These Laser pointer are not toys. As a suggestion, it is recommended to remove the battery from the indicator when not in use. Some places may wish to register these devices in order to make users aware of safety awareness. Appropriate safety personnel should require that all laser pointers are correctly and clearly affixed with the correct warning signs. The factory may wish to develop its own one-page consultation instructions for all registered laser pointer users.
Safety personnel and pointer users should be aware that wavelengths of approximately 400 to 500 nm (ie, the blue region) can cause biological effects with photobiological properties (such as "sunburn"). The laser working at the peak of the visible light response (Figure 1) will produce a significantly larger evoked response, so be careful.
Do not use a laser pointer above 5 mW.
Laser engraving removes the substrate material at a relatively high temperature, so a high-power laser engraver is used in this technique. This high temperature vaporizes the substrate metal. Compared with the other two techniques, it is very fast and produces a deeper indentation. It is not recommended to use laser engraving for parts that are critical to safety, but to laser engrave parts that are prone to wear. It can be used to create indentations on materials other than metals such as wood, plastic, leather, and glass.
The US Food and Drug Administration (FDA) is warning parents and school officials that hand-held laser pointers may cause eye damage to children.
These products are generally safe when teachers and lecturers use these products as intended to highlight graphs or areas on the screen. However, recent price cuts have led to a broader market, and the FDA is concerned about the promotion and use of these products as children's toys.
The laser pointer can aim the light energy of the eyes more harmful than staring directly at the sun. Federal law requires warnings of potential eye hazards on product labels.
The laser etching process is a bit like blue laser pointer. In this technique, the heat of the beam creates dents in the substrate material. The proper depth can be achieved by etching, but certainly not more than engraving. Etching also changes the surface behavior of the metal, such as contrast, thereby changing the reflectivity. Etching is best for electroplating metals, but the scope is not limited to metals. It also engraves ceramics and polymers.