Development Trend Of Fiber Laser Marking Machine

(1) Improvement of the performance of fiber lasers: How to improve output power and conversion efficiency, optimize beam quality, shorten the length of gain fiber, improve system stability and make it more compact are the key points of future research in the field of fiber lasers.
(2) Development of new fiber lasers: In the time domain, ultrashort pulse mode-locked fiber lasers with smaller duty cycle have always been a hot topic in the laser field, and high-power femtosecond pulse fiber lasers have always been a long-term goal. In the frequency domain, broadband output and tunable fiber lasers will become a research hotspot.
Research on fiber lasers began in the late 1980s. Due to its ability to generate ultrashort pulses and its broad application prospects, countries around the world have shown great enthusiasm for fiber laser research. Compared with other types of lasers, fiber lasers have outstanding advantages such as high reliability, simple structure, low price and high conversion efficiency.
Domestic research in this field was also carried out relatively early, and many research results have been achieved both theoretically and experimentally. However, compared with foreign countries, there is still a large gap. In particular, there are relatively few studies on high-performance fiber lasers, and the work done on practical application is far from enough, and the results are not very ideal. Therefore, it is necessary to further strengthen the research on passively mode-locked fiber lasers.
In 1963, Snitzer first reported Nd-doped fiber lasers, which opened a wave of research on fiber lasers. Especially in recent years, with the progress made in fiber design and production, the output of fiber lasers has continued to increase, and the CW output power of a single fiber device has increased from hundreds of watts to kilowatts. At the same time, the improvement in the production technology of high-quality optical fibers with large cladding diameters and large numerical apertures makes it easy to achieve effective coupling with diode pump power.
The most significant advantage of fiber lasers is their extremely high pumping efficiency. In general, the pump conversion efficiency is 70%-75%, which is much higher than that of industrial diode-pumped solid-state lasers (DPSSL). Such a high conversion efficiency reduces the cooling and power requirements of the laser system, and can be more compact than the structure of traditional solid-state lasers. In addition, the all-fiber structure can provide a very sturdy and highly reliable packaging design. Moreover, fiber lasers can significantly enhance the output beam quality.
Another important advantage is that fiber laser technology can greatly extend the life of the device (compared with DPSSL), which has led to increasing investment by industrial laser companies that focus on fiber lasers, because long-term reliability is very important from the application level. Fiber lasers also have other advantages: since the laser medium of the fiber laser is itself a waveguide medium, the coupling efficiency is high; the fiber laser can be easily and efficiently connected to the fiber transmission system; the fiber core can be made very thin and can achieve high power density; the heat dissipation performance of the optical fiber is good, so the fiber laser has a high conversion efficiency and a very low threshold; the output wavelength of the fiber laser covers a wide range, from 400 to 3400nm, which can meet the application needs of various aspects, and has good application prospects in industry, commerce, communications, military, medicine and other aspects.