How to choose a high-quality cutting machine protective lens? Everything you need to know

August 24, 2023

Cutting machine protective lenses are known by several names, but they source the same purpose of protecting electronic components, including semiconductors and sensors, in the machine. These make a vital component in the cutting machines since they change the optical path of the laser without changing the magnification.

Hence, the cutting quality is not affected, while different parts of your machine will get the required protection. However, you need to buy the best lens-protective window for the best protection, and here, we will share everything you need to know when selecting them.

What is a high-quality cutting machine protective lens?

Unlike lenses, it is an optical glass plate with parallel surfaces. It is made after keeping properties like surface accuracy, transmittance, thickness, substrate material, and parallelism in concentration. Keeping all these properties right allows these glass plates to work in different environments without worrying much about the cutting quality.

Sometimes, the bare protective lens glass is not effective enough. In that case, anti-reflective films, anti-scratch films, and other protective coatings are best for the glass plate. It improves the performance and quality of the lens by making it resistant to water, dust, and scratches.

What is the importance of a high-quality cutting machine protective lens?

We have high-power fiber laser cutting machines in several industrial and non-industrial fields today. This is because products need high-accuracy cutting results, and the thickness of metal sheets decreases, making these fiber laser machines more applicable.

Since the cutting head can collect a lot of energy, these protective lenses protect the core components from slag, splashes, and dust and protect the internal optical path of the laser. Protecting this path is very important because if it gets any obstructions at the start of the path, the laser's efficiency can decrease, increasing consumption.

Choosing the right protective window is very important because:

· Unqualified lens-protective windows can heat up rapidly

· There could be a focus shift, resulting in poor results

· There could be reverse-focusing issues

· You may end up damaging expensive components, etc.

Factors to consider when choosing a high-quality cutting machine protective lens

When choosing the machine protective lens, you need to consider a few technicalities, including:

 1. Dimensions of the lens

Always start with the dimensions of the lens. You need to select the diameter and thickness carefully since any error in these parameters will ruin the performance of your system. Not using the perfect parameter means that the sealing ring is not perfectly sealed, and gas can leak, while dust can pollute the internals even from such small openings.

2. Lens coating

The lens comes with different coating types, and those are selected by the customers when buying. The coating types are selected according to the lens's usage environment and other technical parameters. Coating not only protects the lens glass but helps manage laser power as well. Since anti-reflective coating can improve cutting performance, the product will be cut finely, and the chances of it bursting during cutting will significantly drop.

3. Lens material according to its power

When selecting material for your protective lens, consider your applications and the usage cost. Lens material has a huge impact on the efficiency of your machine and its power consumption. It is the reason why lens materials are divided into 3 main categories, as discussed below:

a) Quartz glass

Quartz glass is mainly selected for mainstream applications and is known for its excellent laser resistance and stability. It has better chemical and physical properties, including:

· High purity

· Wide spectral transmission

· Thermal shock resistance

· Ray radiation resistance

· electrical insulation

· Chemical stability

· Wavelength

· High-temperature deformation resistance, etc.

It has two types: JGS1 and JGS2, each having different properties, benefits, and uses. JGS1 is expensive, while JGS2 can be cheap.

b) K9 glass

It is also known as optical glass and is used for applications requiring a transmission range between 380 and 2100nm. Some of its main properties include:

· Low bubbles and impurities in glass

· High homogeneity

· Good scratch resistance

While it has some amazing physical properties, the thermal extension coefficient is large, making it unsuitable for applications with high-temperature sensitivity. Hence, it is often the best choice for low-power applications.

c) Silica glass

This laser material is not good at heat resistance and does not bring other impressive physical properties. Hence, it is usually the best choice for low-energy applications. Otherwise, it is used after being fused with quartz glass material.

No matter which one you need to buy, Startnow Laser is your best choice. Here, you can find accessories and parts for different machines with the reliability of quality, perfection, and latest technology. Hence, your machine's efficiency improves with the best-quality parts per your requirements.

Difference in blue and yellow film

Another thing that you may find when choosing a protective lens is blue and yellow film options. Each one comes with different qualities, which include:

· Transmittance is lower for the yellow film at 650nm, making it dimmer

· For the 1064-1080nm segment, the yellow film gives higher transmittance

· Blue film is better in terms of pass rate stability

Due to these differences in the blue and yellow films, yellow film is often the best choice for high-power lenses

Should you go for blue film or yellow?

The blue film has stable and better pass rates, while the yellow film is known for its higher transmittance. So, the blue film often makes the better choice for low-power applications, while the yellow film is better for high-power applications. Hence, selecting the lens protective window while considering this for better results is important.


High-quality parts will give you much better ROI, stability, and reliability. The second most important thing here is investing in the right parts. When selecting a cutting machine protective lens, you need to be careful about dimensions, material, coatings, film type, and other technicalities about the lens.

This is the only way you will invest in high-quality parts and accessories that meet all your usage requirements. Hence, you will get higher efficiency and better results with the best protection for your cutting machine's lens and internal components.

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When choosing a high-quality cutting machine lens, you must consider dimension, coating, material, and film type according to your usage requirements.

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