Achievement of λ/4000 phase distortion sensitivity in the measurement of optical nonlinearities by using a modulated Z-scan technique

Mauro Falconieri, Elia Palange, Hugo L. Fragnito

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We report on a modulation detection system that efficiently improves the signal-to-noise ratio and the maximum achievable sensitivity of Z-scan measurements of purely optical nonlinearities. By using suitable signal processing electronics and combining an averaging procedure with the harmonic motion of the sample around the Z-scan lens focus position, we demonstrate an increase of the measurement sensitivity of more than one order of magnitude, which is in principle independent of the particular Z-scan set-up employed. The consequence is that nonlinear phase distortions of λ4000 can be easily measured and improvements up to λ/105 are foreseen.
Original languageEnglish
Pages (from-to)404 - 407
Number of pages4
JournalJournal of Optics A: Pure and Applied Optics
Issue number4
Publication statusPublished - Jul 2002
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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