Lower power class 3B goggles
Use laser glasses or goggles for class IIIB lasers with lower power, and class 3B lasers with higher power are recommended. They should be selected to protect against laser power and wavelength. Glasses should not block all laser light. This is because you have to see where the laser "spot" is in order to use it safely. Even when using laser protective goggles, you should use them with caution because they block some or all of the laser (e.g. harmful reflections). Class I lasers are relatively harmless and are used in high powered laser, CD players (they still sell them??) And DVD players. If used with a laser designator, the beam would be relatively weak, hard to see in ordinary light and probably harmless to the eye unless viewed through some kind of magnifying glass. One Country in Europe, Switzerland, has banned all but class I lasers, according to the IEC (International Electrotechnical Commission).The most powerful class 3B laser beam (499 mW) can temporarily blind the pilot or pilot with a flash, creating a residual image within 1 mile (1.6 km) of the laser. Within 4.4 miles (7.1 kilometers) of the laser, it can cause glare and obstruct the sight of the pilot or pilot. Within 44 miles (71 kilometers) of the laser, it outshines surrounding lights, causing distraction.
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In this latest work, John Doyle of Harvard University and his colleagues have now cooled a molecule of three-atom strontium hydroxyl, named after the Greek hero Sisyphus, who was forced to push a boulder to the top of a mountain, roll it down and then often do the work for ever. Sisyphus cooling is a potential energy process in which molecules lose their kinetic energy by "climbing" through laser standing waves generated by combustion. A project called "Green Laser Pointers for Visual Astronomy: How much Power is Enough?" "Asked 23 observers to adjust the power of a 532 nm green laser beam" propagating through the atmosphere into the sky in an urban environment with high light pollution. The lowest power of the beam can be clearly seen to be between 1.4 and 5.6 milliwatts. The average of all the power selected is 2.4 milliwatts. The authors conclude that "green laser designators with an output power of less than 5 mW (American National Standards Institute 3A or INTERNATIONAL Electrotechnical Commission 3R laser rating) appear to be adequate for educational nocturnal outdoor activities, providing an adequate bright beam at a reasonable level of safety."Class 3B lasers are not generally considered a burn hazard to skin or materials. However, if the laser "spot" remains stationary on close skin, the heat can be felt. The higher the power of class IIIB laser, the faster the heat accumulation.Class 3B (and 4) lasers are too powerful to be used as green laser pointer. Some 3B (and 4) class lasers may look like Pointers, but they should not be used for pointing. A class 2 (less than 1 mW) or class 3R (less than 5 mW) laser is used for pointing.
2021-12-20 11:46:15
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