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Progress in aberration detection of laser pointer array based on fiber coupling

The flame tube is the main component of the aero-engine combustion chamber and one of the most important heating parts of the engine. The fuel and compressed air are mixed and burned in the flame tube to convert the chemical energy of the fuel into heat. As the performance of aero-engines continues to increase, the inlet temperature of the aero-engine combustor is also increasing. To ensure stable and continuous operation of the flame tube under extreme high temperature conditions, it must be cooled and cooled by coating on the flame tube alloy material. The combination of layers and film cooling is one of the main methods currently used.

For the processing of the film hole with the thermal barrier coating flame tube, China usually adopts the method of first punching and coating, and the deposition of the coating material causes the pore size to be less random, and the long pulse laser pointer processing belt is used. The thermal barrier coating flame tube has a defect in the surface of the coating, such as splashing, ablation, and coating collapse, which seriously affects the working life of the flame tube.

In response to the above process problems, Xi'an Opto-mechanical Institute has overcome a number of core technologies, key processes and complete system integration technologies, and developed a flexible flame tube ultra-short pulse laser precision hole-making equipment based on mechanical arms and a complete set of processing technology, taking the lead in China. The invention realizes high-quality one-time hole making with the special barrier film hole of the thermal barrier coating flame tube, and fundamentally solves many technical problems, and provides a new processing method for the manufacture of the flame tube film hole with thermal barrier coating engine. Accelerating the process of China's commercial aviation engine autonomy has important supporting significance.

In recent years, fiber laser coherent synthesis technology has broken through the limitation of the maximum output power of a single fiber, and can achieve high brightness and high beam quality laser output, which is one of the important development directions of high energy laser systems in the future.

As a typical representative of multi-beam coherent synthesis, laser pointer array technology has also been continuously developed. In the future, fiber laser array technology needs to face the challenge of long-distance transmission applications under actual atmospheric turbulence, correcting the total aberrations of the fiber laser array during atmospheric transmission, but the wavefront sensing has been maturely applied in the traditional adaptive optics system. The method cannot be directly applied to the fiber laser coherent synthesis system, so it is necessary to develop a new wavefront laser pointer that can be closely integrated with the fiber laser array.

Recently, Li Xinyang, a researcher at the Institute of Optoelectronic Technology, Institute of Optoelectronic Technology, Chinese Academy of Sciences, proposed a fiber-optic laser array aberration detection method based on fiber coupling. The method uses numerical simulation to simulate the process of recovering turbulence aberrations. Experiment with a 7-element adaptive fiber collimator (AFOC) array to recover static aberrations.

The simulation results show that the proposed method can effectively recover the turbulent distortion wavefront, and there are different optimal restoration orders for the hexagonal arrays with different unit numbers. This technology is expected to be further applied in systems such as laser array atmospheric transmission and turbulence correction.

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