From optics fundamentals to practical engraving — the physics and techniques behind hobbyist fibre lasers like the XTool F2.
A galvo fibre laser is a very different machine from a diode or CO₂ system. Understanding the optics (how the beam is steered and focused), energy delivery (power, speed, density), and material interaction (how different surfaces respond to IR energy) unlocks consistent, repeatable results rather than trial-and-error.
The comprehensive 18-module interactive curriculum. From first principles of optics to thermodynamics and chemical safety.
18 Modules · Full ProgressionHow the galvanometric mirrors steer the beam, what beam divergence means in practice, and why the focused spot forms an hourglass shape that affects cut quality in thick materials.
Galvo · Divergence · mrad · Spot SizeEnergy density (J/mm²) as the fundamental parameter. How power percentage, feed rate, and line count combine to control how much heat reaches the material.
Energy Density · J/mm² · Feed RateWhy Power is linear but Speed is exponential. Understanding the $1/x$ energy spike and the thermal diffusion limit in stainless steel.
Non-Linear · $1/x$ · Inverse RelationshipHow resolution settings change the thermal dose. Interactive overlap visualizer, unit converter, and the "HD Trap" in metal marking.
Density · LPCM · DPI · OverlapStep-by-step interactive breakdown of how raw optical power translates into material-level irradiance and fluence. Compares IR and Blue diode lasers.
Absorption · Irradiance · FluenceHow thermal accumulation creates a moving front of stress. Interactive tutorials on area size, corner tapering, and peak stress management.
Heat Wall · Peak Stress · Thermal DiffusionWhy metallic colors turn frosted or pastel. Understanding specular vs. diffuse reflection and the physical surface changes on stainless steel.
Specular · Diffuse · Morphology · SS304The Rayleigh range, working distance calibration, and what happens when you deliberately defocus to spread energy over a larger spot.
Rayleigh Range · Working Distance · DOFVector fill vs raster scan, lines-per-centimetre density, unidirectional vs bidirectional hatching, and crosshatch — how fill strategy changes heat distribution.
Vector · Raster · LPC · CrosshatchHow IR fibre lasers interact with stainless steel, aluminium, brass, wood, acrylic, and leather. What to avoid and why certain materials need special settings.
Metals · Wood · Acrylic · AnodisedLaser classes, OD ratings for eyewear, fume extraction requirements by material, and enclosure guidelines for fibre galvo systems.
Laser Class · OD Rating · Fumes · PPEHow to remove soot and oils without damaging the thin oxide layer. Guidance on ultrasonic cleaners, IPA, and avoiding abrasives.
Ultrasonic · IPA · Oxide Layer · MaintenanceInteractive tools and interactive models for testing specific material reactions and physics hypotheses.
Why IR laser heat produces structural colours in stainless steel — thin-film interference, Arrhenius oxide growth kinetics, and thermal integration.
Cr₂O₃ · Interference · ArrheniusInteractive 2D maps exploring the relationships between power, speed, and density for structural interference colours on steel.
2D Map · Heat Map · SS304 · Calibration