19 May 2006 Time-resolved photo-phonon spectroscopy
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A rather simple method is discussed to study at once optical absorption spectra, excited-states nonradiative relaxation and propagation of the nonequilibrium phonons emitted during this process in doped dielectrics. The technique utilizes the time-resolved superconductive bolometer detection of these phonons at temperature T=2 K and optical excitation with a pulsed tunable dye laser. Observed, at fixed delay time after the laser pulse action, excitation spectra of the phonons well coincide with already known absorption spectra of both single doped ions and pairs of the nearest neighbors. In some crystals both the satellite lines and uncontrollable impurities lines (Nd3+ in system LaF3:Pr3+) are well resolved in the phonon excitation spectra. This talks about high sensitivity of the used method. Time evolution of the phonon excitation spectra contains in itself the information on energy transfer mechanisms and has allowed to reveal the new types of doped ion cites (Cr3+ in ruby). The study of a time dependence of bolometer signal versus the phonon propagation distance at fixed laser wave length has allowed to determine nonradiative relaxation time, a phonon propagation type and parameters of the phonon scattering rates.
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V. N. Lisin, V. N. Lisin, A. M. Shegeda, A. M. Shegeda, "Time-resolved photo-phonon spectroscopy", Proc. SPIE 6257, ICONO 2005: Nonlinear Laser Spectroscopy, High Precision Measurements, and Laser Biomedicine and Chemistry, 625707 (19 May 2006); doi: 10.1117/12.677953; https://doi.org/10.1117/12.677953

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