Double-pass laser amplification system and method based on coaxially-disposed independent double-cell phase-conjugated mirror

Abstract

The invention discloses a double-pass laser amplification system and method based on a coaxially-disposed independent double-cell phase-conjugated mirror. The system comprises a laser device, a first polarizer, a first lambda / 2 wave plate, a first Faraday magneto-optical rotator, a second polarizer, a laser amplifier, a third polarizer, a first 45-degree reflecting mirror, a second 45-degree reflecting mirror, a second lambda / 2 wave plate, a third 45-degree reflecting mirror, a fourth 45-degree reflecting mirror, a fourth polarizer, a third lambda / 2 wave plate, a second Faraday magneto-optical rotator, a fifth polarizer, a 90-degree optical rotator, a first lambda / 4 wave plate, a stimulated brillouin scattering amplification cell, a second lambda / 4 wave plate, a sixth polarizer, a positive lens and another stimulated brillouin scattering amplification cell. A delay reflecting mirror is arranged in front of the second Faraday magneto-optical rotator, a seventh polarizer is arranged behind the fourth polarizer, and an eighth polarizer is arranged behind the third polarizer. On the premise of guaranteeing quality of laser beams, output power of laser can be greatly increased.

Description

technical field [0001] The invention relates to a laser double-pass amplification system and method based on a coaxially placed independent double-cell phase conjugate mirror. Background technique [0002] Since stimulated Brillouin scattering has been proven to correct laser wavefront distortion, it has been continuously used as a phase conjugate mirror to improve the quality of laser beams. So far, phase conjugate mirrors based on stimulated Brillouin scattering have been successfully developed in various forms (solid, liquid and gas) and in various structures (single-cell structure, double-cell structure, independent double-cell structure), Among them, the load bearing capacity of the stimulated Brillouin scattering phase conjugate mirror is an important index to determine whether it can be successfully applied to the actual high-energy laser system. The double-cell structure has a higher load capacity than the single-cell structure, but its load capacity is again limite...

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Problems solved by technology

The double-cell structure has a higher load capacity than the single-cell structure, but its load capacity is again limited due to the inability to effectively control the injected power in its seed pool

The independent double cell structure was originally proposed as a device for studying stimulated Brillouin scattering for pulse compression and stimulated Brillouin scattering amplification, but the phase conjugate mirror device has not been used by people. , this is because in this type of device, the optical path of the pumping light and the return path of the stimulated Brillouin scattered light are optically isolated, so it is impossible to make it return along the original path, and it is impossible to apply the characteristics of phase conjugation, let alone realize the laser Two-pass or multi-pass amplification

[0003] Wang Yulei and others designed a phase conjugate mirror for stimulated Brillouin scattering with an independent double-cell structure (see: Wang Yulei, Lu Zhiwei, He Weiming, etc., a large energy stimulated Brillouin scattering phase conjugate mirror Research, Acta Physica Sinica, 56(2):883-888, (2007)), but due to the polarizer P 1 and P 2 Between the λ / 2 waveplate is used with P 1 and P 2 adjustment of light intensity, so from P 1 The output double-pass amplified laser is only a part of the total output, and the remaining part will be injected back into the laser, which will not only introduce losses, but also may cause damage to the laser, especially under high power conditions

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