The special damage mechanism of the laser pointer?
With the focus of national and international attention on the violence in Portland, Oregon, a unique pattern of injuries suffered by LEO emerged: intentional laser eye damage. As an example of their ability to cause serious eye damage, the use of high powered laser as weapons violates the Geneva Conventions. However, it was reported that protesters in Portland used them against LEO. Ophthalmology referral is mandatory, but their options are also limited. Although both topical and systemic steroids have been used, there are conflicting data regarding the ultimate vision improvement of the victim. Even among people with improved vision, no one can fully recover, and all of them continue to show persistent retinal scars, even if their final vision is 20/20.
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These high-efficiency lasers usually emit light in the green spectrum. Unlike red lasers, the green spectrum occurs at different wavelengths, including invisible infrared radiation. The shorter the wavelength of green light, the more obvious the photothermal damage. In one study, 90% of green laser pointers tested output power greater than 5 mW, which is the threshold for "high power" lasers. As of December 2018, 171 cases of laser pointer eye injuries have been recorded in published medical literature. Approximately half of patients see a doctor 1 to 7 days after laser exposure. The typical process of laser pointer retinal damage is a sudden loss of vision, sometimes after a "flashing" light is felt, and the loss of vision improves in the following weeks. First of all, the technical content of the green laser pointer is not very high, it is mainly composed of several main components: battery compartment, circuit board, 808nm infrared laser diode (pump source), laser crystal (crystal Nd: YVO4, KTP crystal), expand Collimating lens group. Due to size limitations, 510nm / 515nm / 520nm / 525nm / 532nm laser pointers are unlikely to reach more than 2W. But some crooks on the market have reached 50,000mW, which is a stupid joke!
2021-11-11 08:25:31
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