Research On Semiconductor Laser Superimposed Array Microlens And Fiber Coupling Technology

In order to improve the energy conversion efficiency,repetition rate and lifetime of high-power solid-state lasers,semiconductor lasers are usually used as pump sources.The requirements of high-power solid-state lasers for semiconductor lasers mainly include high power density and high brightness.For bulk solid-state lasers,high uniformity of pump source is also required.In addition,in order to improve the output power and heat management ability of the laser system,some high power solid-state lasers have also designed special amplifier configurations,such as split gain medium array amplifier,thin tube gain medium amplifier,waveguide gain dielectric amplifier,etc.These special amplifier configurations put forward special requirements for the output light field of the semiconductor laser as the pump source.In this thesis a technical scheme based on micro-lens array segmentation and optical fiber flexible transmission integration is proposed to satisfy the requirement of amplifier to the high brightness and high power density pump source,which can also be specially shaped according to the needs of the laser amplifier.The main contents of this thesis are as follows:Chapter 1st:The development of semiconductor lasers,the research status of coupling semiconductor lasers to fiber and the homogenization of laser beams by microlens arrays are introduced.On the basis of these,the research work of this paper is introduced.Chapter 2nd:The homogenization system of semiconductor laser based on microlens array is presented.The characteristics of semiconductor beams are introduced in detail,and the principle of using microlens array to segment semiconductor beams into optical fiber beams is proposed.The principle of imaging microlens array homogenization system is analyzed,and the design principle of microlens parameters is determined from the point of view of mathematical statistics.Chapter 3rd:Semiconductor beams are divided into fiber beams based on microlens array.The micro-lens array is divided into two-dimensional array by tracepro.The parameters of the micro-lens array are designed and the optimum spot is obtained by coupling the microlens array into the 500um fiber.At the same time,using the existing conditional design experiments,the scheme is verifiedChapter 4th:Based on the micro-lens array uniform semiconductor array pump coupling system.From the point of view of mathematical statistics,the parameters of the imaging microlens array are designed and simulated with tracepro,and the experiments of many specific imaging microlens arrays are designed to verify the correctness of the mathematical statistical model.Chapter 5th:Summarizes and prospects.Summarize the full text and put forward some suggestions for the next research.