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The following Wavefront Distortion specifications are recommended:
Wavefront Distortion (transmission) measured at 633 nm
1. Within laser clear aperture: Over any 1.0 mm diameter area.
• optical power measured in any direction: <0.050 waves
• irregularities after subtracting optical power and astigmatism: <0.120 waves (P-V) and < 0.015 waves (RMS).
2. Within collection clear aperture: < 10 waves (P-V).
Collection Beam Geometry
Figure 2-2
also illustrates the beam envelope entering the scan engine. Ensure that the collection path is free of obstructions for full
scan angle performance.
Laser Clear Aperture
The laser clear aperture is the area on the exit window that intersects the exit beam envelope as shown in
any instance in time, the outgoing laser beam is collimated and approximately 1 mm in diameter, while during scanner operation the
beam is constrained within the exit beam envelope. For dimensions and information about clear aperture calculations see
Window Characteristics on page 2-10
Figure 2-2. Clear Apertures
and
Exit Window Positioning on page 2-11
Figure 2-3. Exit Beam Envelope
Installation 2-5
Figure
2-3. Note that at
Exit
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