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 . The embedded zone plates shown in this Letter exhibit efficiencies that vary by as much as a factor of 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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