Today, the maximum power of light emitted by all green lasers has reached the FDA-specified 5 mW. The current green laser pointer manufacturers are listed in alphabetical order in the accompanying photo gallery with a brief overview of their models. Among them, only Viridian manufactures green lasers. The remaining products mainly provide red laser products and some green products. Prices for government-specific versions of infrared lasers range from less than US$100 to more than US$3,000. You can pay $200 to $300 for the high-quality green laser that comes with a pistol or rifle.
Education is also the key. By informing parents, teachers and the whole society of the potential dangers of laser engraver pointers, any risks they cause can be minimized, and the equipment can be used correctly and safely according to the original intention.
The work of the Grandjean team was completed more than ten years ago, and the highest point occurred in 2007, when they demonstrated a blue VCSEL pumped with an argon ion laser emitting laser. However, when their VCSEL is driven by electricity (a working mode required by actual equipment), they can only extract incoherent light from it. Further progress will require further improvements in the manufacturing process, but because these work made decision makers believe that the necessary breakthroughs will be achieved through the work of Japanese researchers in the 1990s to develop light-emitting nitride devices first, so these work cannot be obtained. funds. .
The American Laser Society believes that further management of laser pointers should now be considered. A viable option is to further limit the power that the blue laser pointer pointer can emit.
Sony’s high-power design has competition in the form of a blue-emitting VCSEL based on an architecture that shares several features with EPFL’s early work. In 2017 researchers at Meijo University and Nagoya University in Japan used a dielectric top mirror and a bottom mirror containing AlInN to construct a VCSEL with a 4.3 mW output. They reported their progress at the International Workshop on Nitride Semiconductors in Strasbourg, France, and Grandjean, of EPFL, called it an impressive result. “The secret is with the growth conditions,” he says. “They can grow at a high temperature and faster, so they improve both the quality of the material and the growth time.”