PRECISION LASER ENGRAVING & SURFACE COLORING

MOPA Fiber Laser Color Marking & Annealing Calculator

Calculate pulse duration (2–350 ns), pulse overlap %, hatch pitch, and oxide layer thickness (TiO₂ / Cr₂O₃) for brilliant interference color marking on Grade 5 titanium and stainless steel.

1. Substrate & Desired Color

Substrate Metal

Target Optical Interference Color

2. MOPA Laser Parameters

Pulse Duration (ns)

Short pulses (2-15ns) yield vibrant colors; long pulses (100-350ns) yield dark blacks.

Pulse Frequency (kHz)

High frequency (250 - 600 kHz) prevents surface ablation.

Marking Scan Speed (mm/s)

Hatch Line Pitch (µm)

Line spacing (typically 3 µm – 8 µm for dense oxide films).

Oxide Physics & Hatch Metrics

Estimated Oxide Film

45 nm

Interference thickness

Pulse Overlap (Op)

93.5 %

Along-vector spot overlap

Line Hatch Overlap (Ol)

85.7 %

Across-vector overlap

Process Regime

Pure Oxidation

Ablation vs Annealing

SIMULATED OXIDE INTERFERENCE COLOR:

                            Light Gold (45 nm)
                        

Optical Film Equation:

                            2 × n_oxide × d × cos(θ) = (m - 0.5) × λ
                        

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