Optical image addition and subtraction based on electromagnetically induced transparency effect

The electromagnetically induced transparency (EIT) effect is a quantum coherence between different atomic transition channels. absorption of the ensemble significantly reduced or even close to zero, and at same time, this accompanied by strong spectral dispersion near resonant frequency atoms, which widely used in group velocity control, light pulse storage, coherent manipulation on field. In storage based EIT effect, retrieval field determined signal, coupling, readout fields, enabling be dynamically controlled manipulating spatial components interacting fields. paper, according we achieve experimentally optical image addition subtraction imaging plane 4<inline-formula><tex-math id="M2">\begin{document}$f$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="9-20221560_M2.jpg"/><graphic xlink:href="9-20221560_M2.png"/></alternatives></inline-formula> system through via Specifically, first store spectrum double-slit mask praseodymium-doped yttrium silicate crystal located confocal id="M3">\begin{document}$f$\end{document}</tex-math><alternatives><graphic xlink:href="9-20221560_M3.jpg"/><graphic xlink:href="9-20221560_M3.png"/></alternatives></inline-formula> effect. Then, utilize specially designed containing target objects perform filtering using stored pulse. By moving mask, images can achieved id="M4">\begin{document}$f$\end{document}</tex-math><alternatives><graphic xlink:href="9-20221560_M4.jpg"/><graphic xlink:href="9-20221560_M4.png"/></alternatives></inline-formula> system. We present theoretical model describe EIT-based technique. experimental results accord well with prediction. Compared traditional scheme cosine grating spectrum, our method does not require preparation filter, only produces first-order positive negative diffraction without influence zeroth-order image. provide new approach processing. This limited subtraction, it extended more complex operations such as differentiation, enhancement, encryption, decryption rational design. Therefore, areas fields dynamic