Lol
I read somewhere that laser doesn’t emit a color. So that means everything is Star wars and Star trek was fake?
> I read somewhere that laser doesn’t emit a color. <
They don’t. Whenever I demonstrated a laser to a class, I would sprinkle chalk dust along the path of the laser to make it visible.
I have written many angry and complaining letters to the Star Trek people in that regard. So far, no response.
I'm not sure where you are getting your information. Lasers can emit electromagnetic radiation at a varieties of wavelengths, many of them visible to the naked eye. I agree that some of them might be difficult to see (hence the enhanced visibility when talcum powder or the like is sprinkled in the beam). Is that, like sunlight, you can't actually see it until it interacts with an object?
CO2 lasers emit in the infrared and are therefore invisible. Other lasers, like Ar or ruby, emit in the visible and show color. Example - a lasr pointer.
Depends on the type of lasers...there are many. Some emit visible light (typically red or green...see laser pointers), some infrared (basically heat), which is invisible to the eye. Then you get into the exotics, like the "free electron laser" which can be tuned to output many wavelengths...but only one at a time. It's been a few years since I researched available laser tech, so this is certainly a very incomplete summary.
Laser beams are not visible unless there are quite a lot of particulates in the path of the beam that are reflecting or refracting the light. You can see this yourself with a cheap laser pointer and a bathroom fogged with steam; so no, real lasers don’t look like Star Wars or Star Trek in real life. Things that DO look like SW/ST weapons in real life - particle beams and hypervelocity weapons (railguns, among other things). If we ever get plasma weapons working, they will look pretty much like they are depicted in Hollywood.