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Focusing Lens for Fiber Laser Cutting Machine

Laser focusing lens is an essential optical element in the laser system. It plays a key role in concentrating and controlling the intense energy of the laser beam to a specific point called the focus. This process, called laser focusing, is critical for many applications, from precise material cutting to engraving.

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Product Description

Product Overview

A focusing mirror is a special optical element that is responsible for concentrating the energy of the laser beam into a small focal area. At the focal point, the energy density of the laser is extremely high, which allows processes such as cutting and engraving to be performed at very fast speeds and with high precision.

Working principle of focusing mirror

Beam focusing: When the laser beam passes through the focusing mirror, the lens refracts the light to form a focal point. This focal point is usually only a few microns in diameter, and its energy is highly concentrated here, which can achieve cutting of materials.

Focal length: The focal length of the focusing mirror determines the focusing effect of the laser. A mirror with a short focal length can produce a smaller focal point to achieve a higher energy density, but may limit the depth of cutting; while a long focal length is suitable for cutting thicker materials.

Main Functions of Focusing Lens

1. Concentrate energy: The focusing mirror concentrates the energy of the laser beam to a small focal point, thereby improving the processing efficiency of the laser system. At the focal point, the energy density is extremely high, and a variety of materials can be easily cut.

2. Control the spot size: By adjusting the parameters of the focusing mirror, the size and shape of the focus can be controlled, which is crucial for handling cutting needs of different materials and thicknesses.

3. Improve cutting quality: Correct focusing can reduce the heat-affected zone and deformation during the cutting process, and improve the smoothness and precision of the cutting edge.

Features of Focusing Lens

1. High energy density focusing:

The focusing mirror can focus the laser beam to a very small focal point, thereby generating high energy density, which is suitable for efficient cutting.

2. Material diversity:

The focusing mirror is usually made of synthetic quartz or high-quality optical glass, which can meet the application of different needs and laser wavelengths.

3. Usually a convex lens structure:

Most focusing mirrors are designed as convex lenses, which realize the focusing of lasers through the principle of refraction. The structure is simple and easy to manufacture.

4. Different focal length options:

According to the cutting requirements, the focusing mirror has a variety of focal lengths to choose from to meet the processing of materials of different thicknesses.

5. High optical quality:

High-quality focusing mirrors have excellent optical performance, which can effectively reduce the aberration of the beam and ensure efficient transmission of the laser.

Types and Materials of Focusing Lens

1. Types of focusing mirrors

Planar mirrors: Mostly used for simple laser systems, with a more general focusing effect of the beam.

Convex lens: the most common focusing mirror, through the curvature of the laser beam will be effectively focused, suitable for most laser cutting and engraving applications.

Aspherical mirror: can realize more complex beam shaping, suitable for high-precision requirements of the application scenario.

2. Focusing mirror materials

Optical glass: suitable for low power laser system, lower cost, but poor heat resistance.

Synthetic quartz: widely used in high power laser cutting, with high transmittance and heat resistance.

Advantages of Focusing Lens

1. High cutting speed:

Due to the extremely high laser energy density after focusing, the cutting speed can be greatly increased to meet the needs of industrial production.

2. Cutting precision:

Through high-precision focusing, it is possible to realize detailed cutting effects with smooth cutting edges, reducing the need for subsequent processing.

3. Strong adaptability:

The focusing mirror is suitable for a variety of materials, such as metal, non-metal, composite materials, etc., widely used in different fields.

4. Low maintenance cost:

Focusing mirrors are generally wear-resistant and durable, and maintenance is relatively simple, regular cleaning can effectively extend the service life and reduce the total cost of ownership.

5. Small heat-affected zone:

The high energy generated by focusing mirrors reduces the heat-affected zone, thus minimizing material deformation and maintaining the geometric accuracy of the workpiece.

6. Good beam quality:

Optimize the quality of the laser beam through high-quality optical components to enhance the overall effect of cutting, etching and other processes.

With its high energy efficiency, cutting precision and adaptability, the focusing mirror of fiber laser cutting machine has become a core component in modern laser processing technology, promoting the automation and high efficiency of manufacturing.

Selection of Focusing Lens

Laser cutting machines with different powers require focusing lenses with different focal lengths

The principle of the focusing mirror is similar to that of the collimating mirror, but its convex surface faces in the opposite direction. There are many models of focusing lenses. Common focal lengths include 125 J, 150 J, 200 J, 250 J, 300 J and 350 J.

● 3000W laser cutting machine: 125 J and 150 J are available;

● 6000W laser cutting machine: 150 J and 200 J are available;

● 20,000W laser cutting machine: 200 J and 300 J are available;

● 40,000W and 50,000W laser cutting machines: 300 J and 350 J are available.

The longer the focal length, the higher the verticality of the laser, the fewer burrs during air cutting, and the easier it is to perforate thick plates. However, too long a focal length can also result in slower sheet cutting speeds.

Application of Focusing Lens

Laser focusing lenses have been used in a variety of applications. These applications typically include:

● laser cutting

In an industrial setting, the focusing lens is part of the laser cutting machine. It helps the laser cutter focus the laser beam onto a small area of the material. Therefore, it will provide a more precise and controlled cut. The intense energy at the focal point then vaporizes or melts the material.

● laser engraving

Laser engraving involves using a focused laser beam to remove material from a surface, creating intricate designs, text or patterns. Focused lens ensures fine detail and accuracy.

● Laser Marking

Laser focusing lenses are critical in this process, concentrating the energy of the laser beam into a small focus, allowing for precise and controlled material removal or alteration. Laser focusing lenses help create a small, intense focus on the surface of the material. This precision ensures clear, well-defined markings and accurate positioning.

After using the original laser cutting machine focusing lens for a long time during the cutting process, if there are dents, film falling, scratches, etc., the cutting function of the laser equipment will be greatly reduced. If you want to perform the functions of the laser cutting machine normally, you need to replace the new focusing lens in time.

Installation Method of Focusing Lens

Correct installation method of focusing lens of laser cutting machine:

1. Place the protective film of the laser cutting machine focusing lens in the palm of your hand with the convex side of the lens facing up.

2. Pick up the focusing tube and carefully place it in your hand where the lens is, covering the entire lens.

3. Rotate the left and right hands 180 degrees clockwise at the same time.

4. After releasing the lens, use a small steel ruler to tighten the lens nut.

5. Install the jet cup on the focusing tube of the laser cutting machine.

Use and Maintenance

Regular cleaning: The surface of the focusing mirror is prone to dust accumulation, so it should be cleaned regularly to ensure light transmittance and focusing effect.

Check for wear: Check the focusing mirror frequently for scratches or wear, and replace it if necessary.

Pay attention to protection: During the laser cutting process, avoid contact between the focusing mirror and other objects to prevent damage.