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Recently the beam focusing in reflection from chirped dielectric mirror has been proposed and demonstrated, where the negative (anomalous) diffraction is responsible for this flat mirror focusing. For a strong focusing performance (large focal distance), a wide angular range of strong (negative) angular dispersion is required. We show that a defect layer in the dielectric mirror (one layer is of a double size), can increase the angular dispersion, and thus improve the focusing performance. By introducing a defect layer in the chirped mirror, the focal distances can be increase from 12 µm up to 22 µm in a specific, calculated, structure, as our numerical integration show.
CitationCheng, Y.; Staliunas, K. Beam focusing in chirped mirror with a defect. A: International Conference on Transparent Optical Networks. "Proceedings of 2004 6th International Conference on Transparent Optical Networks". Varsovia: IEEE Press ; Wiley, 2004, p. 6876687-1-6876687-3.
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