What is an active laser?

It can be divided into two parts: wavelength and power. The wavelength unit is NM. The commonly used wavelength is 532nm. There are other different wavelengths, such as 405nm, 650nm. Otherwise, power is the key factor of the laser. The minimum power is about 3MW. The strongest power can reach 1000mw. But he has no right to use it, except for special purposes, which requires permission to use. In the market, a laser pointer less than 300mW can be used. 3. The laser pointer has many colors, such as green, red, blue and purple and blue. The most common is the green laser pointer. The lower the laser power, the cheaper the price. If you want to buy a cheaper high powered laser pointer, you should choose green because it is more conspicuous and brighter. When you are ready to buy, you should be very clear about your purpose. Then you can make wise choices in terms of strength and color. If you are just using it in lectures or classrooms, the 50MW active laser is your best choice. The lower the laser power, the cheaper the price. If you want to buy a cheaper laser pointer, you should choose green because it is more conspicuous and brighter.