Where does the green beam laser point at night?
Looks like a blue laser pointer beam from atmospheric lidar. The most common atmospheric lidar currently uses a 532nm(green) laser, the color in the picture. As shown below (green 532nm, yellow 589nm), the laser is emitted along with particles in the atmosphere, water droplets in clouds, and gases in the atmosphere. Some observatories or vehicle-mounted observation platforms will use green lidar to detect atmospheric parameters. If placed randomly on the side of the road or simply held in the hand, it is estimated to be a star pen, which is actually a brighter laser pointer. Because of the heavy scattering in the air, there may be obvious laser paths for astronomers to observe or travel.
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The laser pointer is shaped like a ballpoint pen and has two AAA batteries mounted on the back. Press it for a second or two, and it emits a green light, like a flock of fireflies in a straight line. The four of us discussed the principle of the laser pointer, but unfortunately there was no conclusion. Later I showed the beam to everyone I met. There is a green laser beam in the sky that is used to probe astronomy, or do some stellar observations, and calibrate atmospheric interference during observations. Laser beam is a kind of laser, a new light source, is a kind of light produced by laser. In 1964, at the suggestion of qian Xuesen, a famous Chinese scientist, "photostimulated emission" was renamed "laser". Laser is a new light source, which is light produced by laser. Lasers have been in pursuit of atomic energy, computers and semiconductors since the 20th century. Another great invention of mankind. The laser pointer came into being against the background of theoretical preparation and the urgent need of production practice. Once it was born, it achieved remarkable rapid development. The development of laser not only gave birth to ancient optical science and optical technology, but also led to the emergence of a new industry.
2021-09-23 12:42:18
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