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Nondiffracting pulses are spatially and temporally localized wave fields that undergo no diffractive spreading under propagation through homogeneous media. We introduce an orthogonality condition for nondiffracting pulses and present an orthogonal set of X waves which possess temporal spectra of the form (polynomial in ω) × e −αω . The newly introduced Bessel-X pulses and X-wave transforms are discussed in the framework of the orthogonal X-wave bases.
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Salo et al. (2001) studied this question.
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