In 1987, the earliest green laser pointer was used in the treatment of myopia. For more than 30 years, this technology has gone through at least six stages of development. At present, the most advanced full femtosecond laser minimally invasive surgery has narrowed the incision to 2 to 4 mm.
Recently, the Sinisa Vukelic team at Columbia University developed a non-invasive non-invasive laser vision correction method.
The Vukelic team’s goal is to achieve true non-invasive vision correction, and researchers use femtosecond oscillators to generate very high-frequency pulsed lasers. It can induce the ionization of water molecules in the cornea, produce reactive oxygen species and interact with the surrounding collagen to form cross-linking, thereby changing the structure of the cornea to achieve corrective vision. Experiments have shown that this change in the cornea is photochemical, and the collagen fibers are not subjected to thermal denaturation.
Traditional myopia surgery is to cut the corneal flap and grind some corneal tissue. Even the most advanced full femtosecond laser technology will produce incisions, which have more or less hidden dangers. This new technique is to change the corneal structure of the affected area. This method can be used not only on the eyes, but also on other collagen-rich biological tissues.
Related research results have been published in Nature-Photonics. According to the Australian News Network, China has developed a powerful new green laser pointer assault rifle that can destroy targets nearly one kilometer away and make it feel unbearable pain.
It is reported that this new type of weapon is a ZKZM-500 laser assault rifle weighing about 3 kg, which is about the same weight as the AK-47, and can be installed on a vehicle with a range of 800 meters. The rifle can be recharged through a re-powered lithium battery and can be fired more than 1000 times after each charge, with each launch lasting no more than 2 seconds.
According to reports, such lasers are currently classified as “non-fatal” (weapons) and have a range comparable to sniper rifles. Scientists involved in the manufacture of such laser weapons say that because of the small size of the weapon, it is ready to be put into mass production. The production cost per weapon is 100,000 yuan.