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Analytical solutions for the electromagnetic fields of tightly focused laser beams of arbitrary pulse length

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Abstract

The analytical solution for a monochromatic focused laser beam was recently published [Opt. Lett. 31, 1447 (2006) ]. The effect of introducing bandwidth by including a finite-length temporal pulse envelope is included exactly. This is done formally first in the frequency domain for an arbitrary pulse shape, and the specific case of a cosine-squared envelope is then solved analytically for all pulse lengths, thereby decreasing the computation time by 2 orders of magnitude. The inclusion of longer wavelengths reduces the fraction of laser energy in the focus from 86.5% to 83.5% for a 5fs Ti:sapphire laser and 72.7% in a single-cycle pulse.

© 2006 Optical Society of America

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