| ABSTRACT:In this paper, optical parametric image amplification have been described, the conventional phase matching technology is widely used, but there is the problem that it can not use the maximum effective nonlinear coefficient of the nonlinear crystal and the presence of beam walk-off effect. So we raise that use optical parametric amplification base on the quasi-phase matching technology to achieve the faint image enhancement. We explore the optical parametric faint image enhancement system from the theoretical and experimental aspects, and the innovative achievements are as follows:1. The theoretical SNR of the optical parametric amplification system has been studied, and it is compared with the practical APD detection system, we point out the factors that affect the system SNR, and provide reference for the design of optical parametric amplification system.2. Taking into account the spatial distribution of the faint image when it is enhanced, comparing the peak signal to noise ratio and signal to noise ratio of the image under different circumstances, estimate the both as the evaluation criterion of the optical parametric image enhancement system. As it can be seen that the imaging quality effected by parametric fluorescence, and guide the design of optical parametric faint image enhancement system.3. Correlated imaging combine with the optical parametric amplification makes the correlated imaging have the superiority that signal enhancement, high sensitivity, frequency conversion, and the range gating can provide lateral and longitudinal images at the same time distance information of the target object, it has been applied for national patents.4. According to gain transfer function can be learned in different phase mismatch amount, the gain at different spatial frequencies is different. Proposed the use of optical parametric amplification strengthen the image in different phase mismatch amount, then the enhanced are fused to obtain high quality images. |
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