title: Spectral measurements of two-photon absorption coefficients for CdSe and GaSe crystals.
abstract: We have measured the spectra of two-photon absorption coefficients for CdSe and GaSe based on a z-scan technique. By using extremely high peak intensities from subpicosecond laser pulses, we observed novel behavior of effective two-photon absorption for CdSe. We compared our results for both crystals with theory as well as with the previous values measured at three and two wavelengths, respectively. For both CdSe and GaSe crystals our measured values are lower than all those reported previously.
authors: Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA.
authors: I B
authors: IB
authors: Zotova
authors: Y J
authors: YJ
authors: Ding