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(a) The absorption (left line) and PL spectra of Ph-TPA2 in solution (middle line) and crystal (right line). Inset: The chemical structure of Ph-TPA2. (b) X-ray powder diffraction pattern of the Ph-TPA2 crystal. Inset: The photograph of the crystal under fluorescence microscope.
Normalized light emission spectra of Ph-TPA2 crystals at five different the intensity of the incident laser light (A) , (B) , (C) , (D) , (E) . Inset: Scheme of four-level mechanism including vibration sublevels.
FWHM and PL peak intensity (inset) of self-waveguided light emission of a Ph-TPA2 single crystal as a function of the incident laser energy intensity.
(a) Fluorescence spectra taken under the polarizer with the polarization of and 110 pumped at . Inset: dependence of the output intensity at peak position on polarization of angle. (b) Fluorescence spectra taken with the polarization of and 110 pumped at . Inset: dependence of the output intensity at peak position on polarization of angle.
Threshold of ASE for different crystals (a) pumped by two-photon (800 nm) and (b) single photon.
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