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In laser applications such as optical data storage and photolithography, focused spot size can be reduced beyond the diffraction limit with an optically nonlinear medium. Using the transmittive and reflective Z-scan technique with a 10 Hz, frequency doubled, Q-switched and mode-locked Nd:YAG laser, the beam shrinkage with an Sb thin film is confirmed. We infer that plasma reflection is the mechanism.
© 2011 AOS
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