Abstract
We report on DFWM spectroscopy on the asymmetric stretching mode in a-SiO x with x from 0.1 to 1.11. For a-SiO 0.1, a 10 K lifetime of 2.8 ps is obtained using laser-induced transient grating spectroscopy. Two-pulse photon echo measurements reveal phase dynamics having a temperature dependent component due to elastic phonon scattering and an excitation dependent component suggesting the presence of non-equilibrium Si–Si modes. At high excitation densities, the DFWM signal is dominated by a quasi-thermal grating whose population decay is extremely long lived (⪢1 ns) . This effect is enhanced as the oxygen concentration is increased.
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