The widely used red laser pointer
Among laser designators, widely used as a standard due to their ease of manufacture is the red laser designator, which has a wavelength of about 635 to 690 nm. In wavelengths near this range, when the wavelength becomes longer, close to infrared (above 700nm), the shorter the wavelength side, the higher the visual sensitivity. In projectors with increased brightness for bright images, the difference in brightness between the spot and the laser pointer becomes narrower, and even class 2 products of 650 to 690 nm may be difficult to recognize, so the more easily recognized 635 nm products are suitable... In terms of manufacturing ease, semiconductor laser devices with wavelength of 650 ~ 690nm can be manufactured at a low cost, so toys or low-cost products with the same wavelength are the mainstream.
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Generally speaking, laser Pointers have low power and high power. According to people's needs, various high powered laser have appeared. Considering safety and practicality, low-power laser Pointers are more practical in daily life. For example, the 20MW laser pointer I'm going to introduce is like this. It looks like a pen and makes you feel close. Its characteristics are as follows. The green 100mW laser pointer is used because of its high visibility. This is because products commonly used as laser Pointers also have legal output limits, so even if the output is the same, a more "easy to see" color makes more sense. There is also an argument that green lasers are easier to detect than red lasers in terms of their use in surgery and visual recognition for people born with color vision defects. DPSS (diode pumped solid state lasers) products are popular for green laser Pointers at low prices, but they are generally more expensive than the red 500mW laser pointer due to the large number of optical equipment and complex electronic circuit parts.
2021-11-08 01:27:16
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