Can an intense laser pointer burn a match?

Laser pointers can be found everywhere, and you can buy them everywhere in stationery stores. The cheapest laser pointer is only 5 yuan. The diffused light of some high-power laser pointers may also cause damage to the eyes, and it is more likely to ignite flammable materials after focusing. In such an experiment, the laser pointer not only ignited a match quickly, but also burned through a thick 6-page newspaper in less than 10 seconds. Take out a blue Laser pointer, "The new blue LED lamp as a solid light source has a relatively large single point power. Once the light enters the fundus of the human eye, the damage to the human eye retina is also great, so the blue light hazard cannot be ignored. ". The laser is such a high-energy beam. The high-intensity laser pointer will produce a strong laser with an output power of 100mw, that is, the power of 100mw is concentrated on a few mm² area. Think about the energy density of 0.1 joules per second, heating on a small area of ​​10e-6m², how high the energy density is. Naturally, the temperature of the irradiated point will rise sharply, resulting in a burning effect. In addition, some high-intensity laser pointers have a focusing function, which can converge the parallel beams of light, and the light spots are concentrated in a smaller area, and the burning effect is further greatly improved. But even so, if you want to burn cloth, wood, plastic, etc., the more popular high-intensity laser pointer with 200mw power needs to be continuously irradiated at the same point for at least a few seconds, and it takes longer to encounter white or the same material as the laser color. . So there is no point in hurting people at all.