suggest that the proposed method should be appropriate for optical pulse compression of ultrashort laser pulses with energies as high as 600 mJ. 相似文献