1：Experimental Design and Method Selection:

The study utilized ultra-short pulsed laser systems with different pulse durations (10 ps and 350 fs) and wavelengths (1064 nm and 1030 nm) to examine the ablation efficiency on AISI 304 steel grade. The influence of spot size and shape (Gaussian and Top Hat) was investigated.

2：Sample Selection and Data Sources:

Stainless steel 1.4301 (AISI 304) samples were used, with surfaces polished with a 3 μm diamond suspension.

3：4301 (AISI 304) samples were used, with surfaces polished with a 3 μm diamond suspension. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment included a FUEGOTM from LUMENTUM (10 ps laser system), a Satsuma HP2 laser system from Amplitude Systèmes (350 fs laser system), Top Hat Beam Shaper FBS2 from TOPAG, scanning slit beam profiler (BP209) from Thorlabs, and a white-light interference microscope (SmartWLI) from GBS.

4：Experimental Procedures and Operational Workflow:

The experiments involved machining craters and squares with different laser peak fluences, measuring crater volumes and depths, and analyzing the structures post-ablation.

5：Data Analysis Methods:

The specific removal rate was calculated based on ablated volume per time and average power. The logarithmic ablation law was applied to deduce threshold fluence and energy penetration depth.