Alternatively, these websites may already contain answers to the topic :
R
Rayleigh length
The distance to the beam waist, until the beam diameter is increased by a factor of √2.
Unit: mm
M2 = Beam quality (laser-dependent)
k = Correction factor, depends on A and D (ideally 1.27; more typically between 1.5 and 2.0)
A = Aperture of the scan system
D = Beam diameter prior to focusing (typically 6 – 70 mm)
λ = Wavelength (typically 193 nm – 10.6 μm)
f = Focal length (typically 30 mm – 2,000 mm)
Lasers as Tools
By transforming lasers into universal tools, scanning solutions help to add functionality and value to materials. SCANLAB's broad palette of scanning solutions fulfills demands for higher speed, more precision, greater efficiency or improved environmental compatibility.
