At present, the application of laser technology has entered our daily life and has become an ideal tool for material processing. At the same time, in the field of laser pointer technology and key devices, researchers have not stopped. Realize the widest spectrum dark soliton pulse output. Ultrashort pulse fiber laser has the characteristics of easy operation, compact structure, stable performance and low cost. It is widely used in high-speed optical communication, optical sensing, optical frequency comb, lidar, spectral analysis, military and other related fields. One of the research hotspots in the field.
In view of the limitations of dark soliton pulse generation technology, young teachers of the School of Science and Technology of University of Posts and Telecommunications theoretically analyzed the dynamic behavior of dark soliton pulse generation and experimentally realized the widest spectrum dark soliton pulse output. Based on the nonlinear Schrodinger equation and the complex Ginzburg-Landau equation, the transmission characteristics of dark soliton pulses in fiber lasers are studied by changing the nonlinear parameters of the fiber. The method of weakening the interaction of dark soliton pulses is theoretically proposed and realized experimentally Stable output of dark soliton pulses in fiber lasers.
Through theoretical calculations, the dispersion and nonlinear parameters of the fiber laser cavity were further optimized, and the widest spectrum dark soliton pulse fiber laser was successfully developed. The shortest pulse width was 67 by the collaborative optimization of the tapered fiber and the saturable absorption material. FS hybrid mode-locked fiber laser output. The research group also used it for all-fiber laser mode-locking, and further realized a mode-locked pulse laser output with a pulse width of 246 fs. It is known that this is the shortest pulse width report produced by the transition metal sulfide all-fiber mode-locked laser to date.
The efficiency of the miniature UV-band femtosecond pulse tripler is increased threefold. Researchers at the University of Warsaw have developed a miniature triple frequency doubler with a conversion efficiency of more than 30%. A single-beam laser is focused by a cascaded second-order frequency doubler to generate 246 fs ultraviolet pulses. Through the three-dimensional modeling of the propagation process of the focused broadband light field in the nonlinear and birefringent media, the design of this ultra-small high-efficiency inverter can be realized.
Although advanced laser technology has been able to cover a wider spectral region, it is still difficult to achieve about 300nm ultraviolet band laser, especially making high-intensity short-pulse ultraviolet red laser pointer is even more difficult. Normally, scientists convert a near-infrared laser pulse into an ultraviolet laser pulse through a nonlinear frequency converter. However, the adjustment of the inverter is extremely complicated, and its conversion efficiency is only about 10%. The miniature UV-band femtosecond pulse tripler developed by the University of Warsaw makes it possible to manufacture deep-UV band lasers.