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Method to prevent infrared leakage of green laser pointer

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In the Green laser pointer, the infrared light from the semiconductor diode laser pumps the 808 nm wavelength infrared light into the transparent yttrium orthovanadate crystal doped with neodymium atoms, so that the crystal produces deeper laser light in the 1064 nm infrared light. . This light passes through a potassium titanyl phosphate (KTP) crystal, which emits light at half the wavelength: 532 nm, which is a common color for green laser pointers. The team reported in their research that the problem stems from imperfect manufacturing quality assurance procedures.

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Ordinary people can perform simple tests to detect excessive infrared leakage; by using ordinary digital or mobile phone cameras, CDs, webcams, and TV remote controls, they can "feel" the presence of infrared through the different capabilities of these devices. In any case, the study emphasizes that users should not point the laser pointer at the eyes of humans or animals. In addition, do not point the laser at a surface such as a window, as the window can reflect infrared light back to the user. This is a particularly subtle hazard because many modern energy-saving windows have coatings specifically designed to reflect infrared light.

2021-10-11 12:00:28

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