共查询到18条相似文献,搜索用时 109 毫秒
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本文研究了全息存储实验中以波长532 nm的半导体激光器作为记录和读出光源,碱性品红作为光敏剂的丙烯酰胺基光致聚合物薄膜的光致光衍射现 象.它可以考虑为透过全息干涉条纹的原始入射光和反射光,与来自光聚物中未曝光的不均匀表面和内部的散射光四波混频的结果.根据简并四波混频理论中的位相匹配条件对双光束全息写入时产生的衍射光锥,以及单光束辐照复现时产生的衍射光锥现象分别做出了理论解释;并且利用全息散射理论结合三角学知识对入射光的入射角与衍射光锥的锥角的依赖关系进行了深入讨论.
关键词:
全息
光致聚合物
衍射光锥
碱性品红 相似文献
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利用掺杂KNSBN晶体,报道了两束异常偏振光所引起的各向异性锥形衍射现象。首次观察到一种由三个衍射光锥所组成的各向异性衍射图样,并且提出了由入射光和满足相位匹配条件的前向散射光所参与的光折变四波混频机制。对双光束对称入射这种特殊实验配置情形,给出了衍射光锥的锥角随入射角的变化关系式,理论分析和实验结果符合得很好。 相似文献
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光学外差法测量Ba原子的自电离态 总被引:1,自引:1,他引:0
提出了把三光子共振非简并六波混频(NSWM)和双光子共振非简并四波混频(NFWM)应用于研究Ba原子自电离态的光学外差探测方法。采用该方法测量了Ba原子的6P3/219d自电离态,并观察到了三光子共振 NSWM和双光子共振NFWM信号干涉引起的信号增强。该方法是一种纯非线性光学方法,具有优秀的空间分辨率和简单的光路。其中双光子共振非简并四波混频信号作为本地振荡光束,三光子共振非简并六波混频信号作为信号光束,通过 改变信号光束的频率来达到用光学外差探测法研究Ba原子自电离态的目的。该方法中,实现相位匹配所要求的条件不是很严格,可以在很宽的频率范围内实现相位匹配,而一般的六波混频很难做到相位匹配, 并且所测量的信号是相干光, 当用窄带宽的激光时,可以获得消多普勒的分辨率。 相似文献
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所谓简并四波混频[1-3],是指频率相同的二束共线而相反方向传播的激光(第1,2光束)与另一束方向任意而频率相同的探测光(第3束),在具有三级极化率的介质中混频,从而产生频率相同的信号波(第4光束)。它与探测波共线而传播方向相反和相位互为共轭.如图1所示.简并四波混频在实时信息处理和象差补偿等的潜在的实用价值,使许多研究工作者在固体、液晶、金属蒸气和染料等各类介质中进行了广泛的研究[1-8]。 最近,Steel,Lam[9]和作者[10]首先计算了在等离子体中简并和二重简并四波混频的三级非线性极化率,并指出从红外至微波整个波段,等离子体是简… 相似文献
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B. Visser M. Beck P. Bornhauser G. Knopp T. Gerber R. Abela J. A. van Bokhoven P. P. Radi 《Journal of Raman spectroscopy : JRS》2016,47(4):425-431
The potential of two‐color resonant and degenerate four‐wave mixing spectroscopy for investigations of the complex spectra of transition metal dimers is explored. Two‐color resonant and degenerate four‐wave mixing spectroscopy scans of the well‐known A‐X and B‐X transitions in Cu2 are reported and compared with previous experimental data obtained from standard single‐resonance techniques. The selectivity of the method is shown to enable the measurement of isotopologue pure spectra without the need for isotopically enriched metal targets. Specific subsets of the rovibronic structure are separated in a congested spectral region of overlapping transitions. The sensitivity of the method compares satisfactorily with linear spectroscopic methods such as laser‐induced fluorescence and cavity ring‐down. A new laser vaporization source for the production of transition metal dimers and clusters has been constructed. The new design aims for a high number density and maximum possible shot‐to‐shot stability. The possibilities of further applications of non‐linear four‐wave mixing spectroscopy to Cu2 and other transition metal dimers are discussed. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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Phase conjugation of singular (vortex) beams is performed using a static nonlinearly recorded hologram. The diagnostics of phase-conjugate optical vortices is carried out by an original method based on the Young model of diffraction phenomena. It is shown that a phase-conjugate vortex is characterized by the same topological charge as a vortex inverted by degenerate four wave mixing, differing in sign from a vortex reflected by an ordinary mirror. 相似文献
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In this communication, we report the generation of a picosecond forward-traveling phase-conjugate wave at 1.06 μm in thin germanium samples by degenerate four-wave mixing. At this wavelength, the conjugate wave is produced by diffraction of the pump from an absorption grating produced by direct absorption of pump and signal pulses. We measure and discuss the transient effects caused by the finite duration of the nonlinear material response. 相似文献
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用三维简并四波混频的实验装置,在偶氮化合物中观察到了多波混频效应,在接收屏上,除了三个泵浦光斑,还观察到了由于多波耦合产生的另外14个排列整齐的信号光斑,这个现象可望被广泛用光计算,信息处理和光互连中。 相似文献
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双KTP内腔参量下转换产生量子相关孪生光子对 总被引:5,自引:2,他引:3
使用双KTP晶体串接,经光学参量振荡腔内参量下转换,在300mW泵浦功率下,获得总功率约23mW的强度相关的孪生光束,在1.25MHz处其强度差噪声功率较散离噪声极限降低50%(3dB)。 相似文献
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We characterize size-dependent carrier relaxation dynamics of partial laser structures containing quantum dashes by time-resolved degenerate four wave mixing between 1.2 and 1.6 μm. 相似文献