TITLE

Self-controlled formation of microlenses by optical breakdown inside wide-band-gap materials

AUTHOR(S)
Grojo, D.; Gertsvolf, M.; Jean-Ruel, H.; Lei, S.; Ramunno, L.; Rayner, D. M.; Corkum, P. B.
PUB. DATE
December 2008
SOURCE
Applied Physics Letters;12/15/2008, Vol. 93 Issue 24, p243118
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
By repeatedly illuminating fused silica slabs with focused femtosecond pulses, we permanently decrease the local refractive index without increasing the linear absorption or scattering. This progressively forms a biconvex lens in the prefocal region. With linearly polarized light, the index change reaches several percent and is associated with the formation of an array of planar nanocracks. We analyze the polarization-dependent focusing power of the subwavelength periodic structure. While the detailed material modification changes, spontaneous defocusing lens formation is a common feature of every wide-band-gap transparent materials that we have studied (SiO2, BK7, LiF, sapphire, and mica).
ACCESSION #
35922124

 

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