Therefore, the low divergence angle of the laser has a decisive advantage in the long-range destruction. In general, when the light-emitting area, the wavelength of the longer, the greater the divergence angle. Therefore, the red more than the infrared with long-range advantage. But there are differences due to different mechanism of generation of laser, so when the same power, they are difficult to achieve the same light-emitting area. For example, the 808 infrared light-emitting area than, 980 much larger, so in the same power, 808 of the divergence angle than 980 large. Focus limit: long-range corresponding to the close focus of destruction. The green laser beam light ofgreen laser pointeris much brighter than the blue laser beam light, red laser beam light, yellow laser beam light and purple laser beam light of the laser pointer.
Laser parallelism at the same time, different laser wavelengths have different focus limit, such as 10640 far-infrared laser focus limit of 532 green about 20 times, in other words, the same power per unit area on the 532 radiated power is 10 640 20 times, the gap is quite large. In general, the longer the wavelength of the laser focus limit will be greater. Thermal effects of destruction and penetrating: laser energy density. Therefore, penetrating the lower laser energy density will be able to have better performance. However, there is no absolute relationship between the laser wavelength and penetrating, is the wavelength of the visible range, such as air, the longer penetrate the stronger. Actually, in the market and practical use, the greengreen laser pointer is more popular than the blue laser pointer, red laser pointer, yellow laser pointer and purple laser pointer to some extent.
But the long-wave infrared stage, it has significant thermal effects, and its penetrating become weak. The glass is also true, CO2 laser engraving glass, 532 laser not. Therefore, this should first understand the characteristics of the target on the penetration of various wavelengths. Absorption: This is very important, very significant differences of the different colors of the objects on the absorptive capacity of the various wavelengths of laser. Absorb the worst of the same color, fairly and white; the most obvious anti-color absorption, and black considerable. For example, the green laser is very easy to point the red matches, while Green matches is more strenuous. Ionization: this part of the UV laser. UV laser with high single-photon energy, so it can target ionization. The green laser pointeris widely used in the daily use, especially the commonly seen locations without any specific requirements for the laser pointer.
For organic life, the ionization effects of UV laser destruction of protein and enzyme activity, which is the principle of the ultraviolet light disinfection. Then, the UV laser destruction of life forms is undoubtedly the strongest in the various wavelength. The sensitivity of human eye: the human eye is most sensitive to wavelengths of about 550nm yellow green light in the visible range, the closer the laser of the wavelength of mass destruction on the human eye is the stronger. The difference between class II laser pointer and class III laser. Low output (laser power is less than 0.4mW), regardless of the conditions under which the eyes and skin, will not exceed the MPE value will not exceed the MPE values, even through the optical system is focused. And at the same time, the green laser beam light of green laser pointer is relatively softer.
Can guarantee the safety of design, do not need special management. Typical applications such as laser pointer, CD player, CD-ROM devices, geological prospecting equipment and laboratory analysis instruments. Class Level II: low output visible laser (power 0.4mW-1mW), the closed eyes of the reaction time of 0.25 seconds, use this time to calculate the exposure amount can not exceed the MPE values. Usually 1mW laser under normal exposure to this laser beam does not cause permanent damage to the retina of the eye, but will lead to dizziness can not be thinking, with closed eyes to protect can not be completely safe. It means that the green laser beam light emitted by green laser pointeris not that dazzling.
No comments:
Post a Comment