Mid-infrared chirped pulse amplifying device

Abstract

The invention discloses a mid-infrared chirped pulse amplifying device. The mid-infrared chirped pulse amplifying device comprises a femtosecond laser, a synchronous narrowband picosecond laser, a beam splitter, a near-infrared pulse stretcher, a non-linear frequency converter, an optical parametric chirped pulse amplier and a mid-infrared pulse compressor. Due to the fact that grism pairs and grating pairs are matched with each other to serve as the pulse stretcher and the pulse compressor, usage of a mid-infrared pulse stretcher is avoided, residual third-order dispersion in compression pulses in the process that the grating pairs serve as the pulse stretcher and the pulse compressor is eliminated, and the mid-infrared chirped pulse amplifying device is particularly suitable for generation of mid-infrared ultra-short ultra-strong pulse lasers with the frequency lower than hundreds of femtoseconds.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a mid-infrared chirped pulse amplification device. Background technique [0002] The rapid development of ultrashort and ultraintense lasers in the past ten years has provided unprecedented experimental means and development opportunities for people to explore microscopic ultrafast phenomena and study strong field physics. The mid-infrared band is between the near-infrared band and the terahertz (THz) band, and is a very important electromagnetic radiation band. Typical mid-infrared wavelengths are 3-5 μm. The ultra-short and super-powerful mid-infrared femtosecond laser has unique and important applications in cutting-edge scientific research such as biological tissue ablation, atmospheric detection, and high-order harmonic generation; it is even more important in national security fields such as photoelectric countermeasures and advanced defense. application potential. [000...

AI Technical Summary

Problems solved by technology

[0006] Of course, by simply adjusting the grating incident angle of the grating stretcher and grating compressor, the ratio between their second-order and third-order dispersion can be changed within a certain range to reduce the residual third-order dispersion. However, this can be adjusted The amount is very small. More importantly, in order to obtain higher stretching and compression efficiency, the grating usually needs to work at an incident angle near the Littrow angle. Deviation from this angle will seriously affect the grating. Diffraction efficiency

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