Coherence keeps the laser pointer beam focused at a distance

Why is the laser beam so thin? There is no absolute reason to say that they must be thin. The “green laser pointer” is only light amplified by stimulated radiation, so if you prepare some optical gain medium in its excited state and put in some “seed” light of the correct frequency, it will be…

I am looking at how to use the thin laser pointer beam

I’m not entirely sure what you mean is that thick and wide are two different things. My view on the product described in her link is a device that uses an IR green laser pointer diode as an illumination source, and uses an adjustable zoom lens type device to spread the light from the laser source to…

Never point the laser pointer can be in the eyes

How much power does the laser pointer need to emit a visible beam? This is not a question of power, which is equal to the intensity of the laser. A more powerful green laser pointer will make the spot farther and brighter. The laser line used in the building is a spot of light “diffused” through a…

The laser pointer beam behaves differently from other light sources

How accurate is the laser tape measure? More accurate than steel belt. When you measure a distance greater than about 3 meters, the tape will inevitably sag, so the measurement is not very accurate. green laser pointer measurement working at the speed of light does not have any sagging. Obviously the cheaper model is not accurate, but…

Is the green laser more dangerous than the red laser?

Why does my green laser pointer (532 nm) turn yellow when it touches the orange part? It will not change the color on any other surface. Due to the fluorescence of the surface material/pigment/paint. Usually we can observe it with ultraviolet light or at least a blue light source. But F. means consuming certain wavelengths of light…