DIY CO2 laser cutter thin form factor

Design and or Build your Own Laser in part or Whole
Nicolas Raynaud
Posts: 10
Joined: Mon May 17, 2021 8:01 am
Location: Grenoble
Country: France
Laser Machine Make or Type: None
Laser Power: 0
Laser Bed Size: 0x0
Home Position: TL
Control Software: LIGHTBURN
RDWorks Version: 0
Ruida Controller: Other
Windows Version: mac

Re: DIY CO2 laser cutter thin form factor

Post by Nicolas Raynaud »

thank you very much for the information.
Nicolas Raynaud
Posts: 10
Joined: Mon May 17, 2021 8:01 am
Location: Grenoble
Country: France
Laser Machine Make or Type: None
Laser Power: 0
Laser Bed Size: 0x0
Home Position: TL
Control Software: LIGHTBURN
RDWorks Version: 0
Ruida Controller: Other
Windows Version: mac

Re: DIY CO2 laser cutter thin form factor

Post by Nicolas Raynaud »

Hi all,
I started building my laser, and I am thinking of using 4 mirrors for the beam to fold it a bit more than the usual 3 mirrors configuration.
I was wondering why I can't find anyone else doing it, is there a big power penalty?

From looking at vendors sites, mirrors seem to have a high efficiency, I see 99% numbers, is that realistic?

thanks for your help
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Gene Uselman
Posts: 2038
Joined: Thu Jul 07, 2016 3:18 pm
Location: Suburban Minneapolis, Minnesota, US
Country: USA
Nickname: Gene
Laser Machine Make or Type: AKL1318-2
Laser Power: 130W & 80W Reci
Laser Bed Size: 51 x 71
Home Position: TR
Control Software: LIGHTBURN
RDWorks Version: RDw .19 & Lightburn
Ruida Controller: RDC6445
Accessories: I have a combining lenses, pin tables [homebuilt], honeycomb tables , wireless remote, Modifed Ultimate Air Assist, home built non-powered rotary device, Prusa i3 MK3S and Mini Prusa printers.
Windows Version: Win 10 Pro

Re: DIY CO2 laser cutter thin form factor

Post by Gene Uselman »

Mirrors are quite efficient when clean and well adjusted- but in practice are just another power robbing component. If you are using a large wattage tube it will not be a big deal. I have found that the longer the beam length between tube and head, the more divergence of the beam you will have.
On a small bed this is not a problem but when you get to a larger bed it can be troublesome. I am working on a 30mm mirror in the cutting head to help alleviate that problem [ but it presents other problems of course].
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Nicolas Raynaud
Posts: 10
Joined: Mon May 17, 2021 8:01 am
Location: Grenoble
Country: France
Laser Machine Make or Type: None
Laser Power: 0
Laser Bed Size: 0x0
Home Position: TL
Control Software: LIGHTBURN
RDWorks Version: 0
Ruida Controller: Other
Windows Version: mac

Re: DIY CO2 laser cutter thin form factor

Post by Nicolas Raynaud »

thank you. I have a 130W tube, but the bed is about 2m x 1m.

I was thinking of putting the tube on the gantry, but I'm walking back from that, it's too much mass.
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