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Here you'll find explanations and definitions of key technical terms from the fields of optics, scanner technology, laser technology and laser processing.
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The distance to the beam waist, until the beam diameter is increased by a factor of √2.
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)
Repeatability describes the precision of multiple moves to the same point within a short time period (from a few milliseconds up to five minutes).
During repeated moves to a position within a short time period (from a few milliseconds up to five minutes), deviations will occur between the repetitions. For a warmed-up system (warm-up: 30 minutes) with steady ambient temperature and operational conditions, the imprecision's standard deviation (RMS) lies within the specified range. Here, it is assumed that dither averages out.
Systems with digital encoders have clearly superior repeatability.
The Root Mean Square is identical to the standard deviation sigma if it fluctuates around 0. Here it is used synonymous with sigma.