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Spectral shifts and spectral switches in diffraction of ultrashort pulsed beams passing through a circular aperture

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Based on the Fourier transform method, a simple closed-form expression for the on-axis power spectrum of ultrashort Gaussian pulsed beams in diffraction at a circular aperture is derived, which permits us to study spectral changes both analytically and numerically. It is shown that for diffracted pulsed beams there exist spectral red and blue shifts, spectral narrowing, and spectral switches in the near field. The aperture diffraction plays an important role in spectral switching, but both the truncation parameter and bandwidth (or equally, Fourier transform limited pulse duration) affect the behavior of spectral switches.
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Document Type: Research Article

Affiliations: Institute of Laser Physics and Chemistry, Sichuan University, Chengdu 610064, China

Publication date: 01 December 2004

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