you obviously have no idea what how a laser works. as someone that spent years learning it, ill explain.
one of the mirrors (on most mirrors) is a straight full reflecting surface. the other is a partial reflective surface. youve all seen mirrors like this. when you drive, the mirror inside the car has two settings. during the day, you have it set one way and can see clearly behind you via the mirror. at night, when a car is behind you, you turn it to the second setting and the light does not seem so bright. a person setting in the car with you, will see the light hitting your cheek or your forehead. the reason is that the mirror has two surfaces. the front is a partial reflective surface, reflecting about 10 percent of the light. the second surface (the back one) is fully reflective. the two surfaces are set a short angle apart. that allows you to see the two images at a different spot.
in a laser the second mirror (low reflective) reflects a part of the laser back, and allows the rest to pass. depending on the size and type of laser it could be anything from a 1 percent to a 99 percent reflective. there are even a few that dont have a second mirror. a small number of them actually dont have mirrors. they have an exciter laser, usually something like a led laser, that is beamed though a medium, taking the energy from the molecules as it passes.
the mirrors and medium does not increase the speed of the laser. if it did, there would be too many varibles for the laser to work.
