Single Frequency Laser With Unique Performance And Wide Application Range

The output power of single frequency lasers continues to increase while the noise continues to decrease, making them the most practical and representative product types among current single frequency lasers. They are widely used in the field of high-speed and high-capacity fiber optic communication.
Photons in the resonant cavity of a laser can move along the cavity axis (longitudinal) and cross-section (transverse) to output the laser. Single frequency laser, also known as single longitudinal mode laser, is a type of laser product with unique performance advantages, characterized by a combination of single transverse mode and single longitudinal mode output laser modes.
Single frequency lasers are mainly in the form of solid-state lasers, and their products mainly include two categories: single frequency fiber lasers and single frequency semiconductor lasers. The main technical solutions for single frequency lasers include short cavity method, dispersion cavity method, ring cavity method, filter method, etc. Among them, the dispersion cavity method generally uses the insertion of gratings into the laser resonant cavity, based on the principle of grating feedback to achieve laser emission, and includes two types: distributed feedback (DFB) lasers and distributed Bragg reflection (DBR) lasers.
Distributed Bragg Reflector (DBR) single frequency laser, which integrates Bragg gratings inside the resonant cavity and can integrate multiple regions, has the characteristic of wide tunable range. With the emergence and continuous progress of rare earth doped fiber technology, the output power of DBR single frequency laser continues to increase and the noise continues to decrease, making it the most practical value. It has become one of the most representative product types in the current single frequency laser, and is widely used in the field of high-speed and high-capacity fiber communication.
According to the "2024-2029 China Single Frequency Laser Industry Market Deep Research and Development Prospects Forecast Report" released by the Xin Sijie Industry Research Center, single frequency lasers have advantages such as narrow spectral line width, long coherence length, high output power, good beam quality, low noise, compact structure, small size, and high stability. They are sensitive to high-precision vibrations and have high long-distance sensing accuracy. Therefore, they can be widely used in remote sensing, sensing, speed measurement, ranging, imaging, and other fields. They have obvious competitive advantages in industries such as communication, radar, life sciences, medical, oil and gas exploration, scientific research, and entertainment.
Industry analysts from Xinsijie stated that due to its unique performance, single frequency lasers have strong irreplaceability in some special application fields. Therefore, since entering the 21st century, their technology has been continuously improving. In China and globally, research institutions related to single frequency lasers mainly include Harbin Institute of Technology, Beijing Institute of Technology, Shanghai Institute of Optics and Mechanics, Chinese Academy of Sciences, National Institute of Information and Communication Technology of Japan, National Center for Scientific Research in France, and Langley Research Center in the United States. Overall, the global single frequency laser industry has a promising development prospect.