What is a Green Laser?

Green laser: A type of laser whose color is determined by the wavelength (or frequency) of the light.

Green laser

Right!

Green laser: A type of laser whose color is determined by the wavelength (or frequency) of the light.

Chinese name

Green laser

Field

science

Human eyes are more sensitive to green (green appears brighter than other colors). Military experts use this feature to create green lasers, which can cause dizziness and prolonged exposure to blindness that lasts for hours. The North Korean army used lasers to disorient two American Apache helicopters and blinded the pilots, which is believed to be the first case of using non-lethal weapons against the US military. US pilots have since been wearing protective masks.

An article in the "Ophthalmology Literature" states that exposure to a green laser in just 60 seconds can cause significant damage to the retina of the human eye.

A patient who was about to undergo eye removal was involved in Robertson's experiment. The results showed that the pigment layer of the retina of the eye was damaged under the irradiation of the green laser, but the patient's vision was not affected. However, Robertson emphasized that long-term exposure to green lasers, especially when the power of the laser pointer exceeds 5 milliwatts, can cause functional damage to human vision in just a few seconds.

The public should raise awareness and be careful not to let the laser beam hit people's eyes and faces when using green laser pointers.

Laser intravascular irradiation therapy is to introduce a low-intensity laser into a human vein and directly irradiate circulating blood to achieve the purpose of "blood purification". This therapy was introduced in China in 1991 and has achieved significant results in clinical applications. However, at present, red lasers are used for irradiation treatment at home and abroad. The Laser Research Center of Henan Medical University found that the absorption of green laser light by blood is 4 times greater than that of red laser light. From this, they envisioned whether it is possible to use a green laser as a light source for treatment. But how safe is the green laser to directly circulate blood? What is the safety threshold? No report at home or abroad. Therefore, this research center started with experimental research and carried out research on the safety of green lasers.

Professor Zhang Ping and others introduced semiconductor green lasers of different powers and doses directly into the hind limb veins of 7 dogs for irradiation, each irradiation for 1 hour, once a day, 10 times as a course of treatment. During the irradiation process, venous blood from the hind limbs was taken every other day for 6 index tests, such as red blood cells, white blood cells, platelets, and hemorheology. After stopping the photo for 10 days, continue to observe the changes in the above indicators to understand the repair status of his blood cell regeneration. According to the research results, Professor Zhang Ping and others proposed that green laser has the function of improving the function of white blood cells, T lymphocytes and the total number of red blood cells in the blood, which has clinical application prospects; the safety threshold of circulating blood for dogs with semiconductor green laser irradiation is: power 8mW , Power density is 28.57mW / mm2, each dose is 102.85J / mm2.

This research lays the foundation for the clinical application of green laser, and it is expected to be applied to clinical treatment of blood diseases and other diseases as soon as possible.