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The dynamic focusing characteristics of linearly polarized ultrashort pulses are studied. Both the complex source-sink model (CSSM) and the Richards-Wolf diffraction integral theory (RWT) are used to study the focusing phenomena. For the central focus spot, the descriptions of both the CSSM and the RWT are well consistent. Also, the CSSM can describe the super-resolution focused spot very conveniently, and only the beam waist parameters need to be changed. The dynamic convergence and divergence focusing phenomena of linearly polarized ul
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