Coaxial synthesizing method for coherent beam

Abstract

A coaxial combination method for coherent light beams is characterized by including the following steps: 1. a polarized light p and a polarized light s are coaxially combined into an elliptically polarized light through a polarization beam combining mirror; 2. and then the elliptically polarized light is changed into a polarized light s or p through a 1 / 4 wave plate and a 1 / 2 wave plate; and 3. the combined polarized light s or p continues to be combined with other polarized light p or s as the steps 1 and 2, thus achieving the purpose of the coaxial coherent combination of a plurality of laser beams by the adoption of a multi-level combination mode. The invention realizing the combination of a plurality of coherent laser beams is characterized by simple principle, easy realization, high combination efficiency, good beam quality, strong commonality, and the like.

Description

technical field [0001] The present invention is related to laser technology, especially a method for coaxially combining coherent beams to efficiently increase the energy of combined beams and maintain good beam quality. technical background [0002] With the gradual increase in the application of lasers in the fields of national defense, scientific research, and industrial production, the demand for laser beams with high power and high beam quality is becoming increasingly urgent. However, because various lasers are limited by different mechanisms or conditions, the improvement of their output power is always limited, and the output power of a single laser is inversely proportional to the beam quality. For example, when a solid-state laser is output at high intensity, the nonlinear effect and thermal effect of the gain medium are obviously serious, and the thermally induced birefringence and thermal lens effect will limit the further increase of the output power, and even d...

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Problems solved by technology

However, since various lasers are limited by different mechanisms or conditions, the improvement of their output power is always limited, and the output power of a single laser is inversely proportional to the beam quality

For example, when a solid-state laser is output at high intensity, the nonlinear effect and thermal effect of the gain medium are obviously serious, and the thermally induced birefringence and thermal lens effect will limit the further increase of the output power, and even damage or destroy the gain medium and the output mirror. and other components, while the beam quality degrades

Although some measures are taken to improve this situation, such as using a slab-shaped gain medium, or using traditional traveling wave amplification technology, they cannot completely get rid of the influence of thermal effects in the end, so that the output power cannot be greatly improved.

Another example: fiber laser has the advantages of compact structure, good beam quality and stable output. However, the high-power output system is still limited by the nonlinear effect of doped light, optical damage and thermal effects.

In general, it is quite difficult and expensive to significantly increase the output power of a laser

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