Femtosecond vibrational photon echo in CeO2-doped TeO2–Nb2O5–ZnO glass

Abstract

Vibrational photon echo decay in the CeO2-doped TeO2–Nb2O5–ZnO glass is observed with near-infrared femtosecond laser pulse at the temperature of 7.5 and 300 K. The photon echo signals exhibit an initial fast decay followed by an exponential decay. The anharmonic frequency splitting (Δ), the dephasing rate (γ), the dephasing time (Td) and the linewidth (Γ) are obtained. The results show that the dephasing time of the ν=0→1 transition is dominated by the vibration state lifetime T1l, and the dephasing time of the ν=0 →2 transition is determined by both the vibration state lifetime T2l and the pure dephasing time T2d∗.