Reflex multi-time amplification device based on spliced laser crystals

Abstract

The invention relates to a reflex multi-time amplification device based on spliced laser crystals. The device comprises a spliced laser crystal amplifier, a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror, a fifth reflecting mirror, a sixth reflecting mirror, a seventh reflecting mirror and a deformable lens or a splicing reflecting mirror driven by a motor, wherein each of the first reflecting mirror, the second reflecting mirror, the third reflecting mirror, the fourth reflecting mirror, the fifth reflecting mirror, the sixth reflecting mirror and the seventh reflecting mirror is provided with a mirror bracket. The device is characterized in that by the two reflecting mirrors with multiple pairs of normal lines perpendicular to one another, the distribution of an amplified light spot in a space is exchanged in a reflex direction, after reflex amplification for many times, different parts of the light spot sequentially pass through spliced small crystals in each spliced big crystal, the optical path difference caused by different incident angles is compensated by the deformable lens or the spliced reflecting mirror driven by the motor, and thus, the non-uniformity of each small spliced laser crystal of the spliced laser crystal amplifier is compensated. By the device, the optical path difference and a surface-shape error caused by different incident angles due to different times are compensated, and the time-space characteristic of the light spot can be ensured well.

Description

technical field [0001] The invention relates to a laser amplifying device, in particular to a folded multi-pass amplifying device based on laser crystal splicing. Background technique [0002] In recent years, with the continuous in-depth development of strong field science and the continuous improvement of the energy and intensity requirements of ultra-intense and ultra-short lasers, various optical amplification devices have been greatly developed. In this system, laser crystals are the core devices. To obtain high-energy and high-intensity laser pulses often requires a laser crystal with a large optical aperture and a strong pump light. However, large-sized laser crystals and high-energy-density pump light will bring some problems at the same time, including the limitation of laser crystal growth technology, the inability to obtain large enough laser crystals; The laser parasitic oscillation between the sides of the crystal, the existence of parasitic oscillation will gr...

AI Technical Summary

Problems solved by technology

However, large-sized laser crystals and high-energy-density pump light will bring some problems at the same time, including the limitation of laser crystal growth technology, the inability to obtain large enough laser crystals; The laser parasitic oscillation between the sides of the crystal, the existence of the parasitic oscillation will greatly consume the particle number density of the energy level on the laser crystal, so that the amplification efficiency of the pulse seed light of the system will be reduced, so that the output energy cannot meet the needs, which has been It has been proved by scientific researchers, see [KlausErtel, Chris Hooker, SteveJ.Hawkes, etal, OPTICS EXPRESS, 16, 8049, (2008)], so in order to obtain stronger laser pulses, it is necessary to increase the aperture of the laser crystal , while limiting the generation of parasitic oscillations

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