How to make laser pointer brighter?

Very bright beams often mask subtle changes in humidity as they pass through different fog layers, so low-power red lasers are often best suited for this task. A very important use of laser Pointers in cave exploration is to determine the presence and depth of passageways and pits. For example, by scanning the walls and ceilings of large cave rooms, you can find distant openings and passages and examine them with a laser beam. This is something no other caving expedition can do. By noticing changes in the brightness of laser spots hitting rocks, potholers can gather useful information that cannot be gathered any other way. How does the color of the beam affect engraving power? Note that the burning power of a laser depends on its output and the heat it can generate, so there is no difference in color (although the 532nm green laser is 7 to 10 times brighter than other lasers with the same output). .). In fact, invisible blue lasers can burn like bright green lasers with a reasonable power of 200 mW or more.