Apparatus for improving light beam quality of solid laser by using in-chamber adaptive optical technology

Abstract

The invention relates to a device for using intracavity self-adaptive optical technique to improve the solid laser beam quality which is formed by a He-Ne laser, a variable density fading disk, a beam-amplifying system, a distorting lens, a solid laser yield medium, a matching beam-amplifying concave mirror, a beam splitter, an output coupling mirror, a Hageman wave front sensor, a power meter, ahigh pressure amplifier, a high speed processor and a host computer, wherein the He-Ne laser sent light beacon is leaded into the solid laser yield medium by the concave mirror and is divided into two paths of signal by the beam splitter, one path uses the output coupling mirror to output the laser beam of the solid laser beam; the other path uses the Hageman wave front sensor to real-time probe the intracavity image differential information and uses the high speed processor to process it and obtains the corresponding voltage control signal; it adds the voltage to the deformation driver so that it can compensate the intracavity image difference of the solid laser.

Description

technical field [0001] The invention relates to an adaptive optical device, in particular to an adaptive optical device for compensating the gain aberration in a solid laser cavity and improving the quality of the light beam. Background technique [0002] The laser is one of the greatest inventions of the twentieth century. Since T. Maiman invented the ruby ​​laser in 1960, laser science and laser technology have developed rapidly. Laser technology has had a huge impact on the development of traditional disciplines and technologies. Related industries with laser technology as the core have become an important driving force in the era of knowledge economy and information era. Laser technology will play a role in national economic construction, medical care and scientific research. The irreplaceable key role is a strategic, overall and driving strategic high technology. [0003] Lasers can be divided into solid, gas, liquid, chemical and free electron lasers according to the...

AI Technical Summary

Problems solved by technology

When applying solid-state lasers, people expect to obtain high-quality single transverse mode oscillation and make the solid-state laser operate stably at high average power, but to achieve such a goal, the difficulty encountered is how to eliminate the high pump power generation. The thermal distortion effect generated by the thermal load accumulated in the gain medium, only by eliminating the thermal distortion effect in the gain medium, can the solid-state laser obtain high output power and good beam quality

The thermally induced birefringence caused by thermal distortion and the thermal lens effect in the gain medium will seriously affect the light output performance of the laser. Choosing a good laser gain medium can reduce the thermally induced birefringence to a certain extent and improve the light output quality of the laser. However, it is difficult to fundamentally eliminate the thermal effect; the spherical aberration in the lens effect can also be effectively reduced by a well-designed resonant cavity, however, it is difficult to compensate for the aspheric aberration in the same way, and these aspheric aberrations will change with the gain medium The increase of the accumulated heat in the laser will not only reduce the efficiency of the laser, but also make it produce multi-mode oscillation

Phase conjugate mirrors and diffractive optical elements are often used to reduce the thermal distortion effect of high-power solid-state lasers. However, the disadvantages of these devices are: they will increase the complexity of the resonator, and will cause new losses, and cannot be used in a larger applicable within the power range of

However, the disadvantage of this method is that the manual control method does not use the real-time wavefront control algorithm, and the double piezoelectric deformable mirror used in the system has the advantage of large stroke, but it does not have high precision and space. The resolving power is also poor, and it seems unable to correct high-frequency high-order aberrations

so figure 1 The measurement method does not adopt the method of measuring the most important aberration factor, and the measurement optical path is relatively long

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