An automatic alignment method of the optical path of an off-axis eight-pass amplified laser system

Abstract

The invention relates to an optical path automatic collimation method of an off-axis eight-pass amplification laser system. The invention belongs to the technical field of optical path collimation. Anegative lens is pushed in and out of a light path; a far-field photoelectric detector is adopted to obtain a hole image corresponding to a corresponding small hole of a first spatial filter in the light path; planar mirrors at different positions in the light path are fed back and adjusted; the far-field collimation of the light path can be realized; meanwhile, a near-field collimation mark is pushed in and out from a reflection cavity mirror; by adjusting the plane mirrors at different positions in the light path, the near-field collimation mark coincides with the center pixel coordinate ofa light beam near-field image, the near-field automatic collimation of the light path is achieved, the method has the advantages of being high in collimation precision and convenient to operate, and an important technical guarantee can be provided for long-term stable operation of the off-axis eight-pass amplification laser system.

Description

technical field [0001] The invention belongs to the technical field of optical path alignment, and in particular relates to an optical path automatic alignment method of an off-axis eight-pass amplifying laser system. Background technique [0002] Multi-pass amplification technology has been widely used in the energy amplification process of laser pulses, which greatly simplifies the structure of the amplification optical path. Patent application: an off-axis eight-pass laser amplifier (application number: 201710589818.5, application publication number: CN107196182A), and Off-axis eight-pass neodymium glass laser amplifier with high efficiency and excellent energy stability (Applied Optics, Vol.57, 2018, 8727-8732) disclosed an off-axis eight-pass amplified laser system, which can achieve high energy extraction efficiency, high energy output stability, and excellent pulse signal-to-noise ratio characteristics. However, when the multi-pass laser system is transferred to actu...

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Problems solved by technology

However, when the multi-pass laser system is transferred to actual operation after offline debugging, due to the influence of environmental temperature changes, mirror mechanical structure creep, foundation and support frame micro-vibration, pointing drift of injected pulse laser and other random factors, the Causes the beam to deviate from the design path, cannot pass through the hole smoothly at the filter position, and seriously affects the quality of the output beam

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