I have a magical laser pointer. My laser pointer is very delicate. It is silver-white. There are two small buttons on the cap and a searchlight like an elephant’s nose. The laser pointer has many functions. Press the front button to turn it into a flashlight and help at night. I illuminate; press the button at the back, it will emit infrared; press twice, it will turn to blue light. Pull down the end of the pen harder, and the Laser pointer will become longer and become a teaching stick; rotate the end of the pen, and it will become a pen for writing. Therefore, I like my laser pointer very much.
Laser is another major invention of mankind since the 20th century, following nuclear energy, computers, and semiconductors. It is called the “fastest knife”, “most accurate ruler”, and “brightest light”. The light emitted by the stimulated atoms of the atom, hence the name “laser”. Light is when the electrons in the atom absorb energy, transition from a low energy level to a high energy level, and then fall back from a high energy level to a low energy level. The energy released during the fall is released in the form of photons. The laser is a photon queue that is lured (excited). The photons in this photon queue have the same optical characteristics and extremely consistent pace. An analogy is that ordinary light sources, such as light bulbs, emit different photons, and they will run around in all directions, which is not united. However, the photons in the laser are thinking about one place and moving toward one place. This leads to They are invincible and powerful. Lasers are widely used, mainly including laser marking, laser welding, laser cutting, optical fiber communication, laser spectroscopy, laser ranging, laser radar, laser weapons, laser discs, laser pointers, laser vision correction, laser beauty, laser scanning, Laser mosquito killer and so on.