Femtosecond laser technology was developed with the clamping technology. In 1965, the first time using passive mode-locking technology to generate picosecond (ps=10-12s) pulses directly on the ruby ​​laser, and then using the collision-locking technique in 1976. The 0.3ps laser output was realized. In 1981, Fork. RL of the United States first obtained the femtosecond (fs=10-15s) pulse using the principle of collision locking. Since then, laser technology has entered the era of femtoseconds. However, since the dye laser that generates the femtosecond laser at that time has a complicated structure, its operability is poor, and it is difficult to achieve miniaturization and application. In the 1980s, a solid-state laser crystal (output wavelength of about 800 nm) represented by titanium-doped sapphire crystals (output wavelength of about 800 nm) appeared, which laid the foundation for the solidification and practical use of femtosecond lasers. By the end of the 1980s, the developed titanium gemstone (gain medium) had excellent physical properties, a very wide emission bandwidth, and a gain bandwidth of 230 nm. Theoretically, a 3fs pulse output can be obtained in an ultrashort femtosecond pulsed laser. Has played an important role. Camping Light,Outdoor Light,Outdoor Camping Light,Emergency Rechargeable Searchlight Cangnan Younglite Electrical Co., Ltd. , https://www.younglitetec.com