Many handheld Laser pointer use a fixed focused beam, which means you cannot change the width or intensity of the beam diameter. If your laser power is high, it is suitable for burning experiments, but using a pointer with a focus-adjustable lens will add more beam control and allow you to actually reduce the beam size and have a large impact on the target. Increase strength. Looking for a laser with focus adjustment options, you will usually turn to the left to expand the beam and reduce the heat intensity, then turn to the right to reduce the beam diameter and increase the burning capacity. This is essential for mW power units on the edge of the combustion limit.
This area cannot regenerate itself. Usually, blinking reflex or eyeball rolling is a protection mechanism to protect the eyes from laser damage below 1 mW. This type of laser engraver will only cause damage when the exposure time is longer than 0.25 seconds. This is the typical blink time. However, not only children or children who react quickly, but in fact most people respond to it.
The good thing is that the pupils are not very large and we can usually avoid it, but this does not mean that it is still safe.
Needless to say, but using high-power lasers, especially lasers with burning function, requires more safety considerations than the laser pointers you use daily. Most high-quality, high-power handheld lasers come with a pair of safety glasses, but if the pair of glasses you are considering does not (may be used elsewhere), or just add a pair of safety glasses to your order. You can't use standard UV protective sunglasses (this is another common misconception) because they will not block specific wavelengths of laser light like certified laser safety devices. When using laser goggles, for example, when you cut black electrical tape, you can observe the target and the beam, which can actually track the movement in a straight line and increase the burning speed and reduce the time. This makes it a more versatile and safe tool for everyday use.
Even if we adjust and test the blue laser pointer to ensure that its power stays below 1 mW, most of the devices you can buy from direct dealers (all of which are known to the best of your knowledge) are mistaken for safe, but They are indeed risky.
These laser pointers are usually battery-powered and are more dangerous at blue or green wavelengths because their output is never the output specified in their documentation.