17
2018
-
07
The Institute of Optoelectronics has made progress in the research of beam cleaning of solid Flat noodles lasers
Solid state lasers have been widely used in industries, healthcare, scientific research, and other fields due to their many advantages such as small size, light weight, long lifespan, and high efficiency. Traditional round rod lasers suffer from severe thermal birefringence and thermal lensing effects under high-power pumping, making it difficult to simultaneously achieve high average power and high beam quality. In order to solve this problem, Martin et al. put forward the concept of Flat noodles laser in 1969, which significantly improved the heat dissipation performance. However, factors such as the thermal effect of gain medium will still cause the wavefront distortion of the beam and reduce the beam quality. How to obtain high average power and high beam quality at the same time is always a major problem in the development of solid Flat noodles lasers.
Xu Bing, a researcher in the Key Laboratory of Adaptive Optics, Institute of Optoelectronics Technology, Chinese Academy of Sciences, has long been committed to the research on beam purification of solid Flat noodles lasers based on adaptive optics technology. Due to the special structure and working mode of solid Flat noodles lasers, compared with the conventional adaptive optical system, the adaptive optical system of solid Flat noodles lasers needs to solve the special problems such as the low order aberration pre compensation of the large amplitude value of the beam with large aspect ratio, the local abnormal processing of the wavefront slope, and the highly flexible wavefront processing. The Xu Bing team has broken through key technologies such as low order aberration compensator, weighted optimization wavefront restoration method, and universal wavefront processing machine, achieving excellent beam quality with a diffraction limit of 1.64 times. Based on the above technologies, more than 20 sets of adaptive optical systems have been developed, which have served the solid Flat noodles laser systems developed by many domestic units, and achieved good results, ensuring the beam quality of the above laser systems.
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