研究目的
To determine the laser-induced ablation threshold fluence in air of aluminum and tungsten excited by single near-infrared laser pulses with duration ranging from 15 to 100 fs and to measure the reflectivity providing access to the deposited energy in the studied materials.
研究成果
The ablation threshold fluence is constant for both aluminum and tungsten across the tested pulse duration range, extending the ablation threshold scaling metrics to few-optical-cycle laser pulses. The reflectivity measurements and simulations highlight the importance of considering the density of states in transition metals like tungsten for accurate modeling of laser–metal interactions.
研究不足
The study is limited to aluminum and tungsten under specific laser pulse conditions. The simulation approach assumes instantaneous thermalization of the electronic population, which may not account for all complexities in the interaction.
1：Experimental Design and Method Selection:
The study uses single near-infrared laser pulses with durations from 15 to 100 fs to excite aluminum and tungsten samples. The ablation threshold fluence is determined, and reflectivity is measured to access deposited energy. A simulation approach based on the two-temperature model and the Drude–Lorentz model is developed.
2：Sample Selection and Data Sources:
Aluminum (GoodFellow AL0065, high purity 99.99%, thickness of 0.5 mm) and tungsten (GoodFellow W000375, high purity 99.95%, thickness of 2.0 mm) are used as test materials.
3：99%, thickness of 5 mm) and tungsten (GoodFellow W000375, high purity 95%, thickness of 0 mm) are used as test materials.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The beam line 5a of ASUR platform at LP3 laboratory delivers linearly polarized 30 fs pulses at 100 Hz repetition rate with a central wavelength of 800 nm. Two experimental configurations were used for varying pulse durations.
4：Experimental Procedures and Operational Workflow:
The incident and reflected energy of the pulse are measured by photodiodes for each single shot at a given energy (fluence). The reflected signal is collimated and redirected for measurement.
5：Data Analysis Methods:
The evolution of reflectivity is analyzed using the two-temperature model and Drude or Drude–Lorentz models to describe the interaction and calculate the evolution of electronic and lattice temperatures.
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