研究目的
Investigating the excitation of coherent acoustic and optical phonons by ultrashort extreme ultraviolet (EUV) pulses in a transient grating experiment.
研究成果
The study demonstrates the excitation of coherent acoustic and optical phonons by femtosecond EUV pulses, offering a method to generate tunable GHz to THz acoustic sources in any material without transducer structures. Future work could explore the use of EUV probes to extend the technique's capabilities.
研究不足
The capabilities of the TG experiment are limited by the use of the optical probe, which cannot detect phonons with wavelengths smaller than the optical probe's wavelength.
1：Experimental Design and Method Selection:
The experiment uses two crossed femtosecond EUV pulses to excite coherent phonons, detected via diffraction of an optical probe beam.
2：Sample Selection and Data Sources:
Samples include BK-7 glass, diamond, and Bi4Ge3O
3：List of Experimental Equipment and Materials:
The setup involves a free electron laser for EUV pulses, optical probe beam, and CCD cameras for detection.
4：Experimental Procedures and Operational Workflow:
The EUV pulses form an interference pattern on the sample, exciting phonons detected by the diffracted probe beam at various time delays.
5：Data Analysis Methods:
The diffracted signal is analyzed to identify acoustic and optical phonon modes.
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