Laser Defocus Effect Calculator

Professional laser defocus effect calculator for processing optimization and beam analysis. Calculate beam diameter changes, power density variations, and processing effects due to focal position shifts.

Beam Defocus Analysis

Focal Length

Input Beam Diameter

Wavelength

Defocus Distance

Beam Quality (M²) beam quality factor

Defocus Analysis Results

Beam Parameters

Beam Diameter at Defocus: -

Diameter Increase: -

Power Density: -

Power Density Ratio: -

Processing Impact

Cutting Quality: -

Penetration Depth: -

Process Efficiency: -

Heat Affected Zone: -

Optimization Results

Optimal Z-Position: -

Depth of Focus: -

Position Sensitivity: -

Recommendation: -

Beam Profile vs Position

Key Formulas

Beam Diameter:

w(z) = w₀√(1 + (z/z₀)²)

Rayleigh Range:

z₀ = πw₀²/(λM²)

Power Density:

I = 4P/(πw²)

Processing Effects

Positive Defocus: Larger spot, lower density
Negative Defocus: Convergent beam, heat buildup
Optimal Focus: Maximum power density
Extended DOF: More forgiving positioning

Applications

Cutting: Focus position affects edge quality
Welding: Defocus controls penetration
Drilling: Taper control with focus
Marking: Line width and contrast

Optimization Tips

Thick Materials: Slight positive defocus
Thin Materials: Focus on top surface
Speed vs Quality: Balance with defocus
Material Variations: Extended DOF helps

⚠️ Processing Safety

Defocus Safety Warning: Changes in focal position can dramatically affect processing results and may cause material damage, incomplete cuts, or dangerous reflections. Always test defocus settings on sample materials and ensure proper beam containment at all focal positions.