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Glossary of laser cutting terms - D
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Depth Of Field
The working range of the focused beam. It is determined as
a function of wavelength, diameter of the unfocused beam,
and the focal length of the lens. A shorter focal length produces
a smaller depth of the field.
Divergence
The angle at which the laser beam spreads in the far field;
the bending of rays away from each other, usually accomplished
by a concave lens or convex mirror.
Drift
All undesirable variations in laser output (either amplitude
or frequency).
Dross
The residue of resolidified melt on the lower edge of the
laser cut. Using pulsed laser cutting and increased oxygen
pressures can reduce dross. Cuts with higher dross are often
the result of using poor quality steel, the existence of surface
rust, or incorrect process parameters.
Duty Cycle
The length of time the laser beam is actually cutting, drilling,
welding, or heat-treating, as compared to the entire work
cycle time. The Duty Cycle is described as a percentage of
laser on time, in relation to pulse period. An example is
a 1.0 millisecond pulse length with a 4.0 millisecond pulse
period (250 Hz) which produces a 25% duty cycle.
DXF Format/DXF File
Drawing Interchange Format (DXF) files or Drawing eXchange
Format. Originally developed by AutoDesk to ease the transferring
of files between AutoCAD and other software systems, DXF has
become a de facto industry standard. Most CAD,
drawing, mapping and GIS software packages have some ability
to import DXF files.
DWG File
An AutoCAD Drawing file. The official specification for this
file format is proprietary to AutoDesk Corporation, which
makes it difficult for third party vendors to be compatible
with it.
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