Ultrashort pulsed fiber laser is easy to operate, compact in structure, stable in performance and low in cost. It is widely used in high speed optical communications, optical sensing, optical frequency comb, laser radar, spectrum analysis, military and other related fields. One of the hot topics in the field. At the same time, as a frontier topic in the study of nonlinear optics, ultrashort pulsed fiber astronomy laser pointer technology has become one of the core technologies of national strategy and high-end industrial industries. In order to realize the ultra-short pulse fiber laser output, how to further recognize the nonlinear dynamics of the fiber laser and realize the non-linear control of the optical devices in the laser cavity are the key scientific issues involved in this technology.
The brighter light will make the object appear clearer and the appearance will not change. But if the light is one billion sun-lit lasers and the object is a single electron, the "look and feel" of the electron will change radically, a marvel that scientists observe when using the brightest laser light in the world. Photons scattered by an object enter the eye, allowing one to see the object. Normally, every single electron in a material can reach a photon for an average of four months. Previous experiments have only been able to make a single electron scatter several photons at a time. In addition, the scattered photon angles and energies are independent of the brightness of the light source.
Using ultra-intense lasers in extreme light lab equipment, the researchers irradiated electrons suspended in helium for the first time to achieve high-order scattering, with up to nearly 1,000 photons striking the same electron at a time. The results show that when the laser intensity exceeds a certain limit, the mode of electron scattering photons is completely different from the mode of low intensity. The angle and energy of the scattered photons will change with the laser intensity, which is equivalent to the different shapes and colors of objects under different brightness lights. Laser photons released by the electron will absorb all the energy of scattered photons, as X-ray. The resulting X-ray pulse has a very short duration, high energy, and a relatively low frequency that produces high-precision, three-dimensional images at lower doses for detecting tumor tissue in the body and detecting tiny defects inside the material, Used as a super-fast camera to observe particle movement or chemical reaction.
The transmission characteristics of dark soliton pulses in fiber lasers are studied by changing the nonlinear parameters of optical fibers. The method to weaken the interaction of dark soliton pulses is theoretically proposed and the stable output of dark soliton pulses in fiber lasers is experimentally achieved. After theoretical calculations, the dispersion and nonlinear parameters of the fiber laser are further optimized, and the most wide-spectrum dark soliton-pulsed fiber laser is successfully developed. The shortest pulse width is achieved by the synergetic optimization of the tapered fiber and the saturable absorbing material fs hybrid mode-locked fiber laser output. The group will also be used for all-fiber laser mode-locked, and further to achieve a pulse width 246 fs mode-locked pulse laser output. It is known that this is by far the transition metal sulfide all-fiber mode-locked laser produced by the shortest pulse width.