Description
In a CO2 laser cutter, every optical surface between the tube and the material costs power. A dirty mirror costs a few percent. A mirror with a poor coating costs far more, and the loss shows up as slow cuts, charred edges and a tube working harder than it should. This silicon reflector is specified at 99.6% reflectivity with a black coating on the back face, which is the combination that keeps delivered power high and stray reflections low.
The substrate is silicon rather than glass, which matters for two reasons. Silicon holds its flatness under heat, so the beam does not wander as the mirror warms during a long job. It also takes the dielectric coating more evenly, which is where the reflectivity figure comes from. The black-coated back face absorbs rather than reflects, so light that passes the coating does not bounce back into the cavity and disturb the beam.
The mirror is sized for standard 500W-class CO2 installations and fits the common mirror mounts used on Chinese and imported laser cutters. Handling matters: the coated face should never be touched, and cleaning is done with a lens tissue and approved solvent rather than a cloth. Replacing all three mirrors in a beam path at once is the standard practice, because a new mirror next to a worn one simply moves the loss to the older surface.
Optics are the cheapest part of a laser and the most expensive thing to neglect.
What Sets It Apart
- ✦99.6% reflectivity silicon substrate for minimal power loss per bounce
- ✦Black-coated back face to absorb rather than reflect stray light
- ✦Silicon holds flatness under thermal load, keeping the beam stable during long jobs
- ✦Dielectric coating applied evenly across the aperture
- ✦Fits standard 500W-class CO2 mirror mounts
- ✦Compatible with common imported and domestic laser cutter heads
- ✦Supplied individually packed to protect the coated surface in transit
Technical Specifications
- Substrate: Silicon (Si)
- Reflectivity: 99.6%
- Back coating: Black absorbing coating
- Laser type: CO2, 500W class
- Mount: Standard CO2 mirror mount
- Surface: Dielectric coated, do not touch
- Cleaning: Lens tissue with approved solvent only
- Application: Beam delivery optics in CO2 laser cutters and engravers
- Replacement practice: Replace all mirrors in the beam path together
- Packing: Individually packed, coated face protected
Where It Belongs
For laser cutter owners doing maintenance on a machine that has lost cutting power, and for anyone assembling or rebuilding a beam path. It suits 500W-class CO2 systems used for acrylic, wood, leather and coated metals. If a machine is cutting slowly and the tube is known-good, the mirrors are the first thing to inspect, and replacing a pitted reflector usually restores the original feed rate.
Questions Buyers Ask
Q: Will it fit my laser cutter?
A: It fits standard 500W-class CO2 mirror mounts. Measure the existing mirror diameter and mount type before ordering, since mounts vary between machines.
Q: How do I clean it?
A: Lens tissue with an approved optical solvent, wiping in one direction only. Never use a cloth, and never touch the coated face with fingers.
Q: Should I replace all mirrors at once?
A: Yes. A new mirror beside worn ones moves the loss to the older surfaces and the cut quality does not improve as expected.
Q: How do I know the mirror is worn?
A: Visible pitting, a hazy coating, or a measurable drop in cutting power at unchanged settings. Inspect under oblique light.
Q: Is the back coating important?
A: It absorbs stray light rather than reflecting it back into the cavity, which keeps the beam stable and reduces stray reflections inside the machine.
Q: Is it fragile in transit?
A: Silicon is more robust than glass but the coating is delicate. It ships individually packed with the coated face protected, and should be handled by the edges.
Q: How often should mirrors be replaced?
A: Inspect monthly on a machine in daily production and replace when pitting or haze appears. Most shops replace the set once a year.
Q: Does reflectivity degrade over time?
A: Yes, slowly, through contamination and cleaning marks. The 99.6% figure is the new-part specification and is the benchmark for deciding when to replace.
Q: Is it safe to handle by the edges?
A: Yes, hold by the edges only. Fingerprints on the coated face leave oils that burn into the coating under the beam.
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