Design and fabrication of an all-dielectric grating with top-hat high diffraction efficiency over a broad spectral range

N. Lyndin; M. Flury; S. Tonchev; R. Fechner; O. Parriaux

doi:10.2971/jeos.2007.07019

Journal of the European Optical Society - Rapid publications, Vol 2 (2007)

Design and fabrication of an all-dielectric grating with top-hat high diffraction efficiency over a broad spectral range

N. Lyndin, M. Flury, S. Tonchev, R. Fechner, O. Parriaux

Abstract

Between 98% and 100% flat top efficiency –1st order TE diffraction over a 40 nm wavelength range centered at 800 nm can be obtained by an all-dielectric grating structure where the corrugation is etched in a high index layer unlike in the state of the art. 98% maximum efficiency and a wide-band top-hat diffraction efficiency spectrum are demonstrated experimentally opening to high efficiency femtosecond pulse compression for high average power laser machining.

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