How powerful is the high-power laser pointer?

Most laser pointers will use a fixed focus or focusable output. If the laser has a fixed focus, it means that you cannot change the width of the beam itself (wider or thinner). It is standardized from the aperture to usually between 1.5 mm-3.0 mm, but will always remain at that specific width. Focusable lasers (as you want) allow you to expand or shrink the beam. So, you may ask, what are the advantages of using a focusable laser compared to an unfocused laser? simple. More beam control. The harm of "laser pointer" Because the laser pointer has a strong focus, the irradiated part can produce a heating effect, which satisfies the fresh and curious psychology of minors, and is therefore widely welcomed by primary and middle school students. Normally used laser pointers are generally divided into blue light 1W , You can light a cigarette in 1 second. I heard that the green light 200mW can light a cigarette, but it takes longer. It is a bit difficult to make a laser, and the laser must be made in a dust-free workshop. Batteries, most of the flashlights on the market are in the shape of They use 18650 batteries and 16340 batteries, or the pen-shaped ones, and use 2 AA batteries.