Automatic calibrating device for positive branch confocal unstable resonator mirror

Abstract

The automatic calibration device in the positive branch confocal unstable cavity mirror includes: a He-Ne laser, a folded mirror with a small hole structure, a scraper mirror with a small hole, a convex mirror, and a detector that detects the output beam quality of the laser. It consists of a Terman wavefront sensor, a main controller and a concave mirror with a stepping motor actuator. The structure of the invention is simple and stable, and the processing technology is easy to realize. By adjusting the concave mirror of the main control mirror, it can be corrected inside the laser resonator Compared with the existing laser intracavity automatic alignment technology, the high-energy laser beam tilt, jitter and defocus error can simplify the installation and adjustment of the control system and the control algorithm is easy to implement because it captures the main factors that affect the beam quality.

Description

technical field [0001] The invention belongs to an automatic calibration device of a laser resonant cavity mirror, and an automatic calibration device in a positive branch confocal unstable cavity mirror. Background technique [0002] The vigorous development of modern communication, the research of high-energy laser applications and the application of laser radar have put forward higher requirements on the quality of laser output beams. Therefore, continuous improvement and improvement of the quality of laser output beams is a hot spot in the world's cutting-edge technology research. [0003] Research has found that high-energy lasers can output approximate plane waves when working in an unstable cavity, and contain a small amount of high-order aberrations under the condition of removing beam tilt and defocus aberrations. Therefore, intracavity tilt and defocus aberrations are the main causes of beam quality deterioration major factor. When a high-energy laser outputs lase...

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Problems solved by technology

When a high-energy laser outputs laser light, the environment in the cavity is very harsh, there are strong airflow disturbances and other factors that affect the imbalance of optical components in the cavity, so the quality of the output beam will deteriorate, which will affect the application of the laser. Correcting all beam aberrations not only complicates the device and control algorithm, but also makes it difficult to take care of multi-order aberrations, because there is no theoretical solution to the aberrations in the laser resonator cavity and the laser output power, near-field light intensity and phase. The corresponding relationship of the distribution; in addition, if the correction of all beam quality is handed over to the external purification system, it will increase the burden on the external purification system, and it is difficult to achieve satisfactory results

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