研究目的
Investigating the dependence of the two-photon absorption coefficient of steel on the pulse duration during its ablation by femto- and picosecond laser pulses.
研究成果
The study demonstrates that the two-photon absorption coefficient of steel increases with the duration of laser pulses, indicating absorption saturation. This provides insights into the electronic subsystem parameters during ultrafast laser ablation.
研究不足
The study is limited to a specific type of steel and laser parameters. The mechanisms of electron dynamics and absorption saturation require further detailed investigation.
1：Experimental Design and Method Selection:
The study involved single-pulse ablation of a steel plate using ultrashort laser pulses of varying durations and energy densities. The depth of ablation craters was measured to analyze the absorption characteristics.
2：Sample Selection and Data Sources:
A steel plate (12Kh18N10T) with an optical-quality surface was used. The ablation was performed on fresh areas of the target.
3：List of Experimental Equipment and Materials:
Ultrashort laser pulses (wavelength 515 nm, duration 0.3–17 ps), micro-objective with NA = 0.65, SWLI 7300 optical profilometer (ZYGO).
4：3–17 ps), micro-objective with NA = 65, SWLI 7300 optical profilometer (ZYGO).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Laser pulses were focused onto the steel surface, and the depth of the resulting craters was measured using an optical profilometer.
5：Data Analysis Methods:
The dependence of crater depth on energy density was analyzed using a two-photon absorption model.
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