Focus Spot Diameter Calculator
Quickly calculate the focused spot diameter based on the laser beam focusing formula
d = 4 · λ · M² · f / ( π · D )
λ is the laser wavelength (input in nm, automatically converted to mm during calculation),
and d is the focused spot diameter (output in μm)
Beam diameter incident on the focusing lens
Ideal Gaussian beam: M² = 1.0
Common: 10600 (CO₂), 1064 (fiber), 532 (green), 355 (UV)
Focal length of the focusing lens
🎯 Focused Spot Diameter
21.676
μm
0.022 mm
d = 4 · 532.000×10⁻⁶ · 1.200 · 80.000 / (π · 3.000) = 0.022 mm = 21.676 μm
⚠️ Please enter valid positive values