Parametric amplification or parametric conversion system of adjustable broadband laser pulse of spectral response curve

Abstract

The invention relates to a parametric amplification or parametric conversion system of an adjustable broadband laser pulse of a spectral response curve, which belongs to the field of nonlinear intense laser. The parametric amplification or parametric conversion system comprises a spatial frequency chirp transformation device, a splitting, attenuation and optical delay device, a partially reflecting mirror, a focusing cylindrical lens, a fan-shaped periodically poled crystal, a filtering device and a collimating cylindrical lens, wherein the partially reflecting mirror, the focusing cylindrical lens, the fan-shaped periodically poled crystal, the filtering device and the collimating cylindrical lens are arranged on an optical axial line in sequence, the output pump pulse of the splitting, attenuation and optical delay device enters the partially reflecting mirror from a 45-degree angle, and the installation directions of the partially reflecting mirror and the filtering device respectively form a 45-degree included angle with the output optical shaft of the spatial frequency chirp transformation device. The system of the invention not only can realize the parametric amplification or conversion for almost identical gains of all frequency components within the input signal bandwidth, but also can adjust the intensity and the position of each pump pulse according to needs, so as to change the bandwidth or the spectral property of the frequency response curve or the output pulse bandwidth. Moreover, the system has the advantages of simple structure, convenient calibration, flexible crystal selection and the like.

Description

technical field [0001] The invention relates to a broadband laser pulse parameter amplification or conversion system capable of realizing adjustable input and output spectral response curves. It is necessary to adjust the intensity and position of each pump pulse to change the spectral response curve of the parametric amplification or conversion system or the bandwidth and spectral characteristics of the output pulse, which belongs to the field of nonlinear strong laser. Background technique [0002] The parametric amplification (or parameter conversion) of broadband ultrashort laser pulses is different from that of narrowband lasers, because nonlinear crystals inevitably have dispersion effects, that is, the phase and group velocities of different frequencies of light in crystals are different. For anisotropic nonlinear crystals, the birefringence effect of the crystal can be used to compensate the difference in phase velocity caused by the dispersion effect to achieve phas...

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Problems solved by technology

[0003] These schemes have their own advantages and disadvantages. The non-collinear phase matching and wavefront tilt group velocity matching have a simple optical path structure, but their bandwidth is limited. The degenerate point phase matching method not only has a simple optical path structure, but also can obtain a larger bandwidth, but different Crystals can only be applied to specific frequencies, while multi-angle pumping phase matching and time-domain delay double-pulse pumping chirp matching can obtain the maximum bandwidth, but their structures are complex, and multi-angle pumping phase matching is due to multiple The beams intersect at the same location simultaneously, and their input power density is limited

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