Skip to main content

glossar_laser_scan_technik_scanpedia

Glossary

SCANpedia - welcome to the SCANLAB GmbH encyclopedia.

Here you'll find explanations and definitions of key technical terms from the fields of optics, scanner technology, laser technology and laser processing.

If you'd like to see a specific new term added to our encyclopedia, then just drop us an email.

Use tags to classify products

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)

Repeatability

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.

RMS

The Root Mean Square is identical to the standard deviation sigma if it fluctuates around 0. Here it is used synonymous with sigma.

© SCANLAB GmbH, All rights reserved

Siemensstr. 2a82178 Puchheim, GermanyPhone +49 89 800746-0Click to send email