How to choose a high-quality cutting machine focusing and collimating lens?

August 24, 2023

Fiber Focusing Lens, commonly known as Fiber Focus Lens, serves the same subcategory purpose as a collimating lens. Only a few people out there know about this professional lens-cutting term. When choosing a collimating or fiber focus lens, there exist two types. The types typically include:

· Single piece

· Compound

Purpose of Fiber laser cutting head lens

It is an important part of different laser cutting heads for focusing beams and collimating. It helps achieve the purpose of focusing and cutting the plates more precisely. These head optics typically consist of two types of lenses, including:

· Beam expanding

· Collimating

Types of lenses used in laser processing machines

Different types of lenses are used for different processing systems in lens-cutting machines. However, here we have described some of the most. 

Collimating lens Optics

The collimating lens helps in shaping laser QBH-emitted light into parallel light. It is also a part of different beam systems. Collimating optics helps maintain beam collimation. These optics are important for laser marking, cutting, and welding machines. In addition, it is also used in various other laser processing systems, including optical fiber cutting.

Focusing lens

At the same time, a focusing lens helps these lights to focus. Focusing lenses are also a part of different laser processing systems.


Reflectors consist of multiple dielectric or metal films. These films on optical components are useful for reflecting light wave direction. Reflectors are highly effective in laser beam processing. Above all, the key applications of this lens type include:

· Imaging applications

· Instrument construction

Coupling Lens

Here is another lens type commonly used in laser processing machines. If you need to transmit a laser beam from an optical fiber, collide and focus the laser beam through a lens into the fiber optic. 

Laser focusing vs. laser collimating lens: What must you know about these?

Firstly, both laser focusing and collimating lenses are optical processing components. Both work to control and focus a laser beam; however, these are used in different applications due to their varying working principles.

Laser focusing lens

Laser-focusing lenses are essential optical components in laser systems. It plays a pivotal role in concentrating and controlling the intense energy of a laser beam onto a specific point known as the focal spot. This process, called laser focusing, is critical for many applications, from precise material cutting to engraving.

It helps create a uniform focal point by converging the beam at the fiber’s end and controlling the output beam. Such laser optical lenses are familiar as compound focusing lenses. In contrast, an aspheric focusing lens is used for best practice but also comes with a hefty price tag.

Key characteristics of laser focusing lens

However, you need to know the key characteristics of laser-focusing lenses

· The focusing lens typically features one curved surface and one flat surface. The curved surface helps to bend and converge the incoming laser beam.

· The focal length of a focusing lens determines the distance between the lens and the focal spot. Therefore, a shorter focal length means a smaller, more tightly focused spot.

· Focusing lenses work by causing the laser beam to converge. Consequently, it increases the energy density of the laser at the focal point.

Applications of laser focusing lens

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

Laser Cutting

In industrial settings, focusing lenses are a part of laser cutting machines. It helps laser cutting machines concentrate the laser beam onto a small area of the material. Consequently, it will provide more precise and controlled cuts. 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. Focusing lenses ensure fine detailing and accuracy.

Laser Marking

A laser-focusing lens is crucial in this process by concentrating the laser beam's energy onto a small focal spot, enabling precise and controlled material removal or alteration. A laser-focusing lens helps to create a small, intense focal spot on the material's surface. Then this precision ensures that the mark is sharp, well-defined, and accurately positioned.

Laser collimating lens

Laser collimating lenses are essential optical components that transform a divergent laser beam into a parallel or collimated light beam. This process, known as collimation, is crucial in many applications where maintaining a consistent and well-defined beam profile is paramount. Collimating lenses play a significant role in telecommunications, laser diode modules, laser pointers, scientific research, and various industrial processes.

Key Characteristics of Laser Collimating Lenses:

· Laser collimating lenses typically have both surfaces curved in a convex shape. It enables the conversion of a divergent beam into a parallel one.

· The primary function of collimating lenses is to make the laser beam rays parallel to each other over a substantial distance.

Applications of the collimating lens

Laser Diode Modules

Collimating lenses are used with laser diodes to ensure the output beam remains parallel, facilitating efficient coupling into optical fibers or other components.

Laser Alignment

In various industries, collimating lenses are used for aligning lasers accurately over long distances. It is important in surveying, construction, and laser-based measurement systems.

Additional tips for choosing high-quality collimating and focusing lens

However, choosing the right focusing and collimating lenses for your cutting machine is crucial to achieving optimal performance. Therefore, here we have enlisted important considerations that you must have when choosing a high-quality laser focusing or collimating lens.

So, here we go:

Material Compatibility

Different materials have varying optical properties, so choosing a lens compatible with the laser's wavelength and material characteristics is crucial.

Spot Size

The lens's focal length determines the spot size or diameter of the focused laser beam. Smaller spot sizes allow for greater precision in applications like cutting and engraving.

Lens Coatings

Anti-reflective coatings can minimize energy loss due to reflections, enhancing the efficiency of the lens.

Lens Quality

Opting for high-quality lenses from suitable optical materials ensures consistent performance and longevity.

Divergence Angle

The lens design and focal length determine the divergence angle reduction the collimating lens achieves.

Beam Diameter

In addition, the diameter of the collimated beam depends on the lens design and the initial beam's characteristics.

Final Thoughts

Selecting high-quality focusing and collimating lenses for your cutting machine is important for optimal performance. The process typically involves understanding the characteristics and applications of these laser lenses. Then you must consider the factors we enlisted here to select the best quality laser focusing and collimating lenses.


Meta Description

Focusing on the quality of laser focusing and collimating lenses is important to make optimal selections. Learn how to select the best laser lenses here.

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