How to select the right lens for your application
Trotec Laser
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In the world of laser technology, precision is paramount. Whether you're engraving intricate designs or cutting through thick materials, achieving perfection in your laser projects begins with selecting the right lens. This often-overlooked aspect can make all the difference between a job well done and one that falls short of expectations. Let's dive into the essentials of lens selection and how it can elevate your laser game.
Choosing the right lens can be tricky
The parameters are fine and the focus is set correctly, but somehow the engraving is not correct. Has this ever happened to you? This is most likely a lens issue. The correct lens is just as important as the right parameters and optimal focus adjustment.
To select the correct lens, you must consider the following:
The rule of thumb
Here's a handy rule of thumb: the more delicate and detailed your graphics, the smaller the lens you should choose. Conversely, for cutting through thick materials, opt for a lens of maximum size. Refer to the table below for more detailed guidance.
The Speedy and SP lens portfolio
For those using Speedy lasers, Trotec Laser offers a diverse portfolio of lenses tailored to various applications. Understanding which lens suits your specific needs can significantly enhance your laser work.
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Technical features in plain terms
Understanding some key lens-related terms can demystify the selection process:
Focal length Distance between the lens and the point of the smallest beam diameter (= focus).
Focus The area where the laser beam is optimally focused and converges to the smallest possible beam diameter.
Beam diameter The diameter of the laser beam which becomes greater and greater before and behind the focus. The longer the focal distance of the lens, the greater the beam diameter. The energy of the laser is focused by the lens onto a defined focal point. The greater the focal distance of the lens, the greater also the surface onto which the energy of the laser is applied. This may mean that if you use a large lens, the material is heated rather than cut.
Focus tolerance (depth of focus) The area in which the beam has the smallest diameter. The larger the lens (= the larger the focal length of the lens), the longer the focal tolerance. This means that the focus tolerance of a 5” lens will be twice that of a 2.5” lens. This is especially important if you want to cut through thick materials.
In conclusion, selecting the right lens is an art in itself. It's about aligning your lens choice with the specific demands of your laser project. With the right lens, you unlock the full potential of your laser system, achieving superior results, and mastering precision.
We will be happy to assist you in selecting the ideal lens for your project.