Laser pulse stretcher and stretching method

Abstract

The invention provides a laser pulse stretcher and a stretching method, and the stretcher and the stretching method enable a laser pulse to be guided into a pair of transmission-type grating pairs which are arranged in parallel, assist a plurality of lenses in light collimation and light path folding, and achieve the stretching of the laser pulse in a time domain through the introduction of dispersion. The stretcher has the advantages of being capable of being miniaturized, easy to integrate and the like, introduced spectral phase noise is small, the stretcher has the advantage of high pulse contrast, and the stretcher is particularly suitable for the technical field of ultrafast lasers.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a laser pulse stretcher and a stretching method of a high-power laser for generating ultrahigh-power ultrashort pulses based on chirped pulse amplification technology. Background technique [0002] In the past 30 years, the laser power has continued to rise, and the focused peak power density has also increased by leaps and bounds, and the inflection point of this rapid development appeared after the picosecond and femtosecond lasers were amplified. Since the invention of the laser in 1960, the pulse width of the free-running laser has been hovering at the millisecond level, and the output of the nanosecond level can only be achieved through Q-switching technology. The emergence of mode-locking technology reduces the width of the laser pulse by 10 6 times, directly into the femtosecond scale. At the same time, new challenges have also emerged. When the pulse is as sh...

AI Technical Summary

Problems solved by technology

[0006] The stretchers mentioned above are often used in solid-state scientific research ultrafast lasers, but their bulky size is not conducive to large-scale applications such as industry

Moreover, due to the low flatness of the gold-plated reflective grating surface of the conventional Martinez stretcher and Offner stretcher, spectral phase noise will be introduced during pulse stretching, which will eventually affect the pulse contrast.

[0007] In addition, during the research and practice of the above method, the inventor of this patent also found that the above-mentioned several traditional stretchers also have the disadvantages of complex optical paths and difficulty in miniaturization.

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