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A CO₂ mirror is not a generic upgrade: diameter, thickness, substrate, coating, wavelength and the mirror mount all have to agree. This list concentrates on actual 20 mm × 3 mm replacement products—the common size must still be measured on the removed part and mount. Never run an open or misaligned laser path; power down, follow the machine manual, use the correct laser-safety controls and have a qualified technician handle uncertain alignment.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | LightObject LSR-MIR20MO 20 mm Molybdenum Mirror | $15 | Amazon |
| 2 | EMP Laser 20 mm Si Reflective Mirror | $39 | Amazon |
| 3 | Cloudray CO₂ Si Reflective Mirror, 20 mm × 3 mm | $24 | Amazon |
| 4 | Faomic Mo CO₂ Mirror 20 mm × 3 mm | $337.25 sale price | Amazon |
| 5 | Gravierbedarf SP20MO Molybdenum Mirror | $20–$25 | Amazon |
| 6 | Plexishop Silicon Gold-Coated 20 mm Mirror | $20–$35 | Amazon |
| 7 | Plexishop Molybdenum 20 mm Mirror | $15–$30 | Amazon |
| 8 | Daisy Designs 20 mm Molybdenum Mirror 3-Pack | $20–$40 | Amazon |
| 9 | TEN-HIGH 20 mm Molybdenum Mirror 3-Pack | $15–$30 | Amazon |
The picks, in detail
LightObject LSR-MIR20MO 20 mm Molybdenum Mirror
A 20 mm molybdenum reflection mirror marketed for 60–100 W CO₂ lasers.
- 20 mm diameter
- molybdenum substrate
- 60–100 W stated use
- Named SKU
- Current $15 listing
- Confirm thickness at seller
- Lower reflectivity than premium coated optics
EMP Laser 20 mm Si Reflective Mirror
EMP’s 20 mm × 3 mm gold-film silicon mirror is specified for 10.6 µm CO₂ use and 60–300 W, including Aeon MIRA 5, 7 and 9 mirror-three positions.
- 20 mm diameter
- 3 mm thickness
- gold-plated silicon
- Named machine compatibility
- Current $39 listing
- Machine-specific fit claim
- Handle coating carefully
Cloudray CO₂ Si Reflective Mirror, 20 mm × 3 mm
A Cloudray silicon mirror variant with a gold single-side or black double-side polished option; select the 20 mm and 3 mm variant explicitly.
- 20 mm option
- 3 mm option
- silicon substrate
- Current manufacturer listing
- Coating choices stated
- Variant selection is essential
- Not a substitute for mount measurement
Faomic Mo CO₂ Mirror 20 mm × 3 mm
A polished, uncoated molybdenum mirror specified as 20 mm diameter and 3 mm thick for CO₂ cutting and engraving machines.
- 20 mm diameter
- 3 mm thickness
- uncoated molybdenum
- Exact dimensions published
- Hard metal surface
- Listed in a non-US market
- Uncoated construction
Gravierbedarf SP20MO Molybdenum Mirror
The SP20MO is a 20 mm diameter, 3 mm high molybdenum CO₂ mirror; its supplier notes a lower reflection rate but harsh-environment suitability.
- 20 mm diameter
- 3 mm thickness
- molybdenum
- Exact SKU
- Published supplier price
- Reported unavailable
- Lower-reflection substrate
Plexishop Silicon Gold-Coated 20 mm Mirror
A silicon, gold-coated CO₂ mirror listed at 20 mm diameter, 3 mm thickness and 10.6 µm wavelength.
- 20 mm diameter
- 3 mm thickness
- gold-coated silicon
- Exact CO₂ wavelength
- Exact dimensions
- International supplier
- Protect coated face from fingerprints
Plexishop Molybdenum 20 mm Mirror
A separate Plexishop molybdenum mirror listing specifies a 20 mm diameter and 3 mm thickness for CO₂ laser service.
- 20 mm diameter
- 3 mm thickness
- molybdenum
- Separate substrate choice
- Exact dimensions
- International supplier
- Confirm stock and price
Daisy Designs 20 mm Molybdenum Mirror 3-Pack
A three-pack of 20 mm molybdenum mirrors described for 10.6 µm / 10,600 nm CO₂ laser use.
- 20 mm diameter
- 3-pack
- 10.6 µm stated wavelength
- Spare set
- CO₂ wavelength stated
- Confirm thickness before purchase
- Molybdenum optical trade-off
TEN-HIGH 20 mm Molybdenum Mirror 3-Pack
TEN-HIGH sells a three-piece 20 mm molybdenum mirror set for CO₂ engraving and cutting machines.
- 20 mm diameter
- 3 pieces
- molybdenum
- Three replacement mirrors
- Named maker
- Confirm thickness with listing
- Check machine mount first
Buying tips
- Measure the old mirror with calipers: diameter and thickness must match the holder; 19.05 mm is not 20 mm.
- Match a coating/substrate to the machine’s specified 10.6 µm CO₂ optical path; do not use a visible-light mirror.
- Wear clean gloves or finger cots, avoid touching the optical face and follow the manufacturer’s alignment procedure with the laser made safe.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.