A laser pulse stretching method without spatio-temporal distortion

Abstract

The invention discloses a laser pulse broadening method without spatiotemporal distortion. The method first selects optical elements for pulse broadening, establishes a coordinate system, builds an optical system for laser pulse broadening, and adjusts the positional relationship between the optical elements in the system. , and then input the laser beam, and the laser beam is output after four passes in the system. The plane mirror of the system completes the conversion of the laser beam from the first pass to the second pass and the third pass to the fourth pass, and the ternary mirror completes the conversion. Conversion of the beam from the second pass to the third pass. The laser pulse broadening method without spatiotemporal distortion disclosed by the invention avoids using far-field optical elements in the laser pulse broadening process, thereby improving the signal-to-noise ratio of the laser far-field. The beam transmitted in the third pass is transmitted in anti-parallel, thus avoiding the problems of space-time distortion such as spatial chirp and angular dispersion of the broadened laser beam, and can significantly improve the quality of the output laser beam.

Description

technical field [0001] The invention belongs to the technical field of ultra-short and ultra-intensive lasers, and in particular relates to a laser pulse stretching method without spatio-temporal distortion. Background technique [0002] Chirped pulse amplification technology is currently the main method to obtain ultra-short and ultra-intense laser pulses. It first broadens the ultra-short pulse on the time scale and reduces its peak power. Pulse stretching is an important step in chirped pulse amplification technology. [0003] The existing chirped pulse amplification system usually adopts the stretching method such as figure 2 As shown, for the incident laser light with a single wavelength component, a point focus is formed on the convex mirror 24, but when the laser pulse energy is high, the convex mirror 24 is easily damaged, thereby limiting the laser flux of the method, and the existing broadening In the method, the convex mirror 24 is used as the far-field element ...

AI Technical Summary

Problems solved by technology

[0003] The existing chirped pulse amplification system usually adopts the stretching method such as figure 2 As shown, for the incident laser light with a single wavelength component, a point focus is formed on the convex mirror 24, but when the laser pulse energy is high, the convex mirror 24 is easily damaged, thereby limiting the laser flux of the method, and the existing broadening In the method, the convex mirror 24 is used as the far-field element of the optical system, and the surface distortion of the convex mirror 24 will also significantly affect the far-field signal-to-noise ratio of the laser pulse. The amount of light off-axis in the vertical direction (Y-axis direction) is large ( figure 2 The middle stretcher adopts a four-pass structure, L is the off-axis amount), the output beam will produce obvious system spherical aberration, which will introduce space-time distortion problems such as spatial chirp and angular dispersion, which will seriously affect the quality of the beam after stretching

[0004] Therefore, in order to solve the problem of spatiotemporal distortion of the output beam after laser pulse stretching and improve the quality of the laser beam, a method is urgently needed to achieve laser pulse stretching without spatiotemporal distortion

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