排序方式: 共有21条查询结果,搜索用时 15 毫秒
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A STUDY ON REAL-TIME LOW-FREQUENCY SPATIAL FILTERING PROCESS OF AN OPTICAL IMAGE USING LiNbO3:Fe CRYSTAL 下载免费PDF全文
The optimum image processing result of low-frequency filtering was obtained when LiNbO3:Fe crystal as a spatial filter was placed at a certain position behind the spatial-frequency spectral plane of an optical Fourier transform system, which corresponds to the minimum transmittance ratio in Z-scan curve. The experimental results show that self-defocusing due to photorefractive negative-lens effect is the main factor responsible for the low- frequency filtering. 相似文献
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非线性光纤光栅在禁带内对光脉冲压缩的机制 总被引:1,自引:0,他引:1
研究了非线性光纤光栅在禁带内对光脉冲的压缩机制,结果表明这是一介储能-调出禁带的过程,入射脉冲首先在光纤光栅中激发能量密度波包,它是有限长光纤光栅中的准孤立波,其在光纤光栅输出端的能量损失形成输出脉冲,并决定了输出脉冲的脉宽和峰值功率。在脉冲压缩过程中,自振荡效应可以导致输出脉冲的分裂,利用这种效应可以提高脉冲压缩比。 相似文献
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A STUDY ON REAL-TIME LOW-FREQUENCY SPATIAL FILTERING PROCESS OF AN OPTICAL IMAGE USING LiNbO3:Fe CRYSTAL 下载免费PDF全文
The optimum image processing result of low-frequency filtering was obtained when LiNbO3:Fe crystal as a spatial filter was placed at a certain position behind the spatial-frequency spectral plane of an optical Fourier transform system, which corresponds to the minimum transmittance ratio in Z-scan curve. The experimental results show that self-defocusing due to photorefractive negative-lens effect is the main factor responsible for the low- frequency filtering. 相似文献
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研究在连续光入射下掺饵光纤光栅的开关动力学特征,发展其开关过程有类似于相变的特征。数值结果表明,主动光纤光栅在连续光条件下更适合于脉冲串产生。 相似文献
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本文利用LiNbO_3:Fe晶体中的四波混频完成了矩阵-矢量和矩阵-矩阵乘法运算。代表矩阵元素的光点强度小于10OμW/mm~2,响应时间为秒的量级。文中还讨论了两个影响运算精度的光折变效应。 相似文献
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采用少体物理方法,计算了惰性元素三分子团簇Kr3的低激发能谱,分析量子力学对称性对Kr3的几何结构和内部运动影响,给出Kr3代激发能谱的几条与Ne3和Ar3低激发能谱中完全相似的转动带。发现量子数Q有可能近似地作为一个好量子数,来对惰性三分子团的低激发谱进行分类。 相似文献
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