Abstract
Using the close-aperture Z-scan technique, the pure nonlinear refractive index () of carbon disulfide is measured with a 76 MHz repetition rate femtosecond laser. Strong interference of thermal effects exists with high-repetition-rate lasers that result in negative values of . We remove the thermal effect completely by continuously increasing the sample flow rate () in a sample cell as indicated by the change in sign of from negative to positive. The positive value of is due to Kerr-type nonlinearity. At sufficiently high values of of >25 ml/min, all thermal effects are removed, resulting in an value that matches low-repetition-rate experiments.
© 2017 Optical Society of America
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