Enter 1 unless you also want to calculate harmless "visual disturbances", such as flash blindness and glare, which are based on the color of the green laser pointer beam. (Compared with the same amount of blue or red light, the human eye will think that green light is brighter and interferes more with vision.) The following is the FAA vision correction factor for the selected laser wavelength. For example, if your laser is the common 532 nm green, you would enter 0.8802 as the VCF. If you don't know the wavelength of the laser, or you want the safest and most conservative calculation, please enter 1 as the VCF-this will give the longest dangerous distance. The laser beam spreads slowly. At the nominal eye hazard distance (NOHD), the light beam has spread sufficiently, so the light intensity (irradiance) directly entering the eye is at the maximum allowable exposure (MPE). Unfortunately, recent correlations published by behaviorists, trainers, and veterinarians indicate that there is a strong correlation between behavioral problems in dogs that are regularly exposed to laser pointers.
In NOHD, the irradiance will be higher than MPE, which is potentially dangerous. However, exposure to lasers in NOHD does not mean that a person will automatically be injured by the eyes and may even be injured. The measurement sensitivity of the laser beam pointing direction is ultimately limited by the quantum nature of light. In order to reduce this limitation, we have manufactured a quantum laser pointer through experiments, which is a beam whose direction measurement accuracy is higher than that of a normal laser beam. The high powered laser pointer is produced by combining three different beams in three orthogonal transverse modes, two of which are in a squeezed vacuum state and one is in a strong coherent field. The result provides a demonstration of multi-channel spatial compression and its application in improving beam positioning sensitivity and more generally for imaging. You can buy them on the shelves of ordinary pet stores, and they are advertised as a "fun" way to exercise your pet. They are small, seem innocent, and very affordable. What could go wrong?