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Birefringent Fresnel zone plates in silica fabricated by femtosecond laser machining

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Abstract

We demonstrate maskless, single-step fabrication of strongly birefringent Fresnel zone plates by focusing of femtosecond laser pulses deep within silica substrates. The process allows us to produce alternate zone rings directly by inducing a local refractive-index modification of the order of n10-2. The embedded zone plates shown in this Letter exhibit efficiencies that vary by as much as a factor of 6 for orthogonal polarizations. Focal lengths of primary and secondary foci are shown to compare well with theory.

© 2002 Optical Society of America

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