Fibre Laser vs CO2 Laser: An IPG Photonics Buyer's Checklist

When this checklist is useful

Use this if you are comparing an IPG Photonics fiber laser with a CO2 system, or if you need to justify a laser beside a CNC milling cell. It also applies if you are investigating laser terminology in a medical setting and want to understand why wavelength matters before a consultation. I am not a salesperson. I'm an applications engineer who has handled custom laser integrations for nine years. I've documented eight significant mistakes worth roughly $214,000 in wasted budget. The point of this checklist is not to make every decision look simple. It is to keep the next one from being expensive.

Step 1: Put the work piece before the laser brand

Laser selection starts with material absorption, not with company name. The same IPG Photonics fiber laser that slices mild steel quickly can leave a charred edge on clear acrylic because the 1 micron wavelength behaves differently on that material than a 10.6 micron CO2 beam.

For metals such as steel, stainless, aluminum, copper, and brass, a 1 micron fiber source is often the more efficient choice. For wood, paper, acrylic, and many plastics, 10.6 micron CO2 remains useful. Welding and robotic processing usually favor fiber because the beam comes out of a fiber cable. Marking and cleaning depend more on pulse shape than on the simple fiber vs CO2 label.

In 2017, I chose a high-power fiber laser for a job that was mostly thick acrylic. The demo looked fine. The real sheet produced charred edges. The rework cost about $4,800 plus a missed ship date. That mistake was not the machine's fault. It was my selection process.

Step 2: Find the IPG Photonics logo after you confirm the laser model

If your team searches for the IPG Photonics logo, you may need a clean brand asset for a proposal or machine label. That part is easy. The serious work is to verify the exact model and optical configuration behind the logo.

A logo on the enclosure does not tell you the power at the workpiece. I once approved a system because the printed name was familiar. Later we found that the beam delivery chain was undersized and the effective cutting power was far below the selected IPG Photonics fiber laser specification. The logo was useful; the serial number, output power certificate, and acceptance test were even more useful.

Step 3: Do the fibre laser vs CO2 laser comparison on your parts

Here is the short version of fibre laser vs CO2 laser: fiber is not automatically better and CO2 is not obsolete. They are different wavelengths with different absorption profiles.

For everyday metal cutting, an IPG Photonics fiber laser usually wins on efficiency, floor space, and running cost. There is no gas resonator to align and no set of mirrors along the beam path. For non-metal cutting, CO2 can remain the better answer because many organic materials absorb 10.6 microns strongly. Clear acrylic is the classic example.

So choose based on the part mix. If you process 95% metal sheet, put the fiber source at the top of the list. If the product is mostly wood, paper, or acrylic, do not let a familiar brand stop you from considering CO2. I do not sell lasers, so I do not have to protect a product line.

Step 4: Put a number on total cost, not just the quote

Purchase price is the first layer. Total cost includes installation, floor space, electrical power, chilled water or air, consumables, tooling, spare parts, operator training, scrap, service response, and downtime. The lowest quote can become the highest total cost when production stops.

I once chose a gas laser system because the initial quote was about $12,000 lower than the fiber alternative. The operating cost erased the saving in eleven months. The gas system consumed more electricity, needed more maintenance, and cut the stainless parts slower. If I had built a 36-month total cost model, fiber would have won.

The most expensive laser is the one that is down when an order is due.

Do not let a supplier hand-wave the service line. Ask for a spare-part price list, recommended preventive maintenance schedule, and documented response time. Write the numbers in the spreadsheet before you compare proposals.

Step 5: Plan the CNC milling application in the same process sequence

Here is the operational mistake I see when people are new to laser processing: they assume fiber laser and CNC milling are in competition. They are not. In a CNC milling application, the mill usually makes the 3D features—pockets, slots, threads, datums—while the laser cuts, welds, marks, or cleans the surrounding geometry.

Sequence matters. I produced 60 laser-cut blanks for a part that later needed a milled pocket. I did not add a machining allowance to the blank because I assumed laser accuracy was unlimited. The mill datum shifted from blank to blank, and we lost a day correcting the program. It was not an application failure; it was a tolerance-chain failure.

Write the process route first. If the laser comes before the mill, add stock and decide whether the laser edge can be a locating edge. If the mill comes before the laser, protect the machined surfaces from weld splatter or marking residue.

Step 6: Make acceptance testing part of the purchasing contract

Before you announce a winner, run an acceptance test on real parts. The test should include your material grades, your thickness range, your typical part size, and your acceptable cycle time. The supplier's demo video is not a technical document.

• Cut or weld your material in a workholding arrangement similar to actual production.
• Run at least 20 parts and measure critical dimensions.
• Check edge condition at the start, middle, and end of the run.
• Record assist-gas type, pressure, and consumption.
• Measure or request the laser power at the processing head, not just at the source output.

I found an intermittent penetration problem during a 2022 acceptance run on 12 mm steel. The laser source showed full power, but the protection window in the cutting head was dirty and absorbed part of the beam. Replacing the window fixed the problem. The lesson: source power is a report; process power is the actual result.

Watch-outs from the mistakes file

These are not exotic failures. I still see them in post-project reviews:

• Comparing a pulsed fiber laser's peak power with a CO2 laser's average power. Use one continuous metric.
• Forgetting that assist gas is a recurring expense. Nitrogen can add up quickly.
• Ordering spare optics after production starts. Lead times turn a small repair into long downtime.
• Building the laser safety enclosure too late in the project.
• Believing that fiber lasers need zero maintenance. They need less maintenance than gas lasers, but they are not maintenance-free.

If a sales rep says 'no maintenance,' ask for the written plan. I have yet to see a laser installation that ran forever without cleaning a lens, replacing a protection window, or changing chiller water.

A boundary note: CO2 laser treatment on legs

This article is about industrial equipment, but I want to address one search phrase clearly: CO2 laser treatment on legs. That gets into clinical territory, which is outside my expertise. I am not a dermatologist or vascular specialist, so I cannot tell you whether CO2 is the right wavelength for a specific leg condition.

What I can say from an engineering perspective is the same message in every step of this checklist: wavelength, tissue absorption, pulse duration, and operator training determine the result. In a medical setting, those decisions should be made by a qualified clinician. Ask which laser wavelength is used, which pulse parameters are planned, and what evidence supports the procedure. A brand logo is not a treatment plan.

My own experience is limited to roughly 70 industrial laser integrations. I have not worked on human tissue, and this is the boundary of my checklist. If you are researching laser treatment for yourself, talk to a clinician. That is the one step I will not cut.