A laser diode (1) generates laser light that travels down a fiber optic cable (2) and enters the laser head. The laser head (5) which contains an Nd:YVO4 (Vanadate) laser crystal (3), produces intense, short pulses of laser light. These pulses are directed onto the work piece (8) by a pair of computer controlled scanning mirrors (6). A portion of each laser pulse is absorbed by the work piece depending on the properties of the material. When marking, each pulse creates a chemical change in the work pieces surface, producing a smooth visible mark. When engraving, each pulse physically removes material from the work piece (a process known as laser ablation), producing a tiny hole with each pulse.
The semiconductor laser diode (1) takes electricity as input and produces laser light as output. The laser diode emits continuous wave (CW) laser light at a wavelength of 808 nm. Since the output wavelength depends strongly on the diode temperature, the markers utilize a thermo- electric cooling system which guarantees that the laser head (5) receives stable input. The laser light from the diode travels from the controller through a fiber optic cable (2) to the laser head (5), which is situated inside the marker.
The laser head (5) contains a number of optical elements, most importantly an Nd:YVO4 (Vanadate) laser crystal (3) and a Q-switch (4). The Vanadate crystal absorbs the 808 nm laser light from the diode (1) as input and produces continuous wave (CW) laser light at a wavelength of nm. The Q-switch (4) converts the CW light from the Vanadate crystal to a stream of light pulses. As a simple analogy, imagine kinking a garden hose for a second and then releasing it. The kink-and-release process is repeated very rapidly. In this manner, a big pulse of water is produced at regular intervals from a steady input stream. A Q-switched, Vanadate laser follows a similar pattern. While the Q-switch (4) is closed, the laser diode (1) fills the Vanadate crystal (3) with energy. When the Q-switch is opened, the stored energy comes out of the crystal as very short, intense pulses of laser light. The Q-switch is capable of opening and closing 1,000 to 70,000 times per second.
The pulses of laser light that emerge from the laser head (5) are directed to a pair of scanning mirrors (6). The mirrors are rapidly tilted using galvo-scanners. Software running on a desktop or a laptop computer controls the motion of the mirrors, directing each pulse to the proper location on the work piece (8).
The laser pulses that leave the scanning mirrors (6) pass through a specially designed lens (7), known as an F-Theta lens, which focuses them onto the work piece (8). The F-Theta lens is the final component of the marking system; it is specially designed to produce a flat, tightly focused image on the work piece, typically less than 40 microns (less than 2/ths of an inch) across. In this manner, a high resolution mark is obtained. Additionally, by squeezing the energy contained in each pulse into the smallest possible spot, the marking/engraving capability of each pulse is amplified, increasing both the quality and speed of the marking process.
Choosing the right portable laser engraving machine comes with understanding how the machine works and other needed prerequisites. These might be highly demanding. However, below are a few factors that will help choose the best portable laser engraver.
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Price is a huge factor when deciding to get a portable laser engraver. Unlike traditional laser engravers, a portable engraving machine is portable while still exceptionally good for industrial use. A portable engraving machine also boasts of heightened ease of operation due to its features. Therefore, the price of getting one is higher than the conventional laser engravers.
Software compatibility is an important factor when looking to get a portable laser engraver. There are two options available. You can get a portable laser engraver with its software. Therefore, you have to ensure your designs fit into the engravers software. The second option is to get a portable laser engraving machine that can work with your software. Therefore, when you create a design with your software, it will be compatible with it. A good example of a software-compatible engraver you can get is the portable 20w fiber laser marking machine.
What do you think will improve the ease of operation the portable laser engraving machine is popular for in terms of power source? Battery support, of course! In conjunction with a corded power source, having a portable laser engraver with a battery option also makes it easy to use in any condition.
The laser source is also an important feature to look at when getting a portable laser engraver. Look for a machine using a noiseless laser source that makes the process environmentally friendly.
Although this might not be essential, it is never the less important. It is better to find a portable laser engraver that does not need to connect directly to a computer. Most portable laser engravers we know use USB sticks to connect to the computer. This further ensures ease of operation.
Portable laser engraver also varies in their portability due to the weight factor. This is based on the different features of the machine and the optimization given by the manufacturer. Therefore, when choosing a portable laser engraver, choose one with the right size and weight that can complement the functions. However, note that weight also drives prices. Therefore, portable laser engravers with a smaller size that can be used industrially, such as the portable fiber laser marking machine, have more features and higher prices.
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