Study On Key Technologies Of High Efficiency Repetition Frequency Large Energy Pulse Laser

High-energy repetition frequency pulse lasers have important applications in basic scientific,industrial processing and national defense fields.Since this kind of laser is operated with re-frequency,it has higher requirements for thermal management than a single pulse operation laser.Compared with continuous lasers,there are higher requirements for control of spontaneous emission light amplification.Under the conditions of meeting the above two main requirements,how to improve the conversion efficiency of the laser and realize the compactness of the laser are of great significance to adapt to the high-demand application scenarios.This paper studies the key technical and physical issues of high-efficiency and compact high energy re-frequency pulse lasers.The focus is on the theoretical analysis,design,and experimental research on the thermal management of the laser and ASE suppression and the optical configuration of the laser.The main research contents and innovation points are as follows:1.The research background and research status of high-energy re-pulsed lasers are expounded.A qualitative analysis of the key issues affecting the efficiency and compactness of high-energy pulsed lasers was made to clarify the technical difficulties and basic design ideas of such lasers.2.The design verification was carried out for the thermal management of different use respectively.For the cooling uniformity of the water-cooled laser,the edge heat balance and thermal effect control,astigmatism control and pointing control of the active mirror amplifier,some innovative methods were proposed,which was verified by experiments and achieved good results.A passive energy storage type temperature control method was proposed,a solid-liquid phase change module was designed,and experimental verification was carried out.The experimental results are in line with expectations,which open a way for laser thermal management.3.Aiming at the problem of medium ASE suppression,an edge processing method of cutting the edge of the medium into a trapezoidal polyhedron is proposed,which solved the problem of ASE light extraction in the case of high refractive index crystal without refractive index matching glue,realized efficient energy storage of the laser medium,and eliminated the heat generation jumping at the edge of the medium to achieve the edge heat balance and ASE integrated control.4.Ten Joule class laser based on Nd:YAG crystal medium was designed.The design of a laser system based on a single-line 15J combined 100J,100Hz,laser was designed.The key parameters are analyzed and calculated.The temperature change with the running time of the medium with phase change thermal control was obtained which provided a reference for the deepening design of the laser.A single aperture gas cooled laser was designed and the key parameters were calculated.The unit performance testing and system on line debugging of the ten Joule high frequency laser were carried out.The output of 10J-50Hz was realized the first time in China.