A step-by-step physics breakdown exploring how wavelength and beam geometry fundamentally change the energy delivered to SS304.
1
The laser module generates raw energy based on its maximum wattage. The 15W Blue module generates 3x the raw power of the 5W IR module at the same software setting.
2
Wavelength matters. Polished SS304 is highly reflective to Infrared, but much more absorbent to Blue light.
3
This is a symmetric, Gaussian beam. Because dimensions are identical, it creates a perfect circle, allowing extreme precision without directional distortion.
4
Irradiance is Power per unit Area. Since 1 J/s = 1 Watt, we convert our rate of energy delivery into Intensity (W/mm²). Because the IR spot is 6.8x smaller than the Blue spot, its "heat pressure" is much higher.
5
The duration in seconds that the beam spends crossing its own diameter over a fixed point. A 0.03mm beam crosses 2.7x faster than a 0.08mm beam at the same speed.
6
The ultimate metric for material transformation. High intensity + short duration (IR) results in precise annealing; moderate intensity + long duration (Blue) is better for bulk heating/cutting.
7
How do we match the heat transfer of different modes? This table compares the current settings against the equivalent power needed for other modes to match the same Target Fluence ($J/mm^2$).
This comparison assumes all modes travel at the same speed. Notice the impact of orientation: Switching from Horizontal to Vertical scanning drops the Fluence by 25% (or conversely, switching to Horizontal increases it by 33%), simply by changing which "edge" of the rectangle hits the material first.
Summary: Beam Orientation & Scan Strategy
The 15W Blue module uses a rectangular beam (0.08 x 0.06 mm) specifically oriented for efficiency on galvo systems:
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X-Axis (Wider):
0.08 mm. This is the default scanning axis. The wider edge allows the laser to cover more area per pass, maximizing engraving speed.
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Y-Axis (Sharper):
0.06 mm. By keeping the shorter edge on the Y-axis, the F2 maintains higher vertical resolution for text and fine details as it "steps" through a design.
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Result:
Rotating the scan axis changes the Fluence by ~25–33%, as the beam effectively becomes "thinner" or "wider" relative to its motion.