Since its invention, laser has been widely used in industrial processing, medical beauty, scientific research and other fields due to its excellent characteristics. The laser has four main characteristics, namely high brightness, good directivity, good monochromaticity and high coherence. These characteristics are related to each other, enabling the laser to be adapted to different scenes.
High brightness
A laser with high brightness is mainly due to its high concentration of light beams. The high brightness of the laser is also a manifestation of its high concentration of energy. After focusing by the lens, thousands of degrees, even tens of thousands of degrees of high temperature can be formed near the focus, which makes it possible to process almost all materials. It is precisely because of this advantage that it can be widely used in industrial processing and medical fields.
Good monochrome
The color of light is determined by the wavelength of light, and light has a certain wavelength range. The narrower the wavelength range, the better the monochromaticity will be. The line width of the laser is limited by many factors, and it is almost impossible to reach the theoretical level. For example, changes in temperature, slight vibrations in the laser, airflow in the volumetric optics, and external pumping can cause instability in the resonant frequency, which can result in reduced performance.
Good directivity
The light emitted by ordinary light sources propagates in various directions, and the divergence angle is large. In comparison, the divergence angle of the laser is small and is emitted almost in parallel. The light emitted by the laser is a kind of polarized light with a fixed direction. A simple case can visually express this: laser water does not refract.
High coherence
The light wave is composed of countless photons. The light quantum emitted from the laser is consistent in wavelength, frequency and polarization direction due to the resonance principle, which makes it have a very strong interference force. We also generally refer to lasers as coherent light. It is precisely because the laser is much more coherent than ordinary light sources.
