Have you heard of laser pointers?

The most important factor of a laser is the output power. The power of a portable laser is less than 5mw, while the power of a civilian laser can reach 5000mw (5w), but how much power is needed to make a “hot laser” hot enough?

Laser patterns, also known as laser patterns, pointers, etc. The early laser mode used a 633 nm (nm) He-Ne laser, which was usually used to generate beam energy no more than milliwatts. The cheapest laser pointer uses a red laser diode with a wavelength of about 670/650nm. More expensive is the use of red and orange 635nm diodes, which are easier to recognize by the human eye. There are laser pointers of other colors, the most common green wavelength is 532m. In recent years, the 593.5nm yellow laser pointer has also begun to appear. In September 2005, the 473nm blue laser pointer came out. In early 2010, a 405-nanometer blue laser (actually ultraviolet) appeared. From 2012 to 2013, with the emergence of 510/520nm laser diodes, 510-520nm waves also appeared.

The visible brightness of the laser pattern depends not only on the laser power and surface reflection level, but also on the color of the human eye. For example, since the human eye is most sensitive to light with a wavelength of 520-570nm in the visible spectrum, green light is less sensitive to red or blue light, and at the same power as other colors, green light is brighter.