We obtain a optical imageamplification with high gain factor of 1583 in doped lithium niobate crystals.
并在掺杂铌酸锂晶体中获得了高信噪比，信号光增益高达1583倍的光像放大。
2
Conventional amplification technique is based on Ngquist sampling theorem; both there are some defects which reduces the quality of the image in the image processing.
传统的放大技术以采样定理为基础的，在对图像处理中都存在一定的缺陷从而降低了图像的质量。
3
In chapter 3, the noiseless amplification of optical images in the parametric image amplifier is discussed.