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本文首先介绍当前多媒体软、硬件技术发展情况,然后论述计算机多媒体教室的配置,最后用基于WINDOWS图形界面的软件直观地演示模拟物理实验,说明计算机多媒体在教学上应用前景广阔。 相似文献
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Ultraslow optical solitons via electromagnetically induced transparency: a density-matrix approach 下载免费PDF全文
We study the ultraslow optical solitons in a resonant
three-level atomic system via electromagnetically induced
transparency under a density-matrix (DM) approach. The results of
linear and nonlinear optical properties are compared with those
obtained by using an amplitude variable (AV) approach. It is found
that the results for both approaches are the same in the linear
regime if the corresponding relations between the
population-coherence decay rates in the DM approach and the
energy-level decay rates in the AV approach are appropriately
imposed. However, in the nonlinear regime there is a small
difference for the self-phase modulation coefficient of the
nonlinear Schr\"{o}dinger equation that governs the time evolution
of probe pulse envelope. All analytical predicts are checked by
numerical simulations. 相似文献
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