What is the difference between different types of lasers, CO2 lasers vs fiber lasers?
CO2 lasers and fiber lasers are two common laser types used in laser cutting machines. These two types of lasers differ in their core principles, applicable materials, efficiency, and maintenance. Let’s take a closer look at how CO2 lasers compare to fiber lasers:
1. Laser Source Principle
CO2 Laser:
Working Principle: The medium used in CO2 lasers is carbon dioxide gas. When high voltage is applied to this gas, it produces a powerful infrared laser with a wavelength of 10.6 micrometers.
Laser Wavelength: The wavelength of CO2 lasers is longer at 10.6 micrometers.
Features: CO2 lasers have a relatively high electro-optical conversion efficiency and are perfect for cutting non-metallic materials like wood, plastics, leather, etc.
Fiber Laser:
Working Principle: Fiber lasers amplify the laser through rare-earth elements (making ytterbium), and that laser beam is amplified and sent down the optical fiber to produce a laser wavelength of close to 1.06 micrometers.
Laser Wavelength: Fiber lasers have a shorter wavelength close to 1.06 micrometers.
Features: Fiber lasers have better beam quality and better concentrated energy, making them well suited for high-precision metal processing, especially thin metal cutting and drilling.
2. Applicable Materials
CO2 Laser:
CO2 lasers work well with non-metallic materials such as wood, paper, plastic, glass, acrylics, leather, etc.
They are not that effective when cutting thick metal materials.
They are good for applications needing lower power and large area processing.
Fiber Laser:
Fiber lasers are great for cutting metal materials in general like stainless steel, carbon steel, aluminum, copper, brass.
They are great for cutting thinner metals with very good precision.
Because of the shorter wavelength, fiber lasers are better at cutting things that reflect very well like aluminum and copper.
3. Efficiency and Energy Consumption
CO2 Laser:
CO2 lasers are less energy efficient because usually, the electro-optical conversion ratio is around 10% to 15%.
CO2 lasers are larger and require more power which results in higher energy costs.
Fiber Laser:
Fiber lasers are much more efficient when it comes to energy because the electro-optical conversion efficiency is much higher (often over 30%), which reduces their operating costs.
Fiber lasers are smaller in size, require less cooling, and usually have less maintenance, making them more efficient overall.
4. Cutting Speed and Precision
CO2 Laser:
You can cut thicker non-metallic materials well with CO2 lasers, especially when you are talking engraving and cutting larger areas.
When compared to fiber lasers, CO2 lasers cutting metal, especially thin metals, are slower and less precise.
Fiber Laser:
Fiber lasers are really fast when it comes to cutting metal, especially thin metals. They are very precise.
Because of their tiny focus point, they are much better at cutting intricate designs and things that require high precision when cutting metal.
5. Maintenance and Lifespan
CO2 Laser:
CO2 lasers have moving parts and mirrors that make the systems more complex and that require more maintenance.
CO2 lasers typically have shorter lifespans, and depending on the specific laser type that you choose, often, you have to periodically refill or replace the gas medium that makes the laser run.
Fiber Laser:
Fiber lasers are much simpler in design and don’t have moving mirrors or complex moving pieces, so they require much less maintenance.
Fiber lasers have much longer lifespans, often up to 100,000 hours of use or more.
Summary:
| Feature | CO2 Laser | Fiber Laser |
| Laser Wavelength | 10.6 micrometers | 1.06 micrometers |
| Applicable Materials | Non-metals (wood, plastics, etc.) | Metals (stainless steel, carbon steel, aluminum, etc.) |
| Energy Efficiency | Low (10%-15%) | High (30% or more) |
| Cutting Speed | Slower on thick materials | Faster on thin metals |
| Maintenance Needs | High | Low |
| Lifespan | Shorter | Longer |
In conclusion, CO2 lasers are best for cutting non-metal materials and large-area applications, while fiber lasers are more suitable for high-precision, low-energy metal processing.
