We used optical laser pulses to create transient gratings (TGs) with sub-10 microm spatial periodicity in a Bismuth Germanate (310) (Bi4Ge3O12) single crystal at room temperature. The TG launches phonon modes, whose dynamics were revealed via forward diffraction of a third, time-delayed, heterodyne-detected optical pulse. Acoustic oscillations have been clearly identified in a time-frequency window not covered by previous spectroscopic studies and their characteristic dynamic parameters have been measured as a function of transferred momenta magnitude and direction.
BGO relaxation dynamics probed with heterodyne detected optical transient gratings / Danny Fainozzi; Sara Catalini; Renato torre; Claudio Masciovecchio; Cristian Svetina. - ELETTRONICO. - arxiv:(2023), pp. arXiv:2309.02308.0-arXiv:2309.02308.0. [10.48550/arXiv.2309.02308]
BGO relaxation dynamics probed with heterodyne detected optical transient gratings
Sara Catalini;Renato torre;
2023
Abstract
We used optical laser pulses to create transient gratings (TGs) with sub-10 microm spatial periodicity in a Bismuth Germanate (310) (Bi4Ge3O12) single crystal at room temperature. The TG launches phonon modes, whose dynamics were revealed via forward diffraction of a third, time-delayed, heterodyne-detected optical pulse. Acoustic oscillations have been clearly identified in a time-frequency window not covered by previous spectroscopic studies and their characteristic dynamic parameters have been measured as a function of transferred momenta magnitude and direction.
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