Fiber laser marking machines focus the laser beam into a spot

The most widely adopted marking machine on the market today is likely the fiber laser marking machine, which excels at marking both metallic and non-metallic materials.

Fiber lasers offer the following advantages for laser marking applications:

1. The fiber laser beam is exceptionally well-collimated, approaching the diffraction limit. It outputs in the TEM₀₀ fundamental mode with an M² value close to 1, and a beam divergence of 0.24 mrad;

2. Fiber lasers feature high pulse repetition rates and stable output power, with single-pulse energy fluctuations below 1%. This enables high-speed laser marking while allowing precise control over spot size, depth, and shape;

3. Fiber lasers exhibit high efficiency, with overall efficiency reaching 20% and electro-optical conversion efficiency up to 70%.

4. Fiber lasers demonstrate strong environmental adaptability, capable of continuous, stable operation in high-vibration and high-humidity conditions.

5. Low-power fiber lasers require no water cooling systems, feature compact size, high efficiency, and high reliability, enabling long-term maintenance-free operation and reduced operating costs.

Fiber laser controllers primarily regulate pulse duration and frequency, while marking machines control laser output via computer. The galvanometer system, a critical component of fiber laser marking systems, directs the laser beam through mirror movement to etch specific character trajectories onto target components. The f-lens focuses the laser beam onto the workpiece surface. Within the galvanometer system workflow, two high-precision servo-driven mirrors are positioned internally. Controlled by a microcomputer, voice coil motors adjust the angular positions of these mirrors. The laser beam reflects off both mirrors and is focused by the f-field lens onto different locations on the workpiece. Using specialized marking control software on a computer, input the text and patterns to be engraved, set their size, the total marking area, the laser beam's travel speed, and the required number of repetitions. Under computer control, the galvanometer moves to perform the marking, directing the laser beam to engrave the specified text, patterns, and characters onto the workpiece.

The computer-specific marking software can recognize and process any complex two-dimensional images, graphics, text, QR codes, and barcodes—whether captured via digital camera or scanner, downloaded from the internet, or created locally. It converts these into digital signals, which are then programmed and transformed into electrical control signals for the driver. These signals activate the D/A card to control high-precision servo motors, precisely directing the mirrors' deflection along the X and Y axes. The deflection angle of the galvanometer mirrors directs the laser beam's focused spot to trace the predefined pattern or text trajectory, etching permanent marks onto the workpiece surface. Line widths as fine as 20 micrometers can be achieved, and the software features automatic image distortion correction for precise image marking. This is the fiber laser marking machine.

For more information about laser marking machines, laser welding machines, and laser cutting machines, please visit the official website of Wuxi Top Optics Laser Technology Co., Ltd.: http://www.tollaser.com