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Amplification of vortex beam in flash-lamp-pumped Nd:YAG amplifiers has been demonstrated. A maximum output pulse energy up to 995mJ has been achieved at 10 Hz in a 10 ns pulse, corresponding to an amplification efficiency of 295%. Second-harmonic generation of the amplified vortex output was performed using nonlinear a KD.P crystal. Maximum second-harmonic energy of 470mJ was generated. The joule...
With the rapid development of modern technologies, information security has attracted more and more current attention. In this paper, we present optical image encryption based on 3-D sphere and phase retrieval in gyrator transform domain. The plaintext is divided into a series of small quadratic blocks, and each block is treated as a particle. The series of particles is distributed in 3-D spheres,...
A microwave imaging approach based on the integration of a subspace-base optimization method (SOM) and a multi-focusing procedure is proposed. The scattering equations are expressed within the contrast source formulation of the electromagnetic inverse problem and then solved by a nested procedure which includes an outer multi-resolution loop (dealing with the identification of the regions of interest),...
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