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We present a technique in which small solute nonlinearities may be extracted from large solvent signals by performing simultaneous Z-scans on two samples (solvent and solution). By using a dual-arm Z-scan apparatus with identical arms, fitting error in determining the solute nonlinearity is reduced because the irradiance fluctuations are correlated for both the solvent and solution measurements. To verify the sensitivity of this technique, the dispersion of nonlinear refraction of a squaraine molecule is measured. Utilizing this technique allows for the effects of the solvent n2 to be effectively eliminated, thus overcoming a longstanding problem in nonlinear optical characterization of organic dyes.


Sourced from the version of record at OSA:
Ferdinandus, M. R., et al (2012). Dual-arm Z-scan technique to extract dilute solute nonlinearities from solution measurements. Optical Materials Express, 2(12), 1776.

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Optical Materials Express