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.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
Falconieri, M., Palange, E., & Fragnito, H. L. (2002). Achievement of λ/4000 phase distortion sensitivity in the measurement of optical nonlinearities by using a modulated Z-scan technique. Journal of Optics A: Pure and Applied Optics, 4(4), 404 - 407. https://doi.org/10.1088/1464-4258/4/4/307