When I was younger, I was curious when I saw the Green laser pointer my mother brought home from work, I thought it could give off such a straight light. I asked him how the laser pointer was invented. After searching on my phone, I told us that lasers were discovered by Einstein, and my mother thought at the time, they are technological products, they are made according to people's needs! Lasers are a key component of many of the products we use every day. Consumer products like Blu-ray and DVD players rely on laser technology to read information from discs. Barcode scanners use lasers to process information. Lasers are also used in many surgical procedures, such as LASIK eye surgery. Lasers are used to cut, sculp, drill holes and mark various materials during manufacturing.
Laser working material: refers to the material system used for inverse population ratio and amplification by laser radiation, sometimes called laser gain medium, they can be solid (crystal, glass), gas (atomic gas, ionic gas), molecular gas), semiconductor and liquid. The main requirement of laser working materials is to achieve as high a degree of population reflectivity as possible between the specific energy levels of their working particles and to maintain this reflectivity as efficiently as possible throughout the laser emission process. The active substance should have appropriate energy level structure and transition characteristics.