Abstract

We report on an unambiguous observation of the third-order nonlinear optical effect, spatial self-phase modulation (SSPM), in a ${\mathrm{MoTe}}_2$ dispersion. The values of the third-order nonlinear optical coefficients effectively for one-layer ${\mathrm{MoTe}}_2$, ${\chi }_{\text{one-layer}}^{(3)}$, are obtained through the SSPM method at excitation wavelengths 473, 532, 750, and 801 nm, respectively. The wind-chime model is used to explain the ring formation time. The wavelength dependence of ${\chi }_{\text{one-layer}}^{(3)}$ compares well with the photo-absorption spectra. Significantly, we find a correlation between ${\chi }^{(3)}$ and the carrier mobility $\mu$ or effective mass $m*$, which again further supports the laser-induced ac electron coherence in 2D materials.

© 2019 Optical Society of America

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