Blue LED of high-power green laser pointer

In addition, since we learned about LEDs and recently invented the blue LED, in retrospect, I think I have never seen a blue high powered laser, even though I have seen a red laser. In some cases, the green laser. Therefore, I guess that the laser and LED must have very similar structures. In fact, I also assume that manufacturing green lasers is more difficult than red lasers, because red lasers are much more expensive and cheaper than green lasers. In the computer industry, I have encountered several devices that use laser technology to operate. There are three main reasons for choosing this technique. First of all, the reason is to show the laser, to show a certain place in some places, such as a presentation. Second, the reason is to use this technology as a way to navigate through surfaces to understand movement, such as a laser mouse. Thirdly, the reason is to emit laser light, to understand data by receiving some laser light, such as CD ROM and DVD ROM, they emit laser beam and hit the surface of CD or CD.