Single-frequency fiber laser: It has the advantages of long coherence and narrow linewidth and plays an important role in many special fields. Since the advent of the first ruby laser in 1960, laser technology has undergone many changes, and now it has become a covering industrial processing, communications, medical, military Important technologies in many fields. The most well-known in recent years is the fiber laser.
As we all know, according to different working media, lasers can be divided into six types: solid-state green laser pointer, gas lasers, dye lasers, semiconductor lasers, fiber lasers and free electron lasers. Compared with other lasers, fiber lasers have the advantages of simple structure, high conversion efficiency, good beam quality, low maintenance cost, and good heat dissipation. Therefore, fiber lasers have become the mainstream light source in traditional industrial manufacturing fields such as metal cutting and welding.
According to data from the Research Center, the global laser market reached USD 13.754 billion in 2018, a year-on-year increase of 5.3%; of which fiber lasers accounted for 51.4%, a year-on-year increase of 6.1%. Due to the impact of fluctuations in the economic environment this year, the development of the industry has slowed down. It is expected that the growth rate of the fiber laser market in 2019 will be basically the same as last year, within 6.5%.
Although fiber lasers are the largest player in the current laser market, in recent years, the homogeneity competition in China’s fiber laser market has been serious, and finding differentiated advantages has become a topic that companies attach importance to. The protagonist we are going to discuss today is that in addition to the good monochromaticity and directivity of the laser itself, there are also single-frequency fiber lasers that have the advantages of long coherence length and narrow spectral line width that are difficult to achieve by ordinary lasers.
What is a single-frequency fiber laser pointer? The so-called single-frequency laser, or single-longitudinal-mode laser pointer, is a high-precision single-longitudinal-mode ultra-narrow linewidth laser source based on semiconductor laser pumping, rare-earth-doped fiber as the gain medium, and relatively complex control technology. This laser can provide low phase noise and relative intensity noise, extremely narrow spectral linewidth and long coherence length.
Single-frequency fiber lasers first appeared in the 1990s and have made great progress after nearly 30 years of development. Different from the high-power fiber lasers used in the material processing field, this single-frequency laser, located on another track in the fiber laser market, has completely different application scenarios due to its unique properties and characteristics.