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Laser Focusing Lens

It is made of high quality quartz material with high transmittance and high anti-laser damage threshold. The focusing mirror focuses the beam and produces a high energy density focus on the working material for processing, which is widely used in laser cutting machine, laser welding, laser cladding, etc. It occupies a very important position in the laser system, and the change of laser light path is achieved by the refraction of the lens.

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Product Description

Product Introduction

Laser technology plays an increasingly important role in modern industry. With its high energy density, accuracy and non-contact processing characteristics, it is widely used in cutting, welding, engraving and measurement and other fields. The highly concentrated and directional characteristics of laser enable it to achieve unprecedented efficiency and precision in industries such as manufacturing, medical, military and scientific research, promoting technological progress and productivity improvement.

In the laser system, the core role of the laser focusing lens cannot be ignored. These lenses refract and focus the laser beam, concentrating its energy onto a small area, allowing for efficient processing and precise operation. Whether it is laser cutting metal or medical laser treatment, focusing lenses can ensure the effective use of laser energy and significantly improve work efficiency and processing quality. Therefore, understanding how laser focusing lenses work and why they are important will help optimize the performance of laser equipment and support various industrial applications.

Basic Concepts of Laser Focusing Lenses

1. What are Laser Focusing Lenses

Laser focusing lenses are optical components specially designed to control and adjust the characteristics of laser beams. They are usually made of optical materials with high transmittance, such as quartz, optical glass, or plastics with high refractive index. Its main function is to focus the divergent laser beam into a small spot, thereby increasing the energy density of the laser for various applications, including cutting, welding, and engraving.

2. How Laser Focusing Lenses Work

The working principle of laser focusing lenses is based on optical refraction. When a laser beam passes through a focusing lens such as a convex lens, the curvature design of the lens causes the light to change its propagation path when passing through it, forming a focus. Ideally, after passing through the lens, the laser beam can be focused to a very small point, called a focus. At this point, the energy of the beam is concentrated at this point, resulting in a very high power density, which helps to achieve efficient material processing and precise operation.

3. Impact on laser quality and processing

The focusing lens has a vital impact on laser quality and processing effects. First of all, the optical quality of the lens determines the focusing accuracy and spot size. Good optical quality can reduce light scattering and distortion, and ensure high energy density of the laser beam. Secondly, the focusing effect directly affects the processing speed and quality. Accurate focusing can improve the cutting speed of materials and the stability of welding. In addition, appropriate focusing parameters (such as focal length and transmittance) can also reduce the heat-affected zone and reduce deformation or damage of the workpiece. Therefore, choosing the right laser focusing lens is crucial to improving the performance of the overall laser processing system.

Function of Laser Focusing Lens

1. Focusing laser beam: The primary function of laser focusing lenses is to focus the divergent laser beam into a small spot, thereby increasing the energy density of the beam, which is essential for high-precision processing.

2. Improving processing efficiency: By concentrating energy, focusing lenses can speed up cutting, welding or engraving, improve the overall efficiency of material processing, and reduce processing time.

3. Improving laser quality: Laser focusing lenses can improve the quality of laser beams, reduce the shape distortion and energy scattering of the spot, thereby ensuring the consistency and accuracy of processing.

4. Controlling the heat-affected zone: Appropriate focusing settings can reduce the size of the heat-affected zone and reduce the deformation or damage that may occur to the material during processing.

5. Realizing multifunctional applications: Different focusing lenses can adjust the focal length and spot size as needed, so that the laser system can adapt to a variety of application scenarios, such as cutting, welding, engraving and medical treatment.

Characteristics of Laser Focusing Lens

1. High transmittance: Laser focusing lenses usually use high-quality optical materials to ensure good transmittance within the working wavelength range and minimize light loss.

2. Specific design curvature: The curvature design of the lens is precisely calculated to achieve the best beam focusing effect, and different curvatures can be used for different application requirements.

3. Stability and durability: Laser focusing lenses usually have high mechanical strength and temperature resistance, and can withstand high energy and high temperature conditions during laser processing.

4. Diversity of optical functions: Some focusing lenses can also combine the functions of other optical components, such as filtering, beam splitting, modulation, etc., to enhance the overall performance of the laser system.

5. Strong adaptability: Focusing lenses with different focal lengths and spot sizes can be designed and produced to meet the needs of a variety of industries and applications, ensuring the flexibility and applicability of laser processing.

Laser focusing lenses play a key role in laser processing systems. Their functions and characteristics complement each other and jointly promote the application and development of laser technology in various fields.

Types of Laser Focusing Lens

Laser focusing lenses can be divided into many types according to their design, materials and application areas.

1. Classification by shape

Convex lens: This is the most common type of focusing lens, which can focus the beam to a point. Suitable for most laser processing applications.

Concave lens: Although not used for focusing, it can expand the laser beam and is often used in some special configurations.

2. Classification by material

Optical glass lens: Made of high-quality optical glass, it is suitable for general laser applications and is relatively economical to manufacture.

Quartz lens: It has higher optical transmittance and heat resistance, and is suitable for high-power laser and UV laser applications.

Plastic lens: It is light and low-cost, suitable for some lower-demand applications.

Crystal lens: Such as germanium or silicon, it has special optical properties and is mainly used for infrared lasers.

3. Classification by function

Single focus lens: It has only one focus and is suitable for simple laser processing tasks.

Multifocal lens: It can focus on multiple focal points at the same time, suitable for large-area rapid processing needs, such as some engraving applications.

Varifocal lens: The focal length can be adjusted, allowing users to flexibly change the focusing effect according to processing needs.

4. Classification by application

Special lenses for metal processing: specially designed for laser cutting and welding of metal materials, with high transmittance and high temperature resistance.

Medical laser lenses: designed for medical laser equipment (such as laser beauty, ophthalmic surgery, etc.), usually require higher optical cleanliness and biocompatibility.

Scientific research lenses: used in laboratories and research environments, capable of supporting a variety of complex experimental configurations and measurements.

5. Classification by coating

Reflective coating lenses: coating treatment on the surface of the lens to reduce reflection loss and increase laser transmittance.

Protective coating lenses: coating can provide additional protection against scratches and chemical corrosion, extending the service life of the lens.

Different types of laser focusing lenses have their own characteristics in design and function to meet the needs of different laser applications. Choosing the right lens is essential to optimize the performance of the laser system and improve the processing quality.

Parameters of Laser Focusing Lens

Specification
Material	Fused Silica
Diameter Tolerance	+.000", -.005"
Thickness Tolerance	±.005"
Surface Figure	Plane: 1/0.5 Curve: 3/1 (Power/irregularity)
Centration	<.001"
Focal Length Tolerance	<1.0%
Surface Quality	<10-5 scratch-dig Laser Finish
Spectral Performance
Standard AR Coating type Both Sides @ 1070nm (AR Coating)
Absorption	<30PPM
Transmittance	>99.9%

Considerations for Selecting Laser Focusing Lens

When purchasing laser focusing lenses, there are several key factors to consider to ensure that the selected lenses can meet the specific application requirements.

1. Material selection

Choose the right material according to the application requirements:

Optical glass: suitable for general laser processing, cost-effective.

Quartz: suitable for high-power lasers and UV lasers, with high transmittance and heat resistance.

Plastic: low cost, suitable for low power and simple applications, but the optical performance may be insufficient.

Optical crystal: such as germanium or silicon, suitable for infrared lasers, with specific optical properties.

2. Technical parameters

Focal length:

Choose the appropriate focal length according to the specific requirements of the laser light source and application. The focal length affects the size and depth of the focused spot.

Diameter:

The diameter of the lens should match the diameter of the laser beam to ensure the full beam is effectively utilized and energy loss is avoided.

Optical quality:

Optical quality includes transmittance, surface finish and shape accuracy. Select lenses with high-quality optical standards to ensure the clarity and stability of laser beam propagation.

3. Supplier selection

Brand reputation:

Choose well-known brands or reputable suppliers who usually provide high-quality products and reliable technical support.

After-sales service:

Understand the supplier's after-sales service policy, including warranty, return and exchange policy, and technical support. Good after-sales service can provide timely help when problems arise.

4. Cost and budget

Price-performance ratio:

When selecting lenses, compare the prices of different brands and models to ensure the best price-performance ratio within the budget.

5. Compatibility

Compatibility with laser equipment:

Make sure that the selected lens is compatible with the existing laser equipment, including installation interface and operation requirements.

6. Application environment

Environmental adaptability:

Consider the environmental conditions where the laser focusing lens will be used, such as temperature, humidity, and possible chemical corrosion, and select lenses with corresponding tolerance.

7. Technical consultation

Professional advice:

If you are not sure what type of lens to choose, it is recommended to consult the manufacturer of the laser equipment or a professional consultant for technical support and advice.

By fully considering the above factors, you can more effectively choose the laser focusing lens that suits your needs to improve the effect and efficiency of laser processing.

Maintenance and Care of Laser Focusing Lens

Laser focusing lenses are particularly important for their maintenance and care due to their importance in laser processing and applications. Proper cleaning, storage, and regular inspection and replacement can greatly extend the service life of the lens and ensure the efficient performance of the laser system.

1. Cleaning method

● Steps to safely clean the lens:

Use appropriate tools:

Use a microfiber cloth (lint-free cloth) or a dedicated optical cleaning cloth, and avoid using ordinary paper towels or clothing to prevent scratching the lens surface.

When cleaning, you can use an air blower to gently blow away dust and particles on the surface of the lens, and avoid direct contact with the lens with your hands.

Choose a cleaning solution:

If necessary, you can choose a dedicated optical cleaning solution and avoid using cleaners containing alcohol or other corrosive chemicals.

Cleaning steps:

Gently dip the microfiber cloth into the cleaning solution (never soak the entire lens).

Use a gentle spiral motion to clean from the center of the lens to the outer edge, avoiding rubbing back and forth to reduce the risk of scratches.

If there are stubborn stains on the lens, gently repeat the above steps until the stains are removed.

Drying:

After cleaning, make sure the lens is dried naturally, and avoid using heat or fans to accelerate drying.

2. Storage conditions

● Recommended storage method:

Specialized lens box:

Place the lens in a dedicated optical lens box to avoid direct exposure to the air to reduce the possibility of dust and scratches.

Avoid humidity:

The storage environment should be dry and avoid high humidity to prevent mold or corrosion.

Temperature control:

Store in a location with moderate temperature and avoid extreme temperatures to ensure the stability of the material.

Horizontal storage:

The lens should be placed horizontally, not vertically, to avoid deformation or sliding of the lens due to gravity and scratches.

3. Necessity of regular inspection and replacement

● Regular inspection:

Inspection frequency:

Depending on the actual frequency of use, it is recommended to inspect the lens monthly or before each use. If it is used intensively, the inspection frequency needs to be increased.

Inspection items:

Check whether the lens has scratches, cracks or other damage.

Check whether the optical coating has peeling or discoloration.

● Necessity of replacement:

Obvious damage:

Once obvious scratches, stains that cannot be removed or coating damage are found on the surface of the lens, it should be replaced in time.

Performance impact:

If the processing quality is found to be degraded, such as unclear focus, beam scattering, etc., it may be that the lens has reached the end of its service life and should be replaced.

Through effective maintenance and care, the service life of the laser focusing lens can be maximized and the performance of the laser system can be guaranteed to be stable during operation. Proper cleaning, storage and regular inspection are the key to ensure that the laser lens can remain in good condition for a long time.