The most common lens options are 1.5, 2.0, 3.0 and 4.0 inch. These measurements refer to the focal length (see diagram), required for each lens to be perfectly in focus. For example, a 1.5” lens needs to be precisely 1.5” above the face of the material to be properly focused. The main factors differentiating each lens, is spot size and depth of focus. The smaller lens, the smaller the focal length and spot size.

What is a goodStrehlratio

A smaller lens allows for finer resolution when engraving. However, smaller lenses have a reduced depth of focus, causing decreased cutting capacity and are only recommended for cutting thin materials.

This parameter is mostly of interest for people working in the Adaptive Optics domain. It has been customized for Adonis and is recommended to use with great caution in the parameters you provide in input. The Strehl ratio is a criterion indicating the quality of an Adaptive Optics correction. See the litterature in this domain for a more complete definition, or the strehl manual page. strehl man page Nicolas Devillard 2002-04-01

Strehlratio MTF

Most laser cutter/engraver systems will come standard with a 2 inch lens as this gives the best overall performance, with a balance of good engraving resolution and cutting capability. See overview below.

Strehlformula

The larger the lens, the larger the spot size and depth of focus, increasing the cutting capability. Larger lenses are recommended for cutting thick materials and cutting at increased speeds. However, the larger the lens the more you will be sacrificing engraving resolution. The spot size also affects beam energy, which is why a larger lens requires a higher wattage laser.

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The Strehl ratio is a criterion indicating the quality of an Adaptive Optics correction. See the litterature in this domain for a more complete definition, or the strehl manual page. strehl man page Nicolas Devillard 2002-04-01

Strehlpronunciation

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Strehlratio calculator

This article will explain these differences and aims to give you a deeper understanding on which lens is the most appropriate to use.

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– Largest depth of focus– Best used for cutting thick materials or engraving materials with curvature– Very large spot size requires high power lasers.

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Strehlratio formula

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How do laser focus lenses work? Lasers use an intense beam of light to cut, engrave or etch directly onto the surface of a variety of materials. For instance, a focus lens in a Co2 laser cutter/engraver converges the laser beam to create a focus point where the laser is cutting or engraving the material. This point is at the sharpest convergence of the beam, and is commonly referred to as the ‘spot size’. Several factors affect this spot size, which will ultimately determine the outcome of your project.

– Best overall, a good compromise of focus sharpness and depth of etching– Can cut materials of relative thickness, with appropriate laser power input– Mostly used for engraving