Abstract
We propose a simplified method to quickly determine the pulse-front of an ultra-intense laser, which usually possesses a very long beamline and hundreds of cascaded optical elements. By deriving the wave-front and pulse-front of a pulsed beam in paraxial optical systems, we show that, in some conditions, the pulse-front overlaps with the wave-front of a specific “wavelength” whose refractive-index equals the group refractive-index. In this case, by using the commercial ray-tracing software, the pulse-front of an ultra-intense laser can be quickly determined by calculating the wave-front of this “wavelength,” and the distorted spatiotemporal optical field can also be obtained approximately. We believe this method could significantly simplify the design of an ultra-intense laser.
© 2020 Optical Society of America
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