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Focal spot size calculator
Wavelength λ
nm
pm
nm
um
mm
m
Beam quality M
2
Focal length f
mm
um
mm
cm
m
Beam diameter D
Lens
on the lens
mm
um
mm
cm
m
Beam diameter D
Spot
at the waist
um
um
mm
cm
m
Rayleigh range z
R
at the waist
mm
um
mm
cm
m
km
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Instructions coming soon
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