How does the laser pointer emit radiation?

The laser pointer emits a beam (laser beam) that is amplified, beamed and directed. As a result, for the date, the laser pointer produces a very high-intensity laser beam in a small area. Strength-or performance-is expressed in watts (W) or milliwatts (mW = 1/1000 watts). The higher the wattage, the more dangerous the laser beam. Since the laser beam is hardly scattered, the diameter of the laser beam is very small even if it is pointed far away from the laser pointer. This quality not only makes him attractive as an optical pointing instrument, but also attracts children's interest, especially when it can generate pre-filtered decorations and images. The operation of the laser pen is as simple as a ball pen: if you press the button, the laser beam is turned on. Usually, the laser beam is red or green, but there are also yellow or orange lasers on the market now. The color depends on the wavelength (nm = nanometer). The human visible light is about 400nm (red) to 750nm (violet), and the green laser beam taken from the human eye is considered to be better than the red laser beam, for example. This has the same result. The brightness impression of the red laser must have a significantly higher output power than the green laser.