UV Laser Marker for Ultra-Fine Marking and Engraving

In today's rapidly evolving industrial production environment, product manufacturers often face the challenge of transforming designers' creative ideas into actual products. To ensure that the product appearance is sufficiently attractive, it is often necessary to present various patterns and texts on the product surface. This processing technology is known as "marking." Currently, most products use lasers for surface marking or engraving, and ultraviolet (UV) laser marking machines are an important member of the laser marking machine family.

Compared to fiber or CO2 lasers, UV lasers have unique advantages. They support an extremely wide range of materials and can process almost any material, covering many everyday products. Materials such as plastics, silicone, glass, jade, ceramics, acrylic, and even ordinary leaves can all be processed by UV lasers.

UV lasers belong to the category of short-wave cold lasers, with extremely fine laser beams and superior beam quality. When marking heat-sensitive packaging bags or plastic bottles in production workshops, they do not cause surface deformation or discoloration due to thermal effects. Whether your needs involve common product marking processes, such as text, patterns, QR codes, serial numbers, anti-counterfeiting codes, or intricate three-dimensional patterns engraved inside glass, UV laser marking machines can tailor the best solution for you. For professionals in related industries, UV laser marking machines are like versatile and reliable assistants, helping you perfectly transform any creative idea into reality.

What is a UV Laser Marking Machine?

A UV laser marking machine utilizes ultraviolet laser beams to create permanent marks on the surfaces of various materials. It employs a cold laser processing technique, where short-wavelength UV lasers directly break the chemical bonds within the material molecules, causing the material to undergo changes and display corresponding text or patterns at the processed locations.

The reason UV laser processing is referred to as cold processing is that UV photons possess higher energy. These high-energy photons directly ionize the atoms of the material being processed, breaking the chemical bonds between molecules and disrupting the original material structure. This process is known as the photochemical ablation effect. The photon energy is primarily used to excite electron transitions within the material, triggering photochemical reactions or phenomena such as fluorescence. The energy contributing to the thermal motion of molecules is relatively small, and due to its poor penetration, it is difficult for the laser to reach deep inside the material. As a result, this working method generates very little heat, and the inner layers and nearby areas of the material hardly experience deformation or discoloration due to heat. The processed products feature smooth edges and minimal carbonization.

UV laser marking machines can achieve high-resolution marking while offering excellent processing quality and speed. Additionally, they effectively avoid laser burn marks caused by thermal effects, reducing damage to the material. They play an irreplaceable role in processing sensitive materials such as food packaging and electronic components.

Working Principle of UV Laser Marking Machine

A UV laser marking machine is a device that uses UV laser for non-contact, high-precision processing of products. Its working principle involves multiple technical steps, including laser generation, laser control, and laser interaction.

The device is powered by a laser power supply, which converts electrical energy into light energy through a diode-pumped solid-state laser. The light energy enters a crystal containing a gain medium, creating a population inversion and generating stimulated radiation. This radiation is reflected and amplified multiple times within an optical resonator composed of mirrors, forming a coherent laser beam. The initial laser wavelength produced is 1064nm, which is then frequency-tripled to the third harmonic through intracavity frequency tripling technology, ultimately outputting a 355nm UV laser. The laser enters the galvanometer scanning system, where the control system digitizes the intended marking pattern into corresponding coordinates and paths. The system then precisely controls the deflection of the XY-axis mirrors via motors, guiding the laser beam to change its path. Finally, the laser is focused onto the workpiece surface through a field lens, interacting with the workpiece to create fine markings.

Components of a UV Laser Marking Machine

Laser Generator

Utilizes a solid-state UV laser with a sealed integrated design, combining the optical path and external drive circuit into one unit. This design provides strong anti-interference capabilities and effectively prevents dust ingress. Most UV laser marking machines use DPSS (Diode-Pumped Solid-State) UV lasers. The core technology involves third-harmonic generation through intracavity frequency tripling, converting infrared laser into UV laser with a central wavelength of 355nm.

Galvanometer Scanning System

Primarily consists of motors, mirrors, control circuits, and sensors. The control system generates corresponding signals based on the marking pattern. These signals are transmitted through the control circuit to drive the X-axis and Y-axis motors, which precisely rotate the attached mirrors to alter the reflection path of the laser beam. This ensures the laser moves along the predetermined trajectory on the workpiece surface.

Field Lens

Uses a specialized 355nm ultraviolet laser field lens, available in two types: F-θ lenses and telecentric lenses. F-θ lenses are more common, while telecentric lenses are less frequently used due to their higher cost. The field lens corrects and focuses the deflected laser beam from the galvanometer, concentrating the laser energy to achieve a more uniform focal spot and ensuring consistent spot diameter within the processing range. The focal length of the field lens affects the processing range: shorter focal lengths result in smaller processing areas, while longer focal lengths enable larger processing areas.

Control System

Divided into hardware and software components. Operators can import design files or edit patterns through the software and set marking parameters. The hardware component receives digital command signals from the software and coordinates the operation of other hardware components.

Cooling System

Since the laser generator of a UV laser marking machine generates significant heat during operation, a water cooling system is commonly used for cooling. The water cooling system circulates cooling water to dissipate the heat produced by the laser generator and maintains a constant water temperature through temperature control technology, ensuring stable laser operation.

Applications of UV Laser Marking Machines

The wavelength of UV laser is easily absorbed by various materials, especially high-molecular materials and heat-sensitive materials. Therefore, its processing range covers more than 95% of materials, earning it the title of "universal laser."

• Metal materials: Carbon steel, iron, stainless steel, aluminum, titanium, copper, gold, silver, platinum, magnesium alloy, nickel alloy, tungsten alloy, titanium alloy, zinc alloy, and coated metals, etc.
• Non-metal materials: Glass, PE, PVC, PP, PC, acrylic, ceramics, silicone, plastic, PCB, FPC, film, crystal, paper, foam, leather, wood, MDF, fabric, stone, resin, sapphire, LCD, ABS, plywood, rubber, carbon fiber, gallium nitride, silicon carbide, graphene, bone, bamboo, eggshell, leaves, etc.

Features of UV Laser Marking Machines

• The UV laser marking machine has excellent beam quality, with an extremely small focused spot. The marked lines are fine, clear, wear-resistant, and durable.
• Equipped with high-speed scanning galvanometers, the line speed can reach up to 7000mm per second, ensuring very fast marking speeds and significantly improving production efficiency.
• It has a wide range of material compatibility, suitable for marking and engraving on various materials, including metals, non-metals, polymers, glass, etc.
• It belongs to cold processing, with a minimal heat-affected zone, preventing material burning, deformation, or discoloration, making it particularly suitable for heat-sensitive materials.
• By adjusting laser parameters, black or white marks can be achieved on certain specific material surfaces.
• It requires only electricity to operate, with no need for other consumables, resulting in low usage costs.
• The processing generates no toxic substances, dust, or chemical pollution, meeting environmental requirements.
• The laser has a long lifespan, high electro-optical conversion efficiency, and low energy consumption, making it more economical for long-term use.
• The machine features a compact design with a small footprint, allowing it to be placed in various environments. It can be integrated with various production lines to achieve automated marking in a production line setup.
• It uses a recirculating water cooling system, providing better cooling performance and enabling 24-hour continuous operation.
• The software supports multiple languages, has a user-friendly interface, and can automatically optimize processing paths to reduce marking time. It supports a wide range of file formats and is compatible with various bitmap and vector files.
• The operation is simple, just import the design file to start fully automated processing. It has no learning curve and can be mastered in just five minutes.

What is an Ultraviolet Laser Glass Internal Marking Machine?

An ultraviolet laser glass internal marking machine, also known as a 3D internal engraving machine, uses ultraviolet laser beams to create 3D engravings of patterns or designs inside crystal or glass.

This technology is referred to as Sub-surface Laser Engraving (SSLE). The principle involves directing the laser through the interior of the glass or crystal and focusing it at specified internal locations. When the laser energy exceeds a certain threshold, it causes microscopic structural fractures inside the glass, forming tiny bubbles. The laser scans at an extremely high frequency in a controlled manner, creating countless densely packed small bubbles inside the glass. These bubbles are arranged in an orderly fashion according to the preset path, thereby displaying the intended 3D pattern. This technology is commonly applied in products such as glass curtain walls, transparent automotive glass interiors, crystal-engraved portraits, glass-engraved anime characters, engraved liquor bottles, engraved wine glasses, lighting fixtures, transparent phone cases, and more.

How Does a UV Laser Marking Machine Achieve Black or White Marking?

By adjusting the parameters of the UV laser marking machine, black and white markings can be achieved on certain specific materials. For example, when processing stainless steel materials, black or white oxide layers can be generated on the surface by adjusting parameters such as pattern fill spacing, laser power, marking speed, and frequency, enabling black and white markings. When marking white plastics, selective carbonization of the lower layer of the plastic surface can be achieved by adjusting the parameters, resulting in black markings. During marking, energy is confined to a very small area, creating a sharp contrast between the marked content and the background material, making it easy to identify.

Engraving Leaves By UV Laser Marking Machine

Using a UV laser marking machine, you can engrave portraits, photos, pets, or animal images on leaves and grass blades for creating crafts, souvenirs, and bookmarks.

Among fiber lasers, CO2 lasers, and UV lasers, only UV lasers are suitable for engraving leaves. This is because fiber lasers and CO2 lasers have strong thermal effects, and the high temperatures applied to the material during marking can easily damage the leaf structure. In contrast, UV lasers are short-wavelength cold light sources that do not rely on thermal effects to ablate the leaves at high temperatures. Instead, they use photochemical reactions to break molecular chains for processing, thereby avoiding charring or thermal deformation of the leaves caused by processing.

Optional Accessories for UV Laser Marking Machines

UV laser marking machines offer a wide range of optional functional expansion components. When selecting accessories, consider factors such as material type, processing precision, and efficiency.

Adding a one-dimensional, two-dimensional, or three-dimensional flat worktable can expand the size of the products being processed.Choosing a 3D rotary axis or a small ring rotary axis allows for processing various three-dimensional workpieces, such as bracelets, rings, cans, and vases.You can also opt for a CCD vision positioning system and conveyor belt to integrate with high-speed production lines, enabling automatic recognition of product contours for batch marking, such as on plastic bottles, bottle caps, and food packaging production lines.Additionally, the machine's structural design comes in various forms, including portable, desktop, integrated, cabinet-type, enclosed, and flying-type. You can flexibly choose based on your actual usage scenarios.

Specification of UV Laser Marking Machine

Price of UV Laser Marking Machines

In 2025, the price of UV laser marking machines has become relatively more affordable. The overall price of the machine is influenced by factors such as laser power, brand, processing size, and functionality.

The price of an entry-level 3W portable UV laser marking machine starts at just $1,950. Machines suitable for glass and crystal start at $4,900, while flying-type UV laser marking machines for industrial production lines start at $2,500. Adding a two-dimensional worktable increases the price by $100; upgrading the laser head from manual lifting to electric lifting adds $70, and purchasing an additional field lens with a different scanning size increases the price by $100.

When making a purchase, you should also consider practical needs, applicability, long-term reliability, supplier strength, and after-sales service. Avoid blindly pursuing the lowest price or the highest configuration. Machines with extremely low prices might save costs initially, but the use of cheap components could lead to malfunctions later, resulting in additional time and monetary costs. Additionally, you need to account for expenses such as shipping fees and taxes when purchasing the machine.

Steps for Using a UV Laser Marking Machine

The use of a UV laser marking machine is relatively simple compared to other CNC-type machines, requiring no complex operations or preparation work. Below are the steps for operating a UV laser marking machine for your reference.

1. Preparation: Prepare the material to be processed and ensure the laser marking workbench is clean. Turn on the machine power, computer power, and water chiller power. Check the water chiller temperature to ensure it is within the working range. Connect the marking machine to the computer via a USB cable.
2. Parameter setting: Open the laser marking control software on the computer and select the drawing file to be used. Set appropriate laser power, marking speed, and frequency based on the size, material, and desired engraving effect of the material. (Note: Before actual processing, it is recommended to conduct some tests using scrap material to determine the optimal processing parameters to ensure ideal results.)
3. Material fixation: Place the material flat on the marking machine's work platform. Use appropriate clamps or fixtures to secure the material to prevent movement or deformation during the engraving process.
4. Processing preview: Select the red light positioning and confirm the processing position is correct through the indication of the red light preview frame.
5. Start processing: During the processing, closely observe the state of the product and the processing effect to ensure the laser accurately processes the desired pattern or text.

Note: Due to the different characteristics of various materials, parameter adjustments and optimizations are necessary before marking. Always pay attention to safety during operation to avoid laser harm to the human body and surrounding environment.

Maintenance of UV Laser Marking Machine

The maintenance of a UV laser marking machine should be carried out from two aspects: daily maintenance and regular maintenance. Below are the detailed maintenance methods and steps summarized by CATEKCNC's laser marking machine engineers.

Daily Maintenance:

• Check the field lens daily to avoid dust or foreign objects on the surface affecting processing. If there is dust or foreign matter, use special lens cleaning paper or anhydrous alcohol for cleaning.
• Check the water chiller temperature and the flow of cooling water pipes for blockages before daily operation.
• Check the laser's power, frequency, and other parameters before processing to ensure stable marking effects.
• Clean the workbench surface after processing to avoid accumulation of foreign objects or debris.

Regular Maintenance:

• Regularly clean the dust inside the machine control cabinet using compressed air.
• Regularly clean the galvanometer, field lens, workbench, and ventilation ports.
• Regularly check the power lines and contacts to ensure all electrical components are operating normally.
• Regularly check the water chiller coolant level and quality, replace the circulating water regularly, and clean the tank impurities. Add antifreeze in winter or cold weather to prevent freezing.
• Regularly apply lubricating oil to the lifting parts.