Polarization-sensitive micro-optic structures produced inside fused silica substrates with femtosecond laser pulses. Bottom: A cross-polarized light view (left) of a 2D array of polarization imprints in bulk material (right).

From the article:

Revealing Local Field Structure of Focused Ultrashort Pulses
Cyril Hnatovsky, Vladlen Shvedov, Wieslaw Krolikowski, and Andrei Rode
Phys. Rev. Lett. 106, 123901 (2011)

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