In this paper we report on a simple method for characterizing ultrashort vortex laser pulses generated from Erbium-doped fiber laser. The single-mode fiber oscillator can produce mode-locked pluses with duration of 316 fs around 1550 nm. By passing linearly polarized TEM00 Gaussian mode-locked pulses through vortex retarders, ultrashort vortex laser pulses are created, and the topological charge numbers of the vortex beams are characterized through far field multi-pinhole interferometer. The experiment results agree well with simulation. This diagnostic method will benefit vortex beam generation and advance its application for ultrafast science.
We describe the photo-injector drive laser system for the Shanghai high-repetition-rate XFEL and Extreme light facility (SHINE). A fiber chirped pule amplification system is designed to produce high-repetition-rate high-energy infrared picosecond pulses and a subsequent fourth-harmonic generation system is employed to produce deep ultraviolet picosecond pulses. The latest development on key performance parameters of 1 MHz, infrared and deep ultraviolet picosecond pulses for the SHINE photo-injector drive laser system will be presented.
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