Co2laser lens

As the focal spot gets smaller, sharper details are seen in the laser image that is processed, producing a brighter and more detailed image.

The focus tolerance (depth of focus) is the area in which the beam has the smallest diameter. The larger the lens the longer the focal tolerance. This is especially important if you want to cut through thick materials in which case you will need a larger lens. The shorter the lens focal length, the more quickly it will converge/diverge, the smaller the focal spot will be and the shorter the depth of focus will be.

Laser cutting and engraving machines use a laser beam with a diameter around one-quarter of an inch (240 thousandths). In order to achieve high-quality engraving and precise cutting, the laser beam uses a system of mirrors and focus lens that redirect the laser.

Laser lenstypes

Laser systems use plano-convex lenses to focus laser light. Laser light enters a convex lens and begins to converge to a focal point, upon crossing the focal point, the light then diverges out again.

As an important conclusion you can see that the more delicate and detailed the graphics are, the smaller the lens should be. For cutting thick materials, lenses of maximum size are recommended.

Laser LensMinecraft

BesCutter CO2 laser systems are typically equipped with one standard 2.5’’ focal lens for all the CO2 systems manufactured, but it can change depending on the application. The most common laser lenses are 1.5’’, 2’’, 2.5’’ and 4’’. All of the lenses are suitable for both cutting and engraving works.

Laser lensIndustrial Foregoing

Laser beam quality is more complicated and subtle than is usually assumed, a fact that has caused no end of frustration and misunderstanding between laser manufacturers, users, and acquirers. Laser Beam Quality Metrics guides the reader through the subtleties of laser beam quality analysis and requirements synthesis, arming the reader with the tools to understand beam quality specifications and to write custom specifications that are traceable to the intended application.

The book is geared toward engineers and laser physicists involved in the development of laser-based systems, especially laser systems for directed energy applications. It begins with a review of basic laser properties and moves to definitions and implications of the various standard beam quality metrics such as M2, power in the bucket, brightness, beam parameter product, and Strehl ratio. The practical aspects of beam metrology, which have not been sufficiently addressed in the literature, are amply covered here.

For those who are only interested in measuring Gaussian beams from commercial lasers, a reading of Chapter 1, Chapter 2 “What Your Laser Beam Analyzer Manual Didn’t Tell You,” and the first three sections of Chapter 6 “Cautionary Tales” will be sufficient. For those working in more off-the-map fields such as unique lasers, unstable resonators, multikilowatt lasers, MOPAs, or requirements generation and development, a reading of the entire text is recommended.

This focus converts the laser beam into a very small and precise spot with extremely accurate results for a wide variety of applications. As the laser beam leaves the focus lens, being positioned in the ideal focal distance, it starts to make the cut or engrave, as it is showed below:

The lens you need is directly related to your application. These are some important considerations that will define the lens you must use: