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Progress in research on beam purification of solid slab lasers
Due to its small size, light weight, long life and high efficiency, solid-state laser has been widely used in industrial, medical, scientific research and other fields. Conventional round bar lasers have severe thermally induced birefringence effects and thermal lensing effects under high power pumping, making it difficult to achieve both high average power and high beam quality. In order to solve this problem, Martin et al. proposed the concept of slab laser in 1969, which significantly improved the heat dissipation performance, but the thermal effect of the gain medium still caused the wavefront distortion of the beam and reduced the beam quality. How to achieve high average power and high beam quality at the same time is always a major problem in the development of solid slab lasers.
Xu Bing, researcher of the Key Laboratory of Adaptive Optics, Institute of Optoelectronic Technology, Chinese Academy of Sciences, has long been engaged in the research of beam cleaning of solid slab lasers based on adaptive optics. Due to the special structure and working mode of solid slab laser, compared with conventional adaptive optics, the adaptive optical system of solid slab laser needs to solve the large-amplitude beam large-value low-order aberration pre-compensation, wavefront Specific problems such as slope local anomaly processing and high flexibility wavefront processing. The Xu Bing team broke through key technologies such as low-order aberration compensator, weighted optimization wavefront restoration method and general wavefront processor to achieve excellent beam quality of 1.64 times diffraction limit. Based on the above technology, more than 20 sets of adaptive optics systems have been developed, which have served the solid slat laser system developed by many domestic units, and have achieved good results, which guarantees the beam quality of the above laser system.
Related papers were published in the recent "Photoelectric Engineering".