Fiber laser and CO2 laser are two common types of lasers used in industry for different applications. Both have their unique advantages and disadvantages that should be considered when choosing a laser technology for a specific application.

 

How fiber lasers work

 

A fiber laser works by using an active fiber optic amplifier to generate and amplify laser light. The process begins with a pump source, usually a laser diode, that sends light into an optical fiber. Within the fiber, the light circulates and excites the active atoms or ions doped in the fiber core. As the light passes through the active core, stimulated emission of photons occurs, generating laser light.

 

The amplified laser beam is then directed through a series of mirrors and lenses to focus it to the desired intensity and size. The laser beam can then be used for various applications, such as cutting, marking, or welding materials.

 

How CO2 lasers work

 

A CO2 laser works by using a gas mixture of carbon dioxide, nitrogen and helium to generate laser light. The process begins with a high-voltage discharge that excites the gas mixture in a closed tubular resonator. When the gas is excited by the high-voltage discharge, a cascade of atomic transitions occurs, generating photons.

 

These photons are then reflected between two mirrors, one partially transparent and one completely reflective, creating a resonance in the tube. This results in the photons being amplified and forming a powerful laser beam.

 

The amplified laser beam is then directed through a series of lenses and mirrors to be focused to the desired intensity and size. The CO2 laser beam can be used for a variety of applications, including cutting, engraving, marking and welding materials.

 

How CO2 lasers and fiber lasers differ

 

CO2 lasers and fiber lasers are two different types of lasers used for industrial applications, but they differ in several ways.

 

Light source:

 

– The CO2 laser uses a gas mixture, usually carbon dioxide, to generate laser light.

 

– The fiber laser, on the other hand, uses a solid-state laser where the light is created by the excitation of rare earth elements embedded in a glass fiber.

 

Wavelength:

 

– The CO2 laser has a wavelength of approximately 10,600 nanometers, making it suitable for processing non-metallic materials such as wood, plastic, and ceramics.

 

– The fiber laser has a shorter wavelength of approximately 1,064 nanometers, making it ideal for processing metals such as steel, aluminum, and copper.

 

Efficiency and speed:

 

– The fiber laser is generally faster and more energy-efficient than the CO2 laser, especially when processing metals.

 

– However, the CO2 laser has a higher cutting depth capability for thicker materials.

 

Maintenance:

 

– The fiber laser typically requires less maintenance and has a longer lifespan compared to the CO2 laser, which may require regular adjustment and gas refilling.

 

Cost:

 

– The initial cost of fiber lasers has decreased significantly in recent years, making them more affordable than CO2 lasers for many companies.

 

– Despite this, the CO2 laser can still be a cost-effective option for certain applications and materials.

 

In conclusion, the choice between CO2 laser and fiber laser depends on the specific needs and applications. The fiber laser is usually preferred for processing metals due to its speed, precision, and energy efficiency, while the CO2 laser is still suitable for processing non-metallic materials and some metal applications with deeper cutting requirements.