Laser cutting is a technology that uses a laser to cut or drill material. The process can be used to cut various materials, including metal, wood, plastics, and textiles. Laser cutting is helpful in manufacturing applications where a high degree of accuracy is required. For example, it can create intricate patterns or shapes in metal parts that would be difficult to produce using traditional methods. So, how does laser cutting work?

How Laser Cutting Works

A laser machine being used to cut a material

The laser cutting process starts with your idea. Once you've developed it, you can use CorelDRAW to prepare the graphic or any other 2D software and send the data to the laser. The laser cutter generates a high-powered laser beam directed on to the material using the laser head. The beam then melts, vaporizes, or burns through the material, depending on the laser's power and the material's properties.

The laser usually uses a motion control system or a unique programming system called G-code to control the laser's movements. The G-code gives the laser instructions, for example, where to move and how much power to use, which allows it to cut through material very precisely. For example, a G-code file might tell the laser to move across a piece of wood in a straight line, making thousands of tiny cuts along the way. Find out how to prepare a G-code file.

The process will create a precise and clean cut with no burns or scorch marks. The finished product is removed from the machine once the cutting is complete and the material cooled, with no need for reworking the material. Laser cutting is an accurate and versatile method for creating everything from small parts to complex components.

Applications of Laser Cutting

In the modern world, laser cutters are an extremely useful technology. Here are eight examples of industries where laser cutting can be used:

  • Automotive manufacturing: It helps create car parts and components with high precision.
  • Aerospace manufacturing: Often used to create aircraft parts due to their accuracy and efficiency.
  • Medical devices: Frequently used in the medical field for devices such as pacemakers and stents.
  • Electronics manufacturing: Laser cutters create circuit boards and other electronic components.
  • Food processing: These machines are increasingly used in the food industry for tasks such as slicing and dicing.
  • Textile manufacturing: Often used to create patterns and shapes in the fabric.
  • Glass cutting: It can be used to create intricate designs in glass.
  • Woodworking: You can use laser cutters to create detailed patterns and shapes in wood.

The Main Categories of Lasers

Here are the three of the most popular types of lasers used in various industries today:

1. CO₂ Lasers

CO2 laser in action
Image credit: Maker'sMuse/YouTube

C0₂ lasers utilize carbon dioxide and, to some extent, nitrogen to improve the effectiveness of light lasers. These lasers use a tube with gas inside where high electricity exerts pressure on the gas particles, producing a beam of high-power infrared light (laser beam). The tube is shown below.

A laser beam tube with gas sealed inside
Image credit: Further Fabrication/YouTube

The laser beam is bounced back and forth between the mirrors inside the laser machine to the nozzle and then finally to the work area, as shown below.

Laser beam bouncing between two mirrors before being directed to the laser head
Image credit: Further Fabrication/YouTube

The back and forward movement of the laser based on the specified instructions in the computer ensures the cutting of the material as required. You can use CO₂ lasers to cut materials like wood, plastic, plywood, rubber, leather, paper, and fabric. These lasers cannot cut other materials like glass and stone; however, they can engrave on them.

2. YAG lasers

YAG laser cutter being used to drill holes in a metal
Image credit: Qpage/YouTube

These solid-state lasers use an yttrium-aluminum-garnet (YAG) crystal as the active medium. An external energy source like an electrical current stimulates the electrons in the crystal, producing the laser light. The YAG contains two reflecting mirrors, m1 and m2, attached to the end, as shown below.

Two mirrors, power supply, and flash tube in a YAG laser cutter
Image credit: Qpage/YouTube

A krypton lamp or xenon flash is used to pump the signals from m1 to output through m2. The flashlight excites ions from the power source attached below the mirrors to high energy levels. As energy transition occurs, the photon beam is generated for laser cutting.

YAG lasers are usually used for drilling purposes on materials like metal. They are distinguished from other types by their high efficiency and stability. They are also resistant to heat and humidity damage, making them ideal for use in industrial settings.

3. Fiber Lasers

A hand touching the fiber laser button
Image credit: Beaded Builds Co/YouTube

Fiber lasers are primarily used for laser engraving projects and not explicitly for cutting. However, you can use them for cutting thin metals, usually after several passes. These lasers create beams using active optic fiber, which are then transmitted to the cutting head. They can cut stainless steel and aluminum and are well known for their excellent electrical efficiency and low operating costs.

Advantages of Laser Cutting

Laser cutting is a popular method for creating intricate designs and shapes in various materials. Here are seven advantages of laser cutting:

  • High precision: Lasers can cut through materials with fine detail and accuracy.
  • Speed: Laser systems can cut through material quickly, making them ideal for high-production environments.
  • Versatility: This technique can cut through various materials, including wood, metal, glass, and plastic.
  • Clean process: Laser systems create little or no waste material compared to other methods such as machining or stamping.
  • Computer controlled: This means that one can create complex shapes and designs with ease.
  • Cost-effective: Laser systems require little maintenance, and you can use them in multiple projects.
  • Laser cutting is fun: Watching a laser cut through material like butter is satisfying. Whether you're an experienced operator or just getting started, laser cutting can be an enjoyable experience.

Disadvantages of Laser Cutting

A man holding a paper catching fire after being exposed to a laser cutter
Image credit: Make or Break Shop/YouTube

Laser cutting is not without its disadvantages. Here are six of them:

  • Fire risk: The light emitted by laser cutters can generate extremely high temperatures that could ignite a fire in flammable materials.
  • Can be expensive: The initial investment in a laser cutter can be pretty high, and the operating costs (such as power consumption) can also add up.
  • Requires a fair amount of maintenance: The mirrors and lenses need to be kept clean and aligned, and operators must regularly calibrate the whole system.
  • Produces hazardous fumes and dust: These need to be correctly extracted from the workspace to protect the operators and the equipment.
  • Can be a slow process. It can take a long time to cut through thicker materials, and the material's properties often limit the cutting speed.
  • It can take time to master: There is a lot to know about the different settings and how they affect the cut, and it can take some time to become proficient at using a laser cutter.

Anyone who would like to invest in a laser cutter must consider these disadvantages. However, the advantages outweigh them for many applications. With proper care and maintenance, a laser cutter can provide years of trouble-free service.

Cut Through Materials With Precision

As we have examined, laser cutting is an interesting technology, and its future is looking bright. With the advancement in technology, this cutting method will continue to become more powerful and precise. Most laser cutters can cut through materials like metal with high precision. And as it continues to become more popular, the demand for skilled workers is increasing. Those trained in operating laser cutters will be in high demand; hence this is an excellent opportunity to get into this exciting technology.