研究目的
Investigating the ultrafast broadband diagnostics of the filling of the s band at the two-photon femtosecond laser excitation of a gold film.
研究成果
The study demonstrated the effect of the appearance and subsequent blueshift of the long-wavelength edge of the spectra of the extinction coefficient of the gold film with an increase in the peak power of pump pulses, attributed to the population of electronic states of the Au s band through two-photon d–s interband transitions.
研究不足
The study is limited by the experimental errors primarily caused by the generation of supercontinuum radiation and the time and spatial averaging of transmittance over the film excitation region.
1：Experimental Design and Method Selection:
The study involved the transmission of near-infrared femtosecond laser pulses and supercontinuum radiation through a 50-nm gold film immersed in water. The power of focused laser radiation was varied in the range of 1–10 GW.
2：Sample Selection and Data Sources:
50-nm gold films prepared from a
3：99%-purity solid gold target by low-vacuum magnetron deposition on a 2-mm-thick fluorite substrate were used. Optical transmittance spectra were obtained on a SF-2000 spectrophotometer. List of Experimental Equipment and Materials:
Ti:sapphire laser (800 nm, 100 fs, 10 Hz), K-8 glass lens, K-8 input window, AvaSpec-ULS3648-USB2 spectrometer.
4：Experimental Procedures and Operational Workflow:
The laser radiation was focused on the surface of a gold film into a cell filled with water. Supercontinuum radiation spectra were collected from 100 pulses using a spectrometer.
5：Data Analysis Methods:
The transmission spectra of the film were normalized to the spectra of the incident supercontinuum radiation at the same powers. The extinction coefficient was calculated from the transmission coefficient.
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