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CNCOLETECH

CO2 Laser Lens 20mm FL:2.5" or 63.5mm Mirror ZnSe Focus Focal Lens for Engraving/Cutting 40W-200W

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Availability: 11 left in stock
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Arrives Wednesday, Oct 21
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Size: Dia: 20mm FL:2.5"/63.5mm


Features

  • Material: High class CVD ZnSe material (US II-VI). High-quality materials ensure more stable laser system; excellent High-Power density endurance. Compatible power: 40W-200W.
  • Diameter: 20mm/0.79"; Focal Length:63.5mm/2.5"; Thickness:2.0-2.2mm/0.08"; Transmittance: 99.8%.
  • Exquisite Coating Process: Superb Double-sided solid coating, increase service life, precision slicing, polishing and grinding process, Reduced laser loss, wiping resistant, high temperature resistance, excellent optical properties, high working efficiency.
  • High efficiency: CVD ZnSe Laser Focus Lens has smaller focusing spot size, the energy is more concentrated, making the CO2 laser engraving, cutting machine more efficient.
  • Usage: CO2 replacement laser lens are mainly used in CO2 laser engraving and cutting well.
  • Lens Shape: Plano-convex( some meniscus shape may mixed together when manufacturing, but it is the same effect as Plano-convex shape).

Description

(1) Ensure that the air cooling is good, otherwise the temperature will be too high and the lens will overheat and crack (2) There are condensation water drops in the lens barrel, which may cause the lens to break. (3)The lens is stuck or pollute with the jets of the cut or engrave material, Uneven heating for a long time is easy to cause broken. It should be cleaned with cotton ball dipped in absolute alcohol or acetone in time. (4) When adjusting the light path, the light path is not correct, the laser accidentally hit the edge of the lens and the junction of the lens barrel, resulting in broken. Focal length is the distance between the lens and the workpiece(material being cut or engraved). Before replace or install the lens, please confirm the diameter and focal length firstly. It is recommended to use convex upward, flat or concave facing the engraving or cutting material. PVD ZnSe Laser Lens CVD ZnSe Laser Lens GaAs Laser Lens Si Laser Mirror Mo Laser Mirror Cu Laser Mirror

Brand: CNCOLETECH


Material: CVD ZnSe


Color: Fl2.5"/63.5mm


Style: CVD ZnSe Lens


Item Weight: 0.03 kg


Brand Name: CNCOLETECH


Unit Count: 1 Count


Manufacturer: Shanghai Top Nine Industiral Co.,Ltd


Number of Items: 1


Model Number: IIVI-20-635


Manufacturer Part Number: IIVI-20-635


Color: Fl2.5"/63.5mm


Style Name: CVD ZnSe Lens


Item Weight: 0.03 kg


Material Type: CVD ZnSe


Operation Mode: Automatic


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Oct 21

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • I’d recommend this lens
Size: Dia: 15mm FL:2"/50.8mm
Works great for my laser cutter and it’s a good price.
Reviewed in the United States on July 5, 2025 by CJ
    • Quality
Size: Dia: 18mm FL:2"/50.8mm
I'm sure it's a good product but I had to return it because I ordered the wrong size
Reviewed in the United States on June 19, 2025 by Margaret
    • Drop in replacement for Boss Laser LS1420
Size: Dia: 20mm FL:2"/50.8mm
The 20mm FL:2" is a perfect drop-in replacement for the default focus lens on the Boss LS-1420 laser. Boss wants $100 for their lens but I found that this one was much cheaper and had all the same specs. So far I've run my laser for about 10 hours engraving and cutting 1/4" solid cedar and 1/8" baltic ply and am getting sharp engraves at 385mm/s, and clean single pass cuts. Just make sure you wipe your lens down often during jobs and get a good air compressor. My original lens lasted three years before I replaced it with this due to my own negligence. I've picked up another spare just in case I forget to wipe the lens down again. Make sure to pay attention to the direction of the curve on the lens, and also make sure to wipe down all your mirrors while you're swapping out the lens. Wear gloves and only handle the sides of the lens. ... show more
Reviewed in the United States on October 20, 2022 by Customer Review
    • Good quality! Amazing for tumblers with tabs for removable handles!!
Size: Dia:12mm FL:101.6mm/4"
I have only had my new lens for about a week and it's making a world of difference for my laser engraving business! I highly recommend this product!! Works great for tumblers with tabs for handle. UPDATE!: I have had the lens for about 10 months and the coating has started to flake off. Honestly I'm not really upset about it as it is only a $30 replacement part. Overall I am still happy with this lens! ... show more
Reviewed in the United States on November 25, 2024 by Cazer
    • work with universal laser cutter, just barely fits. cuts fine.
Size: Dia: 19mm FL:2"/50.8mm
I bought a 2.0" focal length CVD IIVI ZnSe lens, 19mm diameter. This lens is thicker at the edge than OEM lenses from universal laser, but it just barely fits, and cuts well enough so far. I bought another one that is listed as plano-convex like the OEM lens, but it is out of spec and too thick to use. The plano convex lens from universal laser is about 2.3mm thick, and 1.75mm thick at the edge. One caveat, which may or may not apply to all replacement lenses, is that you will need to re-calibrate your height adjustments to match the new lens. This one works best for me when I change the calibration from the original lens and set at -0.100" and re calibrate. This makes the table a bit higher, and makes the laser focus tighter than if not calibrated. I made a bunch of test cuts, going first with the calibration that worked for the OEM lens, and moving the table up in 0.050" increments. the kerf got smaller, at .050, smaller still at .100, and then started to get wider at .150 as I raised the table above the ideal focal length. seems to cut on par with a used OEM lens, using the same settings, once z height is recalibrated. I have not compared to a new OEM lens right out of the box. Given the price of this lens vs. the OEM lens, I am ok with having to re-calibrate in order to save some money. I have a universal VLS-6.60 cutter that I am using this in using the OEM aluminum lens holder. I removed the broken lens by soaking in acetone for a few minutes to soften old glue. After carefully cleaning old glue from aluminum holder, I used loctite AA 352 adhesive (a UV setting acrylic adhesive), and cured the glue with a small blacklight for a few minutes. clean up of any stray glue with a q-tip dipped in acetone was simple and easy. Make sure the lens is in the holder the right way. The convex side goes facing the aluminum lens holder. glue only in the corners of the holder if you don't want a giant mess. this takes a little bit of skill, but it is entirely doable, and seems worth the effort so far. ... show more
Reviewed in the United States on January 19, 2018 by JB
    • Great Product Fast Delivery
Size: Dia: 18mm FL:2"/50.8mm
Was literally burning through lenses left and right. Contacted manufacturer and they pointed me towards this lens. Such a difference in quality and performance when you have the right lens! If you have a CO2 Laser, this is the focal lens you need! My machine manufacturer wouldn't list the specs for replacement lenses because they want to sell to you after market parts. (Not mentioning names, but rhymes with Jonport. Due to other quality issues with this machine I vowed to NEVER spend another dime with that company. So I needed an outside source for replacement parts) Thanks! ... show more
Reviewed in the United States on September 25, 2024 by Joseph McAfee
    • Purchased for extra depth of focus on curved drinking glasses
Size: Dia:20mm FL:76.2mm/3"
I have some unique glasses that are curved and tapered and I didn't think the standard 2" focal length lense on my laser machine would handle the varying focus depth. I started with a ramp test on this new 3" FL from cnole tech and found the ideal FL was 70 mm from work surface to the bottom flat face of the lense with a great focus in 2mm either direction a total of 4mm variance. I'm impressed with the ability to remain a relatively fine point focus at this FL. The Lense appears to be of high quality and was delivered scratch free with a perfect polish. ... show more
Reviewed in the United States on March 24, 2024 by Christopher
    • Replacement for my OMTech 100W CO2 laser
Size: Dia: 18mm FL:2"/50.8mm
I managed to drop my original OEM lens while cleaning it...don't do that as they are very brittle. OMTech focus lenses were out of stock so I took a chance and just ordered from Amazon. The new lens worked but it seemed like my laser settings needed to change. It needed different settings to properly engrave powder coated stainless steel tumblers from what I had historically used. Not better or worse, just different. I only ran a grid test with power/speed to find a better setting. I never did try a ramp test to see if it was bacause the focal length was slightly different. Overall very happy with this relatively cheap alternative to buying from OMTech. ... show more
Reviewed in the United States on June 25, 2023 by Eric Uptagrafft

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