共查询到20条相似文献,搜索用时 677 毫秒
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单模光纤相位光栅外腔主动锁模半导体激光器 总被引:2,自引:2,他引:0
报道用单模光纤光折变相位光栅作外腔的主动锁模半导体产激光器,产生1.53μm,1.065GHz,15ps的近变换限超短光脉冲。 相似文献
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提出了一种采用Damman光栅和球面透镜组合光学系统产生二维光阱阵列的新方案. 在使用红失谐高斯激光束照射的条件下,推导了计算光阱阵列的周期、光强分布、光强梯度和光阱几何参数的经验公式,讨论了此光阱阵列的特点以及在原子光学和分子光学中的应用. 研究结果表明,这种光阱阵列方案比已有的光阱阵列方案更为简单可行、操作方便,非常适用于冷原子或冷分子的阵列囚禁,以及制备新颖的光学晶格.
关键词:
冷原子或冷分子
光阱阵列
Damman光栅
光偶极势 相似文献
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用简易易行的方法对液晶光阀(LCLV)的工作特性曲线作了测量,包括光阀在正像,反转像和微分像状态读出光强与写入光强的响应曲线,以及不同写入光照度下液晶层透过率与工作电压的关系曲线,对所得结果的分析揭示了这方面以及未曾深入研究的液晶光阀非线性转换的特性,由此为光阀的很多新用途提供了坚实的实验基础,指出了进一步探索的方向。 相似文献
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CrostalkNoiseSuppresioninVolumeHolographywithaCompositeReadingBeamLIXiaochunWUMinxianHEQingshengJINGuofan(DepartmentofPreci... 相似文献
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Yoshihisa Takayama Atsushi Okamoto Kunihiro Sato Kazuhumi Kumagai Yugo Aizawa 《Optical Review》1998,5(1):49-53
We consider the optimum incident angles of cross polarized four-wave mixing with a photorefractive crystal. First, the phase matching angles are obtained for two operation modes: one in which the writing beams are ordinary rays and the reading beam is an extraordinary ray, we call this Mode 1. The other in which the writing beams are extraordinary rays and the reading beam is an ordinary ray, Mode 2. Next, practicable ranges of the incident angles are calculated considering of the total internal reflection of the phase conjugate beam in cases where the two writing beams illuminate the same surface of the BaTiO3 crystal and where they illuminate the neighboring right-angled surfaces, respectively. Then, the coupling coefficient is determined as a function of the incident angle, and the optimum incident angles for effective beam interaction in Mode 1 and Mode 2 are estimated. 相似文献
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A theoretical model for formation of light-induced gratings in organic photoisomers is presented. Using this model, dynamic behaviors of the light-induced gratings are studied theoretically for two different cases: in the first case, in addition to a CW loser generating the writing beams and the reading beam, a pulsed laser is used as an optical pump, in the second case, the writing beams are provided by a pulsed laser, and the reading beam comes from a CW laser. Agreement between experiment and theory is also demonstrated. 相似文献
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In weak doped photorefractive LiNbO3 crystal, the diffraction efficiency is highly relevant to the writing and reading beam polarizations. In this paper, based on dynamic coupled-wave equations, we theoretically discuss the diffraction efficiency under four writing and reading polarization conditions, then reach the proven conclusion that with o-polarized beams to write and with e-polarized beam to readout, the diffraction is the largest. 相似文献
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In weak doped photorefractive LiNbO3 crystal, the diffraction efficiency is highly relevant to the writing and reading beam polarizations. In this paper, based on dynamic coupled-wave equations, we theoretically discuss the diffraction efficiency under four writing and reading polarization conditions, then reach the proven conclusion that with o-polarized beams to write and with e-polarized beam to readout, the diffraction is the largest. 相似文献
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1 Introduction Inphotorefractivecrystal,manyapplications,suchasimageamplificationandimagestorage ,needtousethepropertyofhighdiffractionefficiency .Someauthors[1] havereferredthathighdiffractionefficiencyinphotorefractiveLiNbO3crystalcanbeobtainedbywriting… 相似文献
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We have studied the effect of the reading beam on the decay process of the photoinduced second-order susceptibility χ(2) in both the guest-host system (disperse red 1-doped polymethyl methactrylate) and the side-chain system (disperse red 19-functionalized
polyimide polymer). Both experimentally and theoretically, we have proved that the reading beam has the erasure effect on
the decay process, that is, χ(2) decays faster in the high intensity than in the low intensity of the reading beam. Furthermore, the relationship between
the time constant τB of the slow component of the decay process and the intensity of the reading beam I1.06 is derived from the theoretical equations, which is fitted well with the experimental results. Based on the fitting parameters,
we also compare, quantitatively, the thermal-induced orientational diffusion of trans- and the quantum efficiency of trans-to-cis
photoisomerization in the two systems.
Received: 8 September 1999 / Revised version: 14 March 2000 / Published online: 16 August 2000 相似文献
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A theoretical model of light diffraction by tilted holographic gratings in photopolymeric materials in the nonstationary regime of reading, which describes the dynamic process of optical hologram amplification with allowance for the photopolymerization and diffusion mechanisms of recording, is developed. For the given model, the dynamics of the diffraction efficiency and selective properties of hologram reading are modeled numerically when Bragg's conditions are satisfied and violated. It is demonstrated that the diffraction characteristics of tilted holograms are spatially noninvariant for the reading beam direction. The optimal conditions of reading of tilted holograms are established. 相似文献
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Xiuqin Yang Chunping Zhang Shengwen Qi Kuan Chen Jianguo Tian Guangyin Zhang 《Optik》2005,116(6):251-254
Methyl orange is an excellent nonlinear optical material. Both ordinary intense modulation holograph and the polarization holograph can be recorded in the methyl orange-polyvinyl alcohol (MO-PVA) film. The polarization state relationship among two writing beams, reading beam, and diffraction beam can be used for construction all-optical Boolean logic gate. 相似文献