the semiconductor laser is developing in the direction of shorter emission wavelength, larger emission power, ultra-small, and long life, to meet the needs of various applications, the product category is increasingly rich. It has also been widely used in laser processing, 3D printing, lidar, laser ranging, military, medical and life sciences. In addition, high-power direct semiconductor lasers are widely used in cutting and welding fields by coupling into optical fibers for transmission.

The laser display technology, which uses solid-state laser working material pumped by semiconductors and controls the reflection of red, green, and blue laser light ​sources on DMD chip, has become one of the mainstream display technologies in the future and is also the key strategic technology of China's key development.

In many industrial applications, infrared lasers have very good results. However, for the processing of non-ferrous metals, especially copper, the absorption of non-ferrous metals to the laser is very low due to the wavelength of an infrared beam, which brings instability to the operation of the welding process, resulting in welding errors in production and resulting in waste products. For high absorption, blue light with a wavelength of 450nm is the ideal choice.

In modern society, glass is a very more important material in industrial production. Whether in machinery, construction, decoration, or the production of electronic products, different types of glass have different roles.

Fiber laser is a laser with rare-earth-doped glass fiber as a gain medium. Fiber lasers can be developed based on fiber amplifiers. Under the action of pumping light, the high power density is easily formed in the fiber, resulting in the "particle number inversion" of the laser energy level of the laser working substance, and the laser oscillation output can be formed by adding a positive feedback loop (forming a resonant cavity) appropriately.

There are many ways to classify semiconductor lasers. On the basis of the wavelength can be divided into the far-infrared laser, near-infrared laser, visible laser, ultraviolet laser, and other categories. Visible semiconductor lasers (wavelength 400~700 nm) are one of the important categories. The blue semiconductor laser is a semiconductor laser whose output wavelength is in the range of 400 -500 nm.

Laser processing refers to the use of laser beam projected on the surface of the thermal effect of the material to complete the processing process, including laser welding, laser cutting, surface modification, laser marking, laser drilling and micro machining. Laser can adapt to all materials processing and manufacturing, especially in some special precision requirements, special occasions and special materials processing and manufacturing has an irreplaceable role.

Lidar is an important sensor integrating laser, GPS positioning and inertial measurement device. Its wavelength is mainly located in the near infrared part of the electromagnetic spectrum (780nm, 808nm, 850nm, 940nm, 1064nm).With the emergence and development of intelligent vehicles, laser radar has a broader space.

The competition between countries is actually the competition of science and technology, in the field of science and technology, chip demand is everywhere, chip has become the core of the competition among countries in the world.Under the background of global "lack of core", the road of independent chip research and development in China's technology industry is imminent.Under the guidance of the 14th Five-year Plan, the inclination of social resources and the introduction of countless funds, the domestic chip industry will take advantage of the situation into the fast track of vigorous development.

Short-wave length infrared band referred to as"SWIR”. SWIR located in the non-visible spectrum between near infrared (NIR) and long wave infrared (IR).The general wavelength range is 1400-3000nm, which contains rich material spectral information.