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Time-domain analysis of multilayer mirrors for ultrafast optics

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Abstract

Dispersive optical interference coatings (chirped mirrors-CMs) are designed by computer optimization of an analytically calculated initial multilayer. Traditionally, the relevant properties of the CM (reflectance and the frequency-dependence of the phase shift upon reflection) are optimized to match frequency-domain targets. This approach has enabled the design of CMs with bandwidths of up to 160 THz at 800 nm. Larger bandwidths (up to one optical octave) could be demonstrated for dispersive mirrors having glass as medium of incidence. The manufacturing of these mirrors is very involved and the range of applications in which they can be employed is limited as compared to standard CMs. We propose a novel target function that quantifies the capability of a multilayer to control the temporal shape of the reflected optical pulse. Employing this time-domain analysis/optimization one can design dispersive multilayers having air as medium of incidence and supporting the generation of pulses with durations in the 4-fs-range.

© 2004 Optical Society of America

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