title: Direct observation of the transient thermal-lensing effect using the phase-object Z-scan technique.
abstract: A phase-object (PO) Z-scan technique, which can conveniently distinguish the transient thermal-lensing effect from the third-order nonlinear refraction, is described. The PO Z-scan trace of the transient thermal-lensing effect shows a valley-peak shape that is very different from the single-valley (peak) shape of the pure negative (positive) third-order nonlinearity. The nonlinear refraction of the C(70)/toluene solution is investigated by using the PO Z scan with 8 ns pulses at 532 nm wavelength as a test.
authors.affiliation: School of Physical Science and Technology, Suzhou University, Suzhou, China.
authors.forename: Junyi
authors.initials: J
authors.lastname: Yang
authors.forename: Yinglin
authors.initials: Y
authors.lastname: Song