Laser lensIndustrial Foregoing

Lenses are easy to change, so many users keep more than one focal length on hand for increased material processing capabilities.

The diameter of the laser beam does not stay constant throughout its depth of focus. Instead, it converges to its smallest diameter at the focal point, where the beam’s power density is highest. Above and below the focal point, the beam widens, decreasing in power density.

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Focal length is the distance between the laser lens and the surface of the material being processed; determining the correct one depends on your application(s). For general purposes, a 2.5″ focal length is popular because it balances engraving precision and cutting depth.

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Boss Laser offers CO2 lenses with 2″, 2.5″, and 4″ focal lengths. Premium ZNSE lenses made in the USA are also available, providing a 14% transmission rate improvement.

Use Cases: Ideal for high-precision engraving and cutting of thinner materials. The shorter focal length produces a smaller spot size, resulting in finer detail.

Use Cases: A versatile choice that balances engraving and cutting capabilities. It’s suitable for a broader range of material thicknesses and applications.

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Factors such as the laser’s wavelength, the focusing lens’s focal length, and the initial beam diameter influence this. High-quality laser machines, like those from Boss Laser, provide precise focus control, enabling optimal processing across different materials and applications.

The focus tolerance, also known as the depth of focus, refers to the zone around the focal point where the beam remains effectively narrow. This focus depth increases with larger lenses, which is especially important when cutting through thick materials. The shorter the lens focal length, the quicker it will converge/diverge, resulting in a smaller focal spot.

When choosing a CO2 laser lens, it is important to consider the requirements of process. Boss Laser offers three lens options: 2″, 2.5″, and 4″. The 2″ lens is ideal for intricate engraving and can cut materials up to ¼” thickness. The 2.5″ lens is the most commonly used option and provides a balance between detailed engraving and the ability to cut materials up to ½” thickness. The 4″ lens is recommended for cutting materials over ½” thickness with high efficiency.

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Use Cases: Designed for cutting thick materials. The longer focal length allows the laser beam to maintain focus over a greater depth, enhancing its ability to cut deeply.

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The optimum focal length depends on the application. 2.5″ is the most common, balancing the ability to engrave fine details with the ability to cut materials up to 1/2″.