Side Viewing Interferometric Probe Alignment for near Vertical Steel Sidewalls
Aligning side-viewing optical probes on vertical steel sidewalls requires tip-tilt control within 0.05 degrees to preserve coherence fringe visibility.
Rayleigh Range Focusing
Meaning
Optimization of the laser beam waist over a specific distance where the light stays concentrated. In the laser marking or cutting of polymer sheets, rayleigh range focusing determines the depth of field available for a clean, consistent melt. This parameter defines the vertical tolerance within which the laser energy remains effective for processing.
Marking Consistency
Variation in part height or slight warpage can move the surface out of the ideal focal point. Utilizing rayleigh range focusing ensures that the characters or codes remains sharp even on slightly curved surfaces. This prevents the fading of logos on molded housings.
Cutting Quality
Thick polymer slabs require a long zone of high intensity to maintain a straight edge. Achieving the correct rayleigh range focusing allows the beam to penetrate the full thickness without excessive widening at the bottom of the cut. This minimizes the heat affected zone and prevents the charring of the plastic.
Optimal lens selection balances the spot size against the depth of focus. A shorter range provides a smaller spot but less tolerance for height changes.
Process Window
Stable production requires a setup that tolerates minor variations in material thickness. Good rayleigh range focusing provides the latitude needed to handle these drifts without manual adjustment.