For decades, Laser pointer have been pushing metal manufacturing forward and continue to do so. But to work correctly and predictably, the beam must be refined for the application. The characteristics of the beam (including its power, power density, and focus) all play a role.
However, if the laser processing itself is not accurately measured, it is difficult to understand what exactly these variables and other variables play, and how each variable is related to each other in a specific application.
You can use common materials for a few dollars to conduct polarization experiments at home. You need a bright beam. This could be sunlight emitted through a hole, flashlight or laser engraver.
For polarized lenses, you can use the lenses of a pair of polarized sunglasses. You can check whether the sunglasses are polarized by holding two pairs of glasses, one behind the other, and looking through the left (or right) lens in series. Rotate one pair of sunglasses relative to the other pair while keeping the lens aligned. If the scenes viewed through the lens become darker and brighter as they rotate, they are polarized. You can also buy polarized glasses or plastic sheets on the World Wide Web.
Release the lens carefully. One lens can be firmly fixed on the holder, while the other lens must be able to rotate. The light is irradiated through the polarizer 1. Place polarizer #2 in the beam after polarizer #1. Turn 2 until the least light passes. Now place the polarizer 3 between 1 and 2. Rotate the polarizer until the last beam is the brightest. By trying different lens combinations and rotation angles, you can verify whether the lenses are at 45° and 90° angles to each other.
Every manufacturing process involving lasers needs to strike a balance between the correct laser variables and the correct processing characteristics. 3-D metal printing illustrates this concept well. To print metal parts, draw the metal powder on the forming area to make it the correct thickness, while the focused laser beam heats the metal powder to the correct temperature; this melts the powder.
If the laser power is too low or the application time is not long enough, the powder particles cannot melt properly; the metal becomes porous and therefore weaker.
If too much blue laser pointer is used or longer than necessary, the laser will drill into the molten powder, reducing the density of the structure. If the focus position is before or after the construction plane, or the distribution of laser power is not optimized, it will lead to insufficient melting of the metal powder. All these conditions have left parts that are metallurgically incorrect.