The reason for inventing the green laser pointer
The original laser pointer mainly used a small helium-neon laser with a wavelength of 632. Snm as the light source. Because of the low power of this laser pointer, the indicating effect was not obvious, and it was easy to damage, it was quickly used as a laser with a red laser diode as the light source. Replaced by pens; with the development of semiconductor laser technology, laser pointers with deep red laser diodes as light sources have emerged successively to laser pointers with red-orange laser diodes as light sources, with wavelengths covering 650nm-670nm. In recent years, green laser pointers with a wavelength of 532nm, yellow-orange laser pointers with a wavelength of 53.5nm, blue laser pointers with a wavelength of 473nm and violet laser pointers with a wavelength of 405nm have appeared one after another, greatly enriched The range of laser pointer color selection.
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Green starts from the visual effect that the human eye is most sensitive to green light. The green laser pointer can be used as a small full-solid solid-state laser. It is suitable for holography, low-light inspection, Green laser pointer demonstration, and laser drying involving physical experiments. Light laser light source. From a photometric point of view, the apparent brightness of the light spot irradiated by the laser pointer not only depends on the power of the laser and the surface reflectivity of the display screen, but more importantly, it depends on the visual perception of the human eye. In 1924, the International Commission on Illumination, based on the visual function measured by several groups of scientists on more than 200 observers in the 400-750nm spectral range, found that under photopic conditions, the human eye is most sensitive to 555nm green light; in 1951, The International Commission on Illumination has also announced the visual function of scotopic vision. In a dark environment, the human eye is most sensitive to 507nm green light. Other colors are brighter.
2021-10-06 01:11:55
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